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QVAVC-SD Codec Manua..

1. 5 Press the Save button to save your changes If you don t click Save then your changes will be ignored 4 2 Starting the Decoder Enter http IPAddress where IPAddress is the IP address of the decoder 1 Select the Decoder menu on the left side of the web page 2 Click on the Start button 3 When a valid video over IP stream is being received and decoded the Video Status page will show bitrate and other statistics related to the incoming video stream 4 3 Stopping and Reconfiguring the Decoder Enter http IPAddress where IPAddress is the IP address of the decoder 1 Ifthe Decoder menu is not shown select Decoder on the left side of the web page 2 Select the Stop menu option underneath the Decoder menu You should see the following message at the top of the web page main area Decoder is Stopped 4 4 Configuring Packet Transport amp Error Correction This section explains how to configure the video transport and error correction capabilities of the QVidium H 264 SD Mini Codec and how to configure its decoder for proper operation of these error correction mechanisms Section 4 4 1 describes the configuration of the decoder s network transport and Section 4 4 2 describes the ARQ error correction mechanisms of the QVidium H 264 SD Mini Codec 4 4 1 Configuring the Decoder s Network Transport Within the Network Parameters section of the decoder profile select among ARQ RTP or UDP packet transport Also
2. file on a USB flash and plug flash into QVAVC SD This will reset all IP network settings File must be autorun and not autorun txt 8 3 Resetting the Password If you lose the root password and cannot gain access to your codec there are two procedures for resetting the password The simplest is to go to the QVidium web site at http www qvidium com reset click on Reset Password same the resulting autorun file to a USB flash stick and simply insert that USB flash stick into the QVAVC SD codec The autorun program will automatically run resetting the password to the default root Alternatively and to change the password for web access you must first connect via the Console RS 232 serial port to a serial terminal or a PC running a serial terminal emulator such as TeraTerm or Hyperterm Use 57 600 Baud and 8 bit data No Parity 1 Stop bit 8 N 1 and no flow control You may need to use a Null modem cable since the QVAVC codec like a PC is a DCE Data Communications Equipment There is no login prompt Once connected you connect directly to a Borne shell 28 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Now that you have access the console type passwd and follow the prompts to temporarily change the password Next please type rm flash qvidium httpd conf to remove the password from the web server configuration You can then type
3. Parts and labor 1 year 45 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 6 Appendix F Product Warranty Terms and Conditions 1 Warranty Statement Thank you for purchasing a QVidium product All QVidium products come with a one year limited warranty against defects in material and workmanship during the warranty period If a product proves to be defective in material or workmanship during the warranty period QVidium will at its sole option repair or replace the product with a similar product Replacement Product or parts may include remanufactured or refurbished parts or components The replacement unit will be covered by the balance of the time remaining on the customer s original limited warranty QVidium provides no warranty for the third party software included with the product or installed by the customer QVidium does not warrant that the operation of any product will be interrupted or error free and QVidium is not responsible for damage arising from failure to following instructions relating to the product s use 2 Warranty Conditions The warranty is valid only for the first consumer purchaser and is not transferable Proof of purchase will be required for any limited warranty The warranty does not cover 1 any product on which the serial number has been defaced modified or removed or 2 Damage deterioration or malfunction resulting from a Accident misuse n
4. Ref Indicator Description 1 VID Video Glows green with active video input video sync detected 2 PWR Power Glows green when the power is connected and unit is on Ref Port Description 3 USB 2 USB 2 0 Ports external storage or networking interfaces 4 Console RS 232 Console Interface via DB 9 Connector 5 LAN LAN1 and LAN2 10 100 Base TX Ethernet Ports 8 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Rear View Video and Audio I O Connectors amp RS 232 Port 12 18W Connectors are listed left to right top to bottom Ref Component Description 1 DC Power Regulated DC power input 6 18 VDC 1 0 0 5 A 2 Audio Input Analog audio L R stereo inputs stereo mini phono 3 CVBS Input Composite PAL or NTSC video input BNC connector 4 S Video Input S Video Y C PAL or NTSC video input mini DIN 5 Audio Output Analog audio L R stereo outputs stereo mini phono 6 CVBS Output Composite PAL or NTSC video output BNC connector 7 S Video Output S Video Y C PAL or NTSC video output mini DIN Note Serial numbers not shown are located on bottom between BNC connectors Important Safety Information e CAUTION The QVAVC SD Codec coniains an internal 3V Lithium battery RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE USE ONLY PANASONIC CR2032 20MM COIN TYPE BATTERY OR EQUIVALENT DISPOSE OF USED BATTERIES ACCORDING TO THE
5. and type cmd Clear the ARP cache by typing arp d and hit Enter Try pinging the system by typing ping 192 168 1 23 Oo N O WO If all else fails you can reset the network settings by going to http www qvidium com reset Then copy the file autorun to a USB flash stick and plugging it into your codec The autorun file must be saved directly not first converted to a text file It should not be saved as autorun txt On Internet Explorer use the Save Target As command and select All Files for the File Type Then plug the flash stick into the QVAVC HD It will then reset all the network settings back to the defaults 192 168 1 23 Cannot get encoder to send IP packets 1 Check that a valid video signal is connected to the video Input you have configured Use the Encoder Profile page to select among Composite and S Video inputs Make certain that you Saved the profile and afterwards hit the Start menu item 33 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 2 Make certain that device is powered on and connected to your network 3 Check that green LAN light in front is lit and link light at RJ 45 port is on 4 Make certain that you have entered the correct IP address for the destination under Encoder Profile and the correct gateway under Network Configure if the receiver is on another subnet 5 Try pinging the destination s
6. communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense 47 of 47 Copyright 2009 2010 QVidium Technologies Inc
7. eee 30 92 HEMCOGING toa File nsere a a i na a 30 9 3 Pl ying Video Froma File csesiiuonsennnrannin eo a isan 31 10 Known Problems er eeunconneoteienire iorn enai aewndeiaadessteleys 32 11 Troubleshooting amp Support 0nosooooeooseonosesssesoseesosessesesesresesessesesesreseses 33 11 1 Troubleshooting Common ProblemS s sssssessesessesesesessesessesesrseesesessese 33 172 SUpport a E E E E E EEA TE 35 2 N e S o AE EEE E AEE E E hina ec msaas Meee 36 12 1 Appendix A Encoder Configuration Parameters ccccseseeseeeetees 36 12 2 Appendix B Decoder Configuration Parameters ccceeeeeseeeeeeees 39 12 3 Appendix C H 264 SD Mini Codec Bitrate Limits 0 0 eee 42 12 4 Appendix D Hints for Minimizing Bitrates 00 0 0 ee eeceseeseereeeeeeeeeeeees 43 2 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 5 Appendix E Technical Specifications cccceeseeseceteesseeeeeeeeseeeeees 44 12 6 Appendix F Product Warranty Terms and Conditions cceeeee 46 12 7 Appendix G FOC Notice 00 0 0 ccc cccccsecscssecseesecseeeecssesesssessessessesesenaees 47 3 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 Introduction Congratulations on purchasing the QVidium H 264 SD Mini Codec LANI LAN2 QVidium H 264 SD Mini Codec Front View
8. encoder to decoder to less than 600 ms Video Filtering You can select this feature to add a special filter to the input video that helps reduce noise and thereby improve compression efficiency as well as clean up the picture Network Parameters The fields below relate to Ethernet IP video transport settings IP Transport This selects the type of video IP packet encapsulation and error correction used by the codec in generating a Video IP stream All packetized video transport mechanisms encapsulate a multiplexed constant bit rate MPEG 2 transport stream 37 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec e ARQ uses QVidium s patented error correction mechanism based on a time constrained selective packet retransmission algorithm in place of FEC It also encapsulates the video as per COP3 2 without the FEC and RFC 2733 However it relies upon an upstream channel on UDP port 7020 e RTP disables all error correction mechanisms but still encapsulates the MPEG 2 multiplexed data according to RFC2733 e UDP is similar to the RTP transport above but does not add the RTP header to the UDP packets Instead it simply encapsulates the MPEG 2 transport stream data directly into the UDP IP packet payload Destination IP Address or Hostname This specifies the IP address or Hostname for the Video IP stream UDP Port This specifies the UDP port number P base 10 for t
9. MPEG1 Layer2 Video Resolution CIF Audio Sampling Rate 32000 43 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 5 Appendix E Technical Specifications Specifications Network Interface 2 IEEE 802 3 100 10 Base TX Ethernet RJ 45 IP Network Stream Conditioning amp Error Correction EC QVidium patented ARQ error correction QVidium packet pacing optional Network Protocols IP Encapsulation RTP UDP IP and UDP IP IETF DiffServ and IEEE TOS compliance IGMP v 2 Multicast SNMP v 2 traps optional DHCP Audio Video Interfaces 1 S Video Y C video input 4 pin mini DIN connector 1 Composite video input BNC connector 1 Unbalanced left amp right stereo audio input Mini phono connector 1 S Video Y C video output 4 pin mini DIN connector 1 Composite video output BNC connector 1 Unbalanced left amp right stereo audio output Mini phono connector Transport Stream Bitrate Audio amp Video Audio Video 128 Kbps to 19 0 Mbps encode decode or transcode MPEG 1 Layer ll audio encoding ISO IEC 11172 3 Layer 2 standards compliant MPEG2 and MPEG4 AAC audio encoding Stereo bit rates 56 64 128 192 256 amp 384 Kbps Sampling rates 32 KHz 44 1 KHz and 48 KHz Transcoding MPEG1Layer2 lt gt MPEG4AAC lt MPEG2AAC 4 2 0 MPEG 2 MP ML encoding ISO IEC 13818 2 standards compliant 4 2 0 H 264 MPEG 4 AVC High Profile Adva
10. Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 5 Transcode Option The QVidium H 264 SD Mini Codec can operate as a transcoder and convert in real time a live video stream from one video encoding format to another change the video stream bit rate scale down the video resolution and change the audio encoding format and audio bitrate In order to enable transcoding you must obtain a Transcoding License Key from QVidium Technologies Inc or one of its authorized resellers and enter that License Key in the License Transcode page As a transcoder the QVAVC SD can input a video stream from either IP Ethernet interface and output the transcoded stream to an IP Ethernet network port The configuration profile includes 5 configuration panels for setting up the transcoder Transcode Network In ARQ In Server and Network Out The Transcode configuration panel shown below allows you to set the input and output interfaces output video bitrate format and resolution and the audio encoding format The QVAVC SD automatically detects the characteristics of the incoming video stream You can then select the new characteristics for the converted output video stream You can select among MPEG2 and H 264 output formats If selecting H 264 MPEG4 AVC you can also select the MPEG4 Profile and Level The transcoder also allows you to scale down the output resolution or select auto to preserve the input resolution La
11. addition to the de jitter packet buffer you can specify the size in milliseconds of the decoder s low level video data buffer In contrast to the de jitter buffer this video input buffer always exists even when error correction is disabled It buffers out variations due to both network induced jitter and operating system jitter to insure that the decoder never runs out of video or audio data despite variations in CPU processing and packet arrival times 4 4 2 ARQ Automatic Retransmission Request Automatic Retransmission Request ARQ tried to recover any packets lost during transport to the decoder by adding a small amount of delay at the decoder during which time the decoder would have time to detect and request any missing packets The size of this delay should also include adequate time for the missing packet to be received and inserted into the play out queue so that the video stream can continue to flow smoothly and unimpeded to the MPEG decoder To enable ARQ you must first select ARQ transport from the Profile dialog Also ARQ transport must be enabled at the encoder With ARQ selected and the decoder started the decoder will watch for gaps in the RTP sequence numbers from the output of the jitter buffer When it detects missing packets it sends retransmission requests to the encoder so that the encoder can quickly resend any missing packets Incoming retransmitted ARQ packets bypass the network de jitter queue and find their correc
12. as an MP4 Apple Quicktime output format The m option in this example specified the MP4 format but you can simply leave off the m parameter to use the default MPEG 2 TS format This command example uses the default parameters of 8Mb s for the H264 video bitrate and 128Mb sec for the audio bitrate encoding the audio using MPEG4 AAC with a 48KHz audio sampling rate To encode using a different video bitrate or to set other encoding parameters use the h option as described above to first find the options you are interested in and then add them to the command line using the above command line as an example to start with By default starting qvplayer from the command line runs it in the foreground From this foreground mode you can interactively set certain parameters such as changing the video encoding bitrate Typing help gives you a list of the interactive commands Type quit to stop the encoding 9 3 Playing Video From a File To decode and play out a stored file cd to the external media directory such as cd media sdal1 and type qvidium qvplayer I fil O video f lt filename gt Where lt filename gt is the file name referenced to the current directory For example if the file on a USB Flash stick is called test mp4 then use test mp4 as the filename qvidium qvplayer I fil O video f test mp4 The decoder knows to automatically set the format type the resolution the bitrate and all other relevant encoding
13. authentication to enter the web browser or to log in using Telnet The factory preset username is root and the password is also root Please enter these settings when prompted to access the system 4 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 2 Click on Configure under the Network menu on the left You should see a web page similar to the following network configuration web page Qdidium System Name QVAVC System Encoder Decoder Configure LAN 1 Transcode Management You can get IP settings assigned automatically if your network supports this Netwo rk capability Otherwise you need to enter the appropriate static IP settings LAN2 obtain an IP Address automatically DHCP Multicast r use the following IP Address Ping Config Bi IP Address 192 168 123 E r reaR Subnet mask 255 255 255 0 Default gateway 192 168 1 1 Ping Traceroute Obtain DNS server address automatically DHCP r use the following DNS server addresses Messages Preferred DNS server Alternate DNS server 2004 2009 QVidium Technologies Inc All Rights Reserved 3 Change settings as desired and click Apply 4 If you change the IP address you will need to change the URL in the web browser to point to the new address after clicking on Apply The Network Configure panel allows you to
14. can be either Composite or S Video The QVAVC codec will automatically detect and adjust for the input video resolution and format PAL vs NTSC However you can use the advanced encoding parameters Section 2 4 to scale down the video input resolution For Video Bit Rate enter the desired peak video encoding bit rate in bits per second To optimize IP network efficiency the encoder outputs a variable bit rate video stream VBR Therefore the encoder will use this bit rate number as an upper limit on video data bursts In general the video rate may be less than this rate depending upon video content To calculate the maximum peak IP data rate you must add to this video bit rate the audio bitrate plus any transport stream multiplexing and network packetization overhead usually between 5 and 10 Note Be aware that the user interface will not warn you if you try to enter a bit rate beyond the operating limits of the codec For more details on the range of MPEG encoding bit rates please see Appendix C Section 12 3 For more information on the various video parameters Frame Rate Encoding Format Resolution etc please see Appendix A Section 12 1 You can select either MPEG2 or MPEG4 AVC H 264 Video Encoding 10 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Qdidium System Name QVAVC gt System Encoder Profile License vEncoder 1 Press here for Help Pro
15. etc init d rc httpd restart to restart the web server with this new password 8 4 Re installing the Application Software If for some reason the QVAVC SD codec becomes completely unresponsive or you suspect that as a result of a failed update procedure the application memory had somehow become corrupted you can completely reinstall the application software with the following procedure The Linux Kernel is loaded into a separate area of memory and is unlikely to become corrupted so if the system does not respond to this procedure you may have a hardware problem and you should consult a QVidium technical expert Application Memory Reload Procedure 1 Go to http www qvidium com qvavc and download and save the qvave XX pkg file to a USB flash stick This file is about 9 Mbytes XX is the version number of the application software 2 Go to http Awww qvidium com reset click on Reset Software and download and save the resulting autorun file to the same USB flash stick 3 Insert the flash stick and wait about one minute Then power cycle the codec 29 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Encoding amp Decoding to from Files The QVAVC SD codec has a USB interface that allows you to connect a USB Flash stick or an external disk drive or other external memory device to the codec You can encode a video stream directly to a file on this storage device an
16. in the delivery of data to the decoder If you notice color loss audio clicks or pauses or if the decoded video occasionally freezes or loses lip sync especially over long network distances increasing this value may help The default value should be 300ms but for operation over a WAN we would suggest increasing this value to 500ms or larger Increasing this value will increase overall latency so you should minimize this value to minimize latency 39 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Out of Order buffer When in ARQ mode the decoder includes an optional additional buffer in addition to the Jitter Buffer that reorders incoming packets in case the network is causing some of the packets in the incoming video stream to arrive out of order This buffer will re order any packets within it to be output in the order of the RTP sequence number To enable this feature you must specify a buffer size in terms of the number of packets this buffer must hold until any packets are output to the decoder This feature is most useful if you choose to use Network Bonding on the decoder which causes the outgoing video stream to be interleaved between the two Ethernet ports In this case varying network delays may cause packets to arrive out of sequence which this feature helps to fix Detect video break This feature only works for Network input It monitors the PCR timestamps in th
17. opens a panel that allows you to specify the name of a file to store configuration information To configure another codec with the same parameters just point the browser to the second Codec that you want to configure You can then click on Import to automatically configure that second codec specifying the file you had just used to save the configuration of the first codec Default will reset the configuration settings for the Encoder Decoder or Transcoder depending upon which Default menu you select to their factory default settings This will allow you to reset the configuration settings to a known good state Clicking on Default will bring up a confirmation dialog box to prevent accidental resetting of the configuration Default can be helpful if you have trouble getting the encoder to work properly or cannot remember the correct settings you can click on Default to restore the encoder configuration with the factory default profile You may find it useful to use a USB flash memory stick to store these configuration profiles All configurations a stored as Unix text files If you have a text editor such as Notepad which has a Unix editing mode you have the option of editing an encoder configuration profile manually All parameters are stored in the form of multiple lines of Paramer Value lt LF gt 26 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec T System Management T
18. parameters 31 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 10 The following problems are currently known to exist Known Problems Encoder 1 2 3 Only outputs VBR variable bit rate CBR constant bit rate is not implemented Closed Captioning CC is only partially implemented for SD MPEG2 video The encoder cannot pass CC data for HD or H 264 video Setting the number of Audio Channels to 1 may cause the encoder to unexpectedly halt Dolby AC3 encoding only available upon special request Cannot use Encoder 1 and Encoder 2 simultaneously at full 720x480 resolution If using Encoder 1 and Encoder 2 simultaneously you must set the resolution of one of the encoders to a lower resolution If using Encoder 1 and Encoder 2 simultaneously you must make certain to select the same video input for both Encoder 1 and Encoder 2 Decoder PON OT Bons Decoder will not scale incoming video Decoder will not accept CIF or SIF resolution video Maximum ARQ receive bitrate is only 4 5 Mbps Dolby AC3 decoding only available upon special request Closed Captioning is not supported May freeze if incoming video bitrate is less than 1 Mbps A break in the video input can cause the decoder to get into a bad state loses color or sync if Detect Video Break is not enabled The decoder can lose color or sync when the jitter in the input exceeds
19. specify the UDP port number The Multicast Address specifies the IP multicast address if any to listen to for the Video IP stream If expecting a unicast video IP 21 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec stream leave this field blank The decoder interprets the video and audio signals as UDP IP packets in all cases regardless of the type of packet transport you select Specifying UDP treats the packet payload as raw MPEG 2 Transport Stream data All the other transport types will assume that the incoming packets have an RTP header at the start of the payload as per IETF RFC 2733 and related standards The network interface to the decoder includes QVidium s patented synchronized network de jitter buffering mechanism In the decode interface you may specify a delay for this de jitter buffer in milliseconds When using ARQ network transport mode the de jitter buffer holds the specified number of milliseconds of packets to give the decoder ample time to account for random delays and to allow the decoder to correct packet ordering The decoder uses RTP sequence numbers of incoming packets to insert incoming packets into their proper place in the de jitter buffer before releasing those packets into the MPEG decoder The de jitter buffer also uses the RTP timestamp to synchronize the decoder s network clock with the video source to adjust the de jitter buffer hold time In
20. subnet as the computer you plan to connect to Either use a cross over Ethernet cable to connect directly to the computer or connect through the same switch as your computer 4 Use QVidium s CodecManager application to find IP address of system and to confirm that Codec is online You can download CodecManager from QVidium s Download page http www qvidium com click on Downloads and scroll down to the QVidium Codec Management Software section Download and install the file QVidiumCodecManager X msi X is the current version number If that fails to locate your Codec then try the other LAN port If still not seeing the code then continue to step 5 NOTE CodecManager requires that any intermediate switches or other network equipment between your PC and the QVAVC Codec must pass Ethernet Broadcast packets If not then you can try using a cross over Ethernet cable and connecting the QVAVC codec directly to the PC If CodecManager still does not appear to find the QVAVC Codec even after selecting the correct Network Interface if not grayed out and clicking on the Discover button and you are certain that the switch passes Ethernet broadcast packets then try the other LAN port By default the QVAVC codec will output broadcast Ethernet packets back to CodecManager on LAN1 However these multicast discover packets may go out on LAN2 if selected as the multicast interface Open a shell window On Windows select Start Run
21. the Encode and Decode sides to reset all your profile settings to their factory default values 3 Verify that the Destination IP address and port specified on the encoder match their configured values on the decoder For unicast leave the multicast address blank on the decoder For Multicast make certain that you have specified the same multicast address on the decoder as well as on the encoder If multicasting through a router make certain that the router supports IGMP v2 and that it is enabled 11 2 Support We have set up a special support page for our QVAVC line of products at http www qvidium com qvavc Please take advantage of this web page for the latest firmware and application software updates the latest Changes document that describes any changes and new features and for other tips and pointers for optimal use of your new codec For specific technical help we kindly ask that you first contact the reseller or distributor from whom you purchased your QVidium product If you still require further assistance or you purchased your product directly from QVidium please contact QVidium Technologies Inc by either phone or e mail at Phone 858 792 6407 Phone Support Hours Monday Friday 9 00 am to 5 00 pm PST E mail support qvidium com E mail response time within 24 hours Technical support is limited to the basic functionality found in the Web user interface and to standard network applications For example we ca
22. will allow the encoder to pass certain data on Line 21 into the video stream However even when enabled the QVAVC may not produce compatible Closed Captioned video even for SD MPEG2 video It has only been tested to work with VLC We recommend disabling this option Low Delay This parameter enables a low latency mode that will generally reduce the total end to end latency to between second and one second Audio Channels Normally this is set to two for stereo audio encoding For low bitrate operation you can set this to one for monaural audio and reduce the audio bitrate Warning Please read Appendix A for precautions when setting monaural or low bitrate audio Video Filtering Enabling Video Filtering applies a special pre filter to the video input allowing more efficient video encoding 13 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Qdidium System License vEncoder 1 Press here for Help Profile Epor Basic Export Advanced Default Encoding Output Start Volume paea ce w PMT PID e Bitrate Caption CC ham e m Low Deay Delay No pam Sn Audio Channels 2 Monitor PCR PID Clear Stats video Filtering on ix usually Video PID Diagnostics video Frame Rate Fu Network Show Log Video PESONN E TS pkts IP pkt 7 Clear Log video Aspect Ratio 43 v Use Paang Oves no ara Number P frames auto v
23. 1 1 Overview The H 264 SD Mini Codec can encode decode or transcode standard or high definition video using either MPEG2 main profile or MPEG4 AVC Part 10 H 264 High Profile Level 4 1 compression and to interface a video feed from a wide range of video standards and connections for transport over nearly any IP network The H 264 SD Mini Codec includes QVidium s patented advanced ARQ Error Correction and clock synchronization With these advanced Quality of Service QoS features the H 264 SD Mini Codec can send video over nearly any network and across the world including wireless connections and the public Internet with unsurpassed video transport quality and state of the art video compression for minimizing bandwidth 1 2 Network Setup The H 264 SD Mini Codec comes with a factory preset IP address of 192 168 1 23 and Netmask of 255 255 255 0 You can download and run our CodecManager application to determine or change the IP settings even when the IP address has been reset to an unknown address Please refer to Section 8 of this manual for configuration using the CodecManager application The H 264 SD Mini Codec can also be reconfigured through a web browser when you know the IP address Follow the steps below to reconfigure the network settings through a web browser on a computer connected to the same subnet as the Codec 1 Point your web browser to http 192 168 1 23 NOTE The H 264 SD Mini Codec requires user
24. 3 3 Dynamically Changing the Video Encoding Bitrate 0 eee eeeeees 17 3 4 Configuring the Encoder for RTSP and Server Mode c csceseee 18 4 Decoder Configuration and Operation c ccc cece eseeeeeeteeseeeeneeaees 19 4 1 Decoding Profile and Web Interface cscccsssscstscstessrerersesssenensenss 19 42 Starting the Decoder ysiisiscciassayscssstevedbassascedi renine Kae a Eiee aE a EEEE 21 4 3 Stopping and Reconfiguring the Decoder ee eeceseeeteeseeeteeeeeeeeeeeees 21 4 4 Configuring Packet Transport amp Error Correction cc ceeeeseeeeneeeeeee 21 5 Transcode ODUON sssii23tt oF iaccc tial acreead oacennoqesten eaate ada peioteemaRe 24 6 Importing Exporting amp Resetting Profiles eeeeeneeeees 26 7 System MAN AGSINGIN iss cis cttsch eeu ee ecg ate eial este a osetia lente 27 8 Codec Manager amp System Resets cccccccccccseeseseeeeeseeseeeeseeeeeeeees 28 Gel Codec Manage ensriu taoenna ennaa E R E 28 8 2 Resetting the Network Parameters ssessesesesessesessssesesersesesseseseseesesessese 28 8 3 Resetting the Password eseseesesseseessssessessesrosessoseesossessessesrosessessessssesres 28 8 4 Re installing the Application Software cece ceccsceeseeeeeeseeeteesseeseenseees 29 9 Encoding amp Decoding to from FileS 0 cece cceeeceeeeseeeeeeeeeseeeeneeaees 30 9 1 Mounting and Un mounting an External Storage Device
25. EG 2 video encoding However we provide the option to select MPEG 2 video encoding for backward compatibility with other devices Video Format The QVAVC SD Codec automatically senses and selects the correct video input format NTSC or PAL along with the correct resolution NTSC captures interlaced video at 29 97 frames per second while PAL captures interlaced video at 25 frames per second Thus Video Format is not listed in the user interface SD Only Video Resolution NTSC and PAL The video resolution for Standard Definition video D 1 resolution is 720x480 pixels for NTSC resolution 480i and 720x576 pixels for PAL video format 576i This is the resolution commonly used for DVDs and Standard Definition broadcasting When you need to encode the video at lower bitrates the H 264 SD Mini Codec allows you to select lower CIF resolution 352x240 for NTSC and 352x288 for PAL Video Aspect Ratio 4 3 or 16 9 Standard Definition NTSC video has a 4 3 aspect ratio This is the default setting However many new HD Camcorders and video mixing equipment have NTSC composite outputs Setting the Aspect Ratio to 16 9 sets bits in the MPEG elementary stream that tell an MPEG decoder to decode the incoming video stream with this aspect ratio However it does not change the encoding resolution Video Input This selects between s video and composite video inputs Low Delay This mode minimizes internal buffering to reduce the end to end delay
26. INSTRUCTIONS 9 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 2 Encoder Configuration The encoder is configured and operated from the web browser This section explains how to configure the Codec s encoding parameters 2 1 Configuring the Encoder Overview 1 Enter http IPAddress where IPAddress is the IP address of the QVidium H 264 SD Mini Codec The default address is http 192 168 1 23 2 Click on Profile under Encoder from the menu on the left The Encoder Profile interface should display in the main area to the right of the menu system as shown in Figure 1 3 Enter the destination IP address and UDP port number encode Video Bit Rate in bps and modify the other audio and video parameters such as Video Input and Audio Bitrate in Kbps to suit your needs as shown in Figure 1a and explained below 4 Press the Save button to save your changes None of your changes will be saved nor have any effect unless you first save them If you have any doubt about the parameters selected when running the encoder you should click on Profile after saving the parameters or starting the coder to see the current operational encoder settings 2 2 Basic Encoding Configuration As shown in Figure 1a you can select the video input source and set the video and audio encoding format and bitrates For the QVAVC SD codec the Video Input
27. P you should set this to Auto The GOP can be calculated by the formula Output Parameters PMT Video Audio and PCR PID Changing these values changes the values for the respective PIDs 14 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Network Parameters TS packets per IP packet This sets the number of 188 byte MPEG 2 transport stream packets per UDP IP output packet payload The default of 7 sets the payload to 1316 bytes which minimizes the IP packetization overhead A lower value results in a higher output packet rate Use Pacing Because the video stream is VBR variable bit rate an l Frame Key Frame may generate a large burst of IP packets Pacing adds output buffering and regulates the output packet rate to attempt to equalize the output packet rate and reduce burstiness Network Bonding and LAN1 Bonding Percent Network bonding is a special feature designed for broadband wireless and other network links where a single network link has insufficient bandwidth for the video and instead you wish to take advantage of both Ethernet ports on the codec Setting this parameter to true distributes the video load across both When the two network links are asymmetric LAN1 Bonding Percent specifies the relative distribution of Ethernet packets among the two Ethernet ports The default 50 splits the load to 50 on each Ethernet port 15 of 47 Copyright 2009 2010 QVidiu
28. QVidium TECHNOLOGIES INC H 264 SD Mini Codec Model QVAVC SD User s Manual v 8 October 25 2010 Application Firmware Version 103 2009 2010 QVidium Technologies Inc 12989 Chaparral Ridge Road San Diego CA 92130 Phone 858 792 6407 Fax 858 792 9131 User s Manual v 8 QVidium H 264 SD Mini Codec Table of Contents E Introd ction ecane a RE A Sen E N 4 MM MONI Westen es ce tacts deta E R A EN 4 12 NGWORK Set sccm tnn iiia i i a cident 4 LES E ESIE ER E R A A E 6 1 4 Passwords and Security vecisccczcut oieipbleacscspiossvancusteadi ens ashdet esviocacacunagine 7 t5 GRACIA eieschtct cheatin wectsatenesadet e chats inte cous A N E A Sas shacahane 7 1 07 Syst m Vie Weisen E aa Ee EAA EOE 8 2 Encoder Configuration cece ccecceccsceseescsceseesceeesecseeeesecaeeaeecaeeaeeeeneeaees 10 2 1 Configuring the Encoder OVervieW cssssssersescetsssrsenstersrctsssonenseats 10 2 2 Basic Encoding COnnGuravlo nsiccsicvensiecisevsarteaaserdereieaadaatneteraras 10 2 3 Configuring Packet Transport amp Error Correction sseessesesseseseeesesessee 11 2 4 Advanced Video Encoder Configuration ccccceseseeteeseeteeeeeeeeeeeees 13 3 Encoder Operation seciccisss sedate aes catia te se eee 16 3 1 Starting and Stopping the Encoder cee cescssessceesssseesseceseestesseesneees 16 3 2 Adjusting Encoder Audio LeVelS 0 ec eeeescseesceceeeceseeeeeseeeeesecaeeeeeneeeees 16
29. RQ encapsulates the video stream as a standard MPEG 2 Transport Stream as the payload of UDP packets with an RTP packet header as per RFC2733 It relies upon an upstream channel on UDP port 7020 e RTP disables all error correction mechanisms but still decapsulates the MPEG 2 multiplexed data according to RFC2733 e UDP is similar to the RTP transport above but expects raw UDP packets without an RTP header It expects to receive the MPEG 2 transport stream directly from the UDP payload Use this setting for interoperability with some Set Top Boxes Multicast Address This specifies the IP multicast address if any to listen to for the Video IP stream For receiving a unicast video IP stream leave this field blank UDP Port This specifies which UDP port number P base 10 to listen on for the Video IP stream Jitter Packets in incoming IP packet streams may lose their ordering or suffer variable delays during transport through an IP network The QVAVC SD Codec buffers all incoming video IP packets in a buffer and reorders RTP encapsulated packets by RTP sequence number This parameter specifies the size of this incoming packet buffer in milliseconds of delay Specify 0 here to disable this additional buffering when latency needs to be minimize Video Buffer Size This value specified in milliseconds adjusts a buffer in the video decoder that helps prevent the decoder from running out of data and losing sync due to Jitter or variability
30. To help with firewall configuration and to handle potential port conflicts the user can change the default port that ARQ uses to send upstream retransmission requests ARQ Port However you must make certain that the same ARQ port number is set in both the encoder as in the decoder Although the automatic measurement of the round trip time uses multiple measurements to take into account random network delays for some networks you might wish to specify a larger round trip value or to specify a larger number of retries in case the upstream link loses some of the retransmission request messages In automatic robust mode of ARQ operation the system automatically measures the round trip time and divides that number into your specified Target Latency to determine the number of retries to use However in Manual Mode you can force ARQ to always use a specified number or retransmission requests Note For testing ARQ error correction select ARQ transport at both the encoder and decoder and use the default ARQ parameters at the decoder receiver Please also be certain that ARQ has also been selected at the encoder Note To help avoid firewall blocking at the encoder version 103 and later of the QVidium application firmware now allow setting the ARQ port to be the same as the UDP port We therefore recommend setting the ARQ port on the encoder and decoder to be the same value as the UDP port for video traffic 23 of 47 Copyright 2009 2010 QVidium
31. Vidium products and specifically disclaim the implied warranties or conditions of merchantability satisfactory quality and fitness for a particular purpose 5 Limitation of Liability Except for the limited obligations specifically set forth in this warranty statement in no event shall QVidium or its third party suppliers be liable for direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory and whether advised of the possibilities of such damages Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above limitations and or exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state 46 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 7 Appendix G FCC Notice NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when th quipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio
32. d Trip Time fio E Auto Mode Parameters Transcode Management Target Latency ms 250 Network Max Burst Drop ms 2 jos Messages Robust Mode 1 Sends resend requests to receiver 2 Burst Drop must be less than Target Latency E 2004 2009 QYidium Technologies Inc All Rights Reserved Figure 3b Decoder profile ARQ Tab On the Network tab shown in Figure 3a enter the desired IP Transport type ARQ RTP or UDP Select ARQ to enable error correction ARQ uses RTP over UDP transport RTP adds statistics to the UDP header to help keep track of packet loss in the Status display UDP is most compatible with third party video encoders Enter the UDP port on which to receive IP video packets Enter a multicast address if receiving multicast packets otherwise leave this field blank You can also add an input Jitter Buffer specified in milliseconds to smooth variations in packet delay and to fix packet ordering problems Qvidium System Name QVAVC i System Decoder Profile Encoder Decoder Profile Import Export Default Press here for Help Network O AR Server a QVidium Video Server settings ot use Server Oves No Status IP Address or Hostname I Clear Stats Echo Port To i Stop Note Do not enable unless connecting to a QVidium video server Transcode Management Network Messages 2004 2009 QV
33. d you can also play back a saved file from this external storage device To access external storage you must connect to a command line interface in one of 3 ways 1 through the RS 232 Console port 57 6 KBaud 8 N 1 No Flow Control Null Modem cable 2 Telnet port 23 or 3 SSH port 22 For telnet or ssh log in using username root The initial password is root but you can change this from the web GUI using the System Password menu 9 1 Mounting and Un mounting an External Storage Device When you connect an NTFS or FAT formatted external storage device to the USB interface the embedded Linux 2 6 Operating System will automatically mount the file system If you wish to connect a Linux formatted Filesystem such as ext2 or ext3 you will have to manually mount the file system The initial mount point is media sdal From the command line interface first type cd media sdal1 then use 1s for a listing of the files on the storage device However if you wish to remove a mounted storage device you must first unmount it To unmount the disk or storage device you must first stop any programs that are accessing the device then you must cd away from the mounted directory such as cd You can then issue the unmount command umount media sda1 After this command successfully completes you can safely remove the external storage device and if desired insert another storage device As long as you first unmount the old sto
34. disturbing play out of the video stream Because ARQ senses actual packet loss rather than attempt to predict packet loss it can precisely and completely restore all lost packets without disturbing timing of the video play out In contrast to FEC ARQ can successfully recover lost packets regardless of the magnitude or pattern of the packet losses provided that the network connection has enough capacity to send both the original video stream and the replacement packets ARQ shares similarities with robust packet transport protocols such as TCP IP in that both use feedback to create robust network packet transport However TCP IP uses a sliding window that limits the number of packets that a source can have in transit and requires a positive acknowledgement for each window of packets This limits TCP s throughput especially over links with long latencies Furthermore under heavy loss conditions TCP IP scales back the data transmission rates and provides no concise deadlines or constraints on packet delivery times For real time video this limits the usefulness of TCP IP and makes it unacceptable for live low latency video transport In contrast with TCP IP QVidium designed its patented ARQ error correction specifically for live interactive real time video and audio signals to automatically recover nearly all lost packets with minimal latency and over nearly any link loss conditions It adds a small configurable amount of delay to the network
35. e incoming MPEG2 Transport Stream for discontinuities and unexpected values and then automatically restarts the decoder when it detects a problem Detect video break limit This parameter lets you set the minimum discontinuity time out of between 100ms and 2000ms 2 seconds If the decoder detects a break in the incoming IP stream larger than this value then it will restart the decoder to prevent the decoder from getting into a bad state ARQ Parameters The parameters below ONLY pertain to QVidium ARQ error correction They will be ignored unless ARQ is selected for IP Transport Target Latency QVidium s ARQ error correction operates through the addition of a small additional buffering delay to provide enough time to request and receive replacement for each lost packet Target Latency gives the ARQ mechanism a target value for determining the necessary ARQ delay The ARQ divides the Target Latency specified in milliseconds by the round trip time to the video encoding source to determine the number of request attempts Unless Robust Mode is enabled it sets a minimum ARQ latency of one round trip time A larger Target Latency allows the system to increase the number or repeat requests Max Burst Drop Burst packet losses are common occurrences in many IP networks and the Internet IP networks may dynamically change paths in response to load balancing link failure avoidance and for other reasons During a re route a sequence of queued pac
36. e network Maximum MPEG 2 TS bitrates MPEG 2 or H 264 15 Mbps for UDP and RTP transport 4 5 Mbps for ARQ Minimum MPEG 2 TS bitrates MPEG 2 or H 264 1 0 Mbps Warning decoding less than 1 Mbps streams may cause freezing 42 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 4 Appendix D Hints for Minimizing Bitrates Audio Notes To minimize wasted audio overhead and minimize audio bitrates you should set one of the following 1 Set the Audio Bitrate to 56 Kbps and the Sample Rate to 48 KHz Encoding MUST be AAC results in 63 Kbps or 2 Set the Audio Bitrate to 64 Kbps and the Sample Rate to 32 KHz Any audio encoding results in 84 Kbps At low bitrates we have found that MPEG1 Layer2 Audio Encoding sounds best Note setting MPEG1 Layer2 to 56 Kbps results in a total of 126 Kbps audio overhead Low Bitrate Encoder Settings Important Note Using low bitrates on the QVAVC SD is intended for operation with an Amino Set top box VLC or other third party decoder We do not support using the QVAVC SD as a decoder for video bitrates less than 1 Mbps or resolutions less than 720x480 On the Encoder menu 1 Click on Default to reset the Encoder Profile 2 Then set the following On basic tab On Advanced tab Video Bit Rate 200000 Low Delay Yes Video Encoding H264 Video Filtering On Audio Bit Rate 64000 Video Frame Rate Half Audio Encoding
37. e upper left of the Web page Note on Resetting Password If you lost the password and need to reset it you can go to http www qvidium com reset click on Reset Password copy the autorun file onto a USB flash and plug flash into QVAVC SD This will reset the root password back to root File must be saved as autorun and not autorun txt You must have physical access to the USB ports on the QVAVC SD to use this procedure 1 5 Upgrading QVidium provides firmware upgrades from time to time to add new features overcome limitations or to fix bugs QVidium would provide any upgrades as a pkg file that you can upload into the Codec via the web browser interface To perform an upgrade just follow the following steps Copy the upgrade pkg file into a convenient location on your PC Point your web browser to the Codec and click on Upgrade in the System menu oO N Click on the Browse button and locate the upgrade file Click on Upgrade and wait for the upgrade to finish DO NOT DISCONNECT FROM POWER OR INTERRUPT THIS OPERATION UNTIL IT COMPLETES 5 Click on Reboot from the system menu to reboot the Codec A 7 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 6 System View Front View Computer Interface ports and Indicators Console All indicator lights either glow green or are off
38. ec for RTSP operation to a computer running VLC for example you can use the following procedure 1 On Encoder Profile select RTSP IP Transport on the Basic tab 2 Click Save and then click Start 3 From VLC www videolan org a Select Open Network Stream from the Media menu An Open Media dialog should display b On the dialog select RTSP from the Protocol drop down list c Enter 192 168 1 23 vox mpg amp xcode 0 amp input 0 in the Address field Substitute 192 168 1 23 for the actual IP address of your codec d Click on the Play button in VLC A green screen from VLC usually means the decoder is not receiving IP packets On the decoder menu you can click Status That will tell you if you are receiving bits Also on the Encoder you can click on Status from the Encoder menu to see if the encoder is sending bits On both systems there is a Show Log menu option that may help debug the setup if it is not working 3 4 2 Server Mode QVidium also has its own Server Mode that allows a QVidium decoder device or application to remotely start a QVidium encoder and initiate a video stream On the QVAVC SD simply leave the Destination IP Address blank and Start the encoder This will cause the encoder to listen for a start packet from the decoder On a QVAVC SD Decoder click Enable under the Decoder s Server tab and enter the IP address of the QVidium encoder When you click Start on the Dec
39. ed below are subjective suggestions based on limited empirical testing The QVAVC HD codec will allow you to enter any video encoding bitrate and will attempt to produce the best video quality it can based on the video bit rate you set as an upper limit on the average peak bitrate Unless noted otherwise all bitrates below assume full NTSC 29 97 fps or PAL frame rates 25 fps Therefore the values here are only provided as a general guideline to help with estimating the expected network loading Maximum Video Encoding Bit Rates e 25 Mbps for UDP or RTP transport error correction disabled e 15 Mbps with ARQ error correction enabled Minimum Suggested Bit Rates for general content such as movies MPEG 2 Main Profile e 2 0 Mbps for Full video resolution 720x480 e 500 Kbps for CIF video resolution 352x240 e 250 Kbps for CIF video resolution at Half Frame Rate H 264 MPEG4 AVC High Profile e 1 0 Mbps for Full SD video resolution 720x480 e 250 Kbps for CIF video resolution 352x240 e 125 Kbps for CIF video resolution at Half Frame Rate Note Video quality is content dependent and the minimum bitrates suggested above may not produce acceptable video for any given application As a general rule we suggest that you use H 264 encoding for best video quality and adjust the bitrate based on your own observations to suit your needs Decode Bitrate Limits Bitrate limits related to receiving MPEG 2 Transport Stream video from th
40. eglect fire water lightning or other acts of nature unauthorized product modification or failure to follow instructions supplied with the product b Repair or attempted repair by anyone not authorized by QVidium c Damage to or loss of any programs data or removable storage media d Software or data loss occurring during repair or replacement e Any damage of the product due to shipment f Removal or installation of the product g Causes external to the product such as electric power fluctuations or failure h Use of supplies or parts not meeting QVidium s specifications i Normal wear and tear j Failure of owner to perform periodic product maintenance k which has been subjected to unusual physical or electrical stress misuse abuse power shortage or negligence or 1 Any other cause which does not relate to a product defect 3 Warranty Procedure For the duration of the warranty period QVidium will replace or repair defective products If a product is suspected of being defective the owner should contact the reseller or distributor that sold the product A representative will authorize the exchange or repair of the defective item Products must be shipped in the original or comparable packaging with shipping and insurance charges prepaid in U S currency 4 Limitation of Warranty Neither QVidium nor its third party suppliers make any other warranty or condition of any kind whether expressed or implied with respect to the Q
41. es below for more information regarding these settings Similarly the Network Out configuration panel shown below is nearly identical to the Network configuration of the Encoder so please consult the Encoder Section and Appendices for and explanation of these settings as well Qdidium System Name QVAVC System Transcode Profile License Encoder Decoder Transcode Profile Import Export Default Press here for Help Network in ARQ Server WVetwork ou Destination IP or Multicast Address frs2168 1 130 upPPort t0 ARQ Port 7020 8 Ts packets per IP packet UsePaing OYes ND Start Status Monitor Clear Stats Show Log Clear Log Stop Management Network 2004 2009 QVidium Technologies Inc All Rights Reserved Figure 4b Transcoder Profile Network Out Tab 25 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Importing Exporting amp Resetting Profiles Under the both the Encoder Decoder and Transcoder menus you will find an Import menu item an Export menu item and a Default menu item These operations provide a quick and easy means for transferring the configuration of one QVidium H 264 SD Mini Codec to another H 264 SD Mini Codec or for resetting the configuration settings to a known state From the Web browser interface clicking on Export
42. feature allows the decoder to initiate and receive a unicast stream from a QoS Proxy Server You must provide the IP address and control port for the QoS Proxy Server The decoder then sends a control packet upstream to the server when you start the decoder Use Server Select No to disable this feature Select Yes to enable operation with a QoS Proxy Server IP Address or Hostname Enter the IP address of the QoS Proxy Server to which the decoder will send a start stream message Echo Port Normally this should be left to the default UDP port 7 This port number must match the value at the QoS Proxy Server In addition you may need to configure a firewall at the server to allow ingress for packets on this port Qdidium System Encoder Decoder Press here for Hel Profile Export Server Default es QOVidium Video Server settings Start use Server Oyes No Status ee IP Address or Hostname fi Clear Stats Echo Port 7 Stop Note Do not enable unless connecting to a QVidium video server System Name QVAVC Decoder Profile Transcode Management save Network Messages 2004 2009 Q idium Technologies Inc All Rights Reserved 41 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 3 Appendix C H 264 SD Mini Codec Bitrate Limits Encode Bitrate Limits The video encoding bit rate limits specifi
43. file Epa i Advanced Export Basic Default SSS Encoding Start video Input Composite v Volume Bitrate video Bit Rate 2000000 video Encoding H264 v Status Monitor Audio Bit Rate 160000 v Clear Stats Audio Encoding MPEGI Layer2 v MPEG1 31 Layer v Show Log Audio Sampling Rate 48000 Clear Log Network Stop IP Transport UDP Destination IP or Multicast Address 225222222 Encoder 2 upp Port n a Decoder EEE Transcode ARQ Port 7020 Management gt Network Save Cancel 2004 2009 QVidium Technologies Inc All Rights Reserved Figure 1a Basic Encoder Configuration 2 3 Configuring Packet Transport amp Error Correction The QVidium H 264 SD Mini Codec features some of the most powerful and advanced error correction capabilities found in any video over IP product The QVidium H 264 SD Mini Codec implements QVidium s patented ARQ error correction and clock synchronization US Patents 7 551 647 and 7 522 528 for the more robust video transmission with the lowest delay QVidium s ARQ Automatic Retransmission Request is a dynamically adjusting feedback error correction mechanism designed specifically to enable the highest quality video transport over wireless networks and the Internet ARQ senses packet loss at the receiver and requests replacement packets from the server ARQ can provide nearly flawless reproduction of a video st
44. g es H ep Number B frames auto w a aie Oon off Encoder 2 MPEG4 Profile auto v LANI Bond Pt 59 ie Decoder MPEG4 Level Transcode BPE ised ARQ Buffers l 1024 w Management mee L_seve_ System Name QVAVC SD Encoder Profile 2004 2010 QVidium Technologies Inc All Rights Reserved Figure 1b Advanced Encoder Configuration Video Frame Rate and Resolution for SD Normally the encoder automatically detects the frame rate and resolution of the video input signal Setting these values allows you to override the original input signal to reduce the frame rate and or resolution enabling very low output encoding bitrates such as for broadband wireless connections Video Aspect Ratio This sets a bit in the video stream to tell the display device what output aspect ratio to display Number P Frames This sets the number or Predictive frames in the Group of Pictures GOP Unless you need a specific GOP you should set this to Auto Number B Frames This sets the number of Bi Directional frames in the GOP Unless you need a specific GOP you should set this to Auto The GOP can be calculated by the formula GOP P 1 B 1 Thus for all Frames GOP 1 you would set P 0 and B 0 For Baseline Profile the B parameter is ignored internally set to 0 MPEG4 Profile This sets the number of Bi Directional frames in the GOP Unless you need a specific GO
45. he H 264 SD Mini Codec includes a number of features to aid in system security and logging A Management Configuration page shown below allows you to specify the HTTP port for web access and whether to enable or disable Telnet or SSH access By default Telnet and SSH access is enabled and allows you to log in as root using the password root System Name QVAVC System Management Configuration Encoder Decoder HTTP Web Management Port currently at Port 80 status is Enabled Transcode Management Web admin port defautt 80 7 Network wes http Access Enable Disable Messages Secure Shell ssh TCP Port 22 Current status Enabled secure Shell ssh Access Enable Disable Telnet Access TCP Port 23 Current status Enabled Telnet Access Enable Disable 2004 2009 QVidium Technologies Inc All Rights Reserved Figure 4 Management Configuration web page 27 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Codec Manager amp System Resets 8 1 Codec Manager QVidium supplies an application we call CodecManager as a free download for its customers under the Downloads section of the QVidium web site at http Awww qvidium com CodecManager will detect any H 264 SD Mini Codecs and MPEG2 4 Codecs connected through Layer 2 switches over the local area network At launch CodecManager sends a Laye
46. he Video IP stream TS packets per IP packet This field allows specification of the number of 188 byte MPEG 2 Transport Stream packets per IP packet The standard MTU for Ethernet packets permits a maximum of 7 TS packets per IP packets which is the default ARQ The parameters below ONLY pertain to ARQ error correction They will be ignored when ARQ IP Transport is not selected ARQ Port By default ARQ normally sends upstream retransmission request packets on UDP port 7020 You can change this ARQ Port setting to any valid and non conflicting UDP port However you must make certain that you specify the same port number at both the encoder and the decoder 38 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 12 2 Appendix B Decoder Configuration Parameters This section explains the parameters related to the setup and operation of the MPEG Decoder the error correction algorithms and network transport configuration Network Parameters The fields below relate to Ethernet IP video transport settings IP Transport This selects the type of video IP packet decapsulation and error correction expected by the codec in receiving a Video IP stream All packetized video transport mechanisms expect to receive a multiplexed constant bit rate MPEG 2 transport stream to decapsulate and decode e ARQ uses QVidium s patented error correction mechanism for lost packet recovery A
47. idium Technologies Inc All Rights Reserved Figure 3c Decoder profile Server Tab 20 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Two other parameters Video buffer size specified in milliseconds and Detect video break can help with the robustness of the decoder in handling packet loss and network interruptions We generally recommend setting the Video buffer size to between 300 and 500 ms For low latency applications you can try setting it as low as 150 ms For maximum robustness you can increase this parameter to 1000 ms We also recommend enabling Detect video break and setting the Detect video break limit to 150 ms When the decoder detects a pause or interruption in the flow of incoming packets of this value or higher the Detect video break feature will automatically restart the decoder to help prevent it from getting into a bad state This can help if you are experiencing color loss or other decoder problems The ARQ tab shown in Figure 3b above configures the parameters for Automatic Retransmission Request ARQ Error Correction These parameters are explained in Appendix B The last panel the Server tab enables you to pull in a stream from a QVidium video server For more details on these features please consult Appendix B You should set the Use Server to No the default when not using a QVidium server and in general when receiving a stream from an encoder
48. input audio Import Export Default Presets Start Volume Ueki Bitrate Custom Controls Status Monitor Attenuate 127 Clear Stats PON Gain 25 Show Log Clear Log Stop Figure 2 Encoder audio gain and attenuation controls 16 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec The analog audio input by default accepts a maximum input voltage of about 400 MV peax Above this level the input circuitry limits any additional signal levels by clipping the digitized signal to this peak value This level is close to the standard consumer analog level of 447 MV peax and significantly less than professional peak audio voltage levels 1 737 Vpeax US and 2 192 Vpeak German In order to accommodate various consumer and professional analog audio input sources you can select from among 3 preset standard audio signal levels Consumer Professional US Professional Europe You can also manually adjust the attenuation of the audio input 3 3 Dynamically Changing the Video Encoding Bitrate Once encoding has begun you can instantaneously vary the video encoding bitrate This can be useful when connecting to wireless modems and other network connections with limited but unpredictable time varying throughput characteristics As described in this section we provide several mechanisms for dynamically adjusting the video encoding bitrate In particular this can allow a m
49. kets on a discontinued path may be dropped A burst of packets may be dropped when higher priority packets stall a lower priority buffer ARQ will notice a burst packet loss when the first packet after the loss arrives at the codec Setting the Max Burst Drop Delay in milliseconds will delay the ARQ repeat request by this amount to handle packet burst losses Robust Mode Normally the ARQ will only require that a minimum of one repeat request is sent to the video encoding source device regardless of the Target Latency However enabling Robust Mode will increase the minimum number of repeat requests to a minimum of two retries 40 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec ARQ Port By default ARQ normally sends upstream retransmission request packets on UDP port 7020 You can change this ARQ Port setting to any valid and non conflicting UDP port However you must make certain that you specify the same port number at both the encoder and the decoder We recommend changing the ARQ port on the encoder and decoder to be the same as the UDP media port This will help allow retransmission requests back upstream through a firewall into the encoder Server Mode Configuration and Operation The parameters below ONLY pertain to the operation of the QVidium H 264 SD Mini Codec with a QVidium QoS Proxy Server Leave this disabled when not connecting to a QoS Proxy Server This
50. llows you to test network connectivity by sending ping packets to an address or hostname you specify However to use a hostname in place of an IP address you must have configured at least one DNS server QQdidium System Name San Diego gt System Ping remote host Encoder Decoder ees 1p address favicumcom Management 7 Network Configure _Ping Hostname Status Ping Logging Qdvidium System Name San Diego System Ping results Encoder Decoder aa Codec PING qvidium com 69 5 14 25 56 data bytes Management 64 bytes from 69 5 14 25 icmp_seq 0 tt1 50 time 80 5 ms Network 64 bytes from 69 5 14 25 icmp_seq l tt1 51 time 94 3 ms A esad 64 bytes from 69 5 14 25 icmp seq 2 ttl 51 time 78 0 ms lt onfigure Hostname qvidium com ping statistics Status 3 packets transmitted 3 packets received 0 packet loss round trip min avg max 78 0 84 2 94 3 ms Ping Logging 6 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 4 Passwords and Security The QVidium H 264 SD Mini Codec requires a username and password to protect access to its configuration settings This includes both Web access and Telnet access The default user name is root and the default password is also initially set to root You can change the password by selecting the Password menu item under the System Menu at th
51. m Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 3 Encoder Operation This section explains how to operate the Codec as a video encoder Once the encoder has started you can also change the audio attenuation and gain settings and dynamically change the video encoding bitrate 3 1 Starting and Stopping the Encoder Enter http IPAddress where IPAddress is the IP address of the encoder 1 Select the Encoder menu on the left side of the web page 2 Select the Start menu option underneath the Encoder menu to start the encoder Likewise click on Stop to stop the encoder If the encoder is running you can edit the parameters and click on Start to restart the encoder with the new parameters There is no need to first stop the encoder since the Start command first performs a Stop operation Note If you wish to reconfigure the encoder remember to first Save any configuration changes before restarting the encoder 3 2 Adjusting Encoder Audio Levels The analog audio conditioning and digitizing circuitry includes both an audio preamplifier followed by a audio attenuation block Once the encoder has started you can dynamically vary the gain and attenuation of the audio signal that is being fed to the digitizer with the controls in Figure 2 below Qdidium System Name Encoder Systom Encoder Volume License vEncoder This only affects the analog input volume This does Profile not affect the SDI or HDMI
52. modify the static IP address parameters and DNS server settings or to have these settings automatically configured through DHCP A Hostname panel allows you to specify the host name for use in conjunction with a DNS server to assign a predetermined IP address Note on Resetting IP Address In case you change the IP address or select DHCP and cannot determine the IP address you use the QVidium application CodecManager that you can download from the Downloads page of www qvidium com Alternatively you can connect the Console serial port to log into the Linux shell and change the IP address or other settings To reset the IP settings connect a PC running a terminal emulator such we Hyperterm or TeraTerm at 57 600 Baud 8 N 1 no flow control and type ifconfig ethO lt IP address gt where lt IP address gt is replaced by the desired IP address for example ifconfig ethO 192 168 1 23 Alternatively upon power up the Codec will emit a gratuitous ARP packet from which you can determine its IP address by using a packet snifter or network monitor such as Wireshark from www wireshark org Or go to http www qvidium com reset copy the autorun file on a USB flash and plug flash into QVAVC SD This will reset all IP network settings File must be autorun and not autorun txt 5 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 3 Ping Selecting Ping a
53. nced Video Coding Part 10 NTSC 720x480 352x240 SIF resolution for encode only PAL 720x576 352x288 CIF resolution for encode only Multiplexing Format MPEG 2 Transport Stream amp MP4 MP4 for files only not for live streaming Encode Line 21 Closed Captioning Decoder does not currently decode closed captioning Transcoding H 264 or MPEG2 lt H 264 or MPEG2 Resolution downscaling Bit rate scaling Serial Interfaces 1 DB 9 RS 232 Console Interface 2 USB 2 0 Ports for video storage and plans for broadband wireless interface Configuration and Monitoring Web setup amp monitoring interface over IP network SNMP v1 amp v2c traps optional Electrical DC Power Input 6 to 26 VDC 250 750 mA 6 Watts average Auto sensing AC power adapter included Mechanical Dimensions 6 65 W x 4 5 D x 1 H Dimensions mm 169 W x 116 D x 25 H Unit Weight 0 75 Ibs 0 34 Kg Environmental Operating temperature 0 to 50 C Operating humidity 0 to 90 R H non condensing Non operating temperature 20 to 70 C Non operating humidity 0 to 95 R H non condensing 44 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec Regulatory amp Compliance e RoHS CE and FCC compliant e CE 73 23 EEC Low voltage equipment 89 336 EEC Electromagnetic compatibility e Safety IEC60950 and EN60950 e EMC EN55022 EN55024 EN6100 3 2 Warranty
54. ng rate Internal anti aliasing filters severely attenuate audio signals above a frequency of about 1 3 of the sampling rate Thus for a standard music CD rate of 44 1 KHz the maximum audio frequency that the encoder can pass is about 14 7 KHz The valid selectable audio sampling clock rates are 32 KHz 44 1 KHz and 48 KHz SD Only Video Frame Rate Full Frame Rate and fractions thereof Select Full Frame Rate for normal video This will encode the video signal at 29 97 frames per second for NTSC and 25 fps for PAL video format If you need to produce lower video bitrates and reducing the resolution is not sufficient or undesired you can use this feature to 36 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec sacrifice frame rate for lower bitrates However to use thus feature you must select MPEG 4 SP encoding and Program Stream transport Video Encoding The H 264 SD Mini Codec digitizes an analog composite or S Video signal according to the ITU R BT 656 standard performs a 4 2 2 to 4 2 0 conversion and compresses the digitized video using either the MPEG 2 video encoding standard MP ML ISOIEC 13818 2 or MPEG4 AVC H 264 high profile compression depending upon your selection We suggest that you select H 264 compression The QVAVC SD codec incorporates High Profile Level 4 0 to 4 1 MPEG4 AVC part 10 video encoding This nearly always produces better video than MP
55. nnot provide detailed command line support unless the user has sufficient experience and knowledge of Unix or the Linux operating system For Broadband Wireless 3G networking applications because of the inherent low bitrate constraints bit rate and link variability and complexities of found in Broadband Wireless 3G networks we cannot directly provide support for applications over Broadband Wireless 3G Networks In these cases we would be glad to refer you to one of our vertical marketing and system integration partners for help with your specific application 35 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 2 Appendices 12 1 Appendix A Encoder Configuration Parameters This section explains the parameters related to the analog input signals and encoding settings and how they relate to the operation of the encoder and error correction and network transport setup Video Encoding Bit Rate Average peak bit rate for Variable Bit Rate VBR video encoding The resulting transport stream bit rate is the sum of the bit rates of the video program audio program and program stream information The video encoding bit rate is specified in bits per second and can range from 128 Kbps for CIF resolution to 19 Mbps for 720x480 NTSC or 720x576 PAL standard definition resolutions or can range from 4 Mbps to 19 Mbps for high definition video resolutions The higher the bit rate the be
56. odem to feed back link throughput constraints directly to the encoder to dynamically optimize video quality over such bandwidth constrained networking links 3 3 1 URL Control There are 2 URLs one to get the current video bitrate and a second url to set the video bitrate These URLs return plain text no HTML to simplify parsing The Encoder gt Bitrate link in the web UI allows you to set the video bitrate with a browser egi bin encoder_bitrate2 cgi Gets the current video bitrate Returns VIDEO_BITRATE xxxxxxx where xxxxxxx is the current bitrate egi bin encoder_bitrate2 cgi VIDEO_BITRATE xxxxxxx Sets the video bitrate where xxxxxxx is the desired bitrate Returns VIDEO_BITRATE xxxxxxx where xxxxxxx is the bitrate that was set The maximum video bitrate is 25000000 Examples of using the wget command The initial bitrate was 23Mbps wget q O http root root 192 168 1 23 cgi bin encoder_bitrate2 cqi VIDEO_BITRATE 23000000 wget q O http root root 192 168 1 23 cgi bin encoder_bitrate2 cgi VIDEO BITRATE 9000000 VIDEO_BITRATE 9000000 wget q O http root root 192 168 1 23 cgi bin encoder_bitrate2 cqi VIDEO_BITRATE 9000000 wget q O http root root 192 168 1 23 cgi bin encoder_bitrate2 cgi VIDEO BITRATE 500000000 VIDEO_BITRATE 25000000 3 3 2 Command line Control The program qvidium qvctrl allows you to communicate with the encoder via a command line interface such as telnet ssh or
57. oder the decoder will send an IP packet to the encoder to initiate a video session Note QVidium does cannot provide support nor make any guarantees or warrantees in relation to running the QVAVC SD encoder in Server Mode Due to CPU loading memory resource and network bandwidth considerations we cannot guarantee that this feature would work to your satisfaction 18 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 4 Decoder Configuration and Operation As with the encoder the decoder can be configured and operated from a web browser This section describes how to configure and operate the decoder 4 1 Decoding Profile and Web Interface You must use the web interface to edit the decoding profile Enter http IPAddress where IPAddress is the IP address of the decoder For example http 192 168 1 23 1 Make certain that the encoder is stopped as explained in Section 3 1 Select the Decoder menu on the left side of the web page Select the Profile menu option underneath the Decoder menu ADecoder Profile interface should display in the main area to the right of the menu system as shown in Figure 3a through 3c below and in Appendix B 4 Edit the decoder profile Three tabbed forms together comprise the complete decoder profile These 3 forms shown in Figures 3a through 3c allow configuration of network configuration ARQ error correction setup and config
58. r 2 MAC broadcast to which the QVidium products respond with their MAC address IP Address and name From this application you can double click on a Codec to launch a browser window to that Codec In addition CodecManager makes it simple to change the IP Address launch a Telnet window or edit other settings of any Codec it detects directly from the CodecManager application even if several codecs are mis configured with the same IP address You can also instantly stop all codecs by the simple click of a button We encourage you to download and use the CodecManager application to manage your QVidium products since it is easier more convenient and less intrusive than resetting the Codec through the console 8 2 Resetting the Network Parameters If you cannot determine the IP address using CodecManager you have two other alternative methods of resetting the IP address either through the Console RS 232 port or with a USB flash memory stick Console Port Method You can connect the Console serial port to log into the Linux shell and change the IP address or other settings To reset the IP settings connect a PC running a terminal emulator such we Hyperterm or TeraTerm at 57 600 Baud 8 N 1 no flow control and type ifconfig ethO lt IP address gt where lt IP address gt is replaced by the desired IP address for example ifconfig ethO 192 168 1 23 USB Flash Stick Method Go to http www qvidium com reset copy the autorun
59. r Size to a minimum of 500 ms or increasing it up to 1000 ms e Enable Detect Video Break so that the decoder will restart when it detects a break in the packet stream to help prevent the decoder from getting into a bad state Audio pauses clicks or gaps during decoding e Excessive network jitter such as on satellite long distance Internet or 3G wireless links can result in pauses or short gaps or clicks in the audio output To fix this increase the size of the decoder s Video Input Buffer Size to buffer out any excessive jitter on the video input stream Audio distortion e A tinny or metallic quality to the audio or a distortion that seems to appear only during periods of relatively louder audio passages can be the result of clipping of the input audio signal This occurs when the input audio signal level exceeds the voltage level limits of the audio input circuitry To fix this problem increase the audio attenuation in the Volume control on the Encoder when the encoder is running until the distortion is gone Other problems with encoding and decoding video 34 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 First eliminate any network problems by connecting the encoder and decoder to the same Ethernet switch Use CodecManager running on a PC also connected to that switch to verify that the IP and MAC addresses are all different 2 Click on Defaults on
60. r packet sequence and to buffer against erratic network delays Its goal is to output a smooth consistent flow of packets with increasing sequence numbers This output feeds the ARQ error correction mechanism The ARQ unit at the receiver watches for gaps in RTP sequence number from the de jitter buffer output and immediately sends out retransmission requests when necessary Incoming retransmitted ARQ packets bypass the de jitter queue and find their correct place in the ARQ buffer so that by the time packet are output by the ARQ buffer the ARQ error correction mechanism should no longer contain any missing packets When the encoder and decoder are both started the decoder automatically measures the round trip delay and packet jitter to the encoder and automatically configures ARQ for optimal operation according to a few basic user specified parameters as described in Section 2 3 2 Note For testing ARQ error correction select ARQ transport at both the encoder and decoder and use the default ARQ parameters at the decoder receiver 2 4 Advanced Video Encoder Configuration The encoder has a set of advanced configuration settings that you can configure from the Advanced Encoder Profile tab as shown in Figure 1b below These parameters are divided into 3 sections Advanced Encoding parameters Output parameters and Network parameters Advanced Encoding Parameters Capture Closed Caption CC For MPEG2 SD video only setting this to Yes
61. rage device the next storage device will be mounted as media sdal If you do not unmount the storage device or mount a second storage device the second device will mount at location media sdb1 Currently there us a limit of only 2 different mount points sdal and sdb1 Additional partitions on a given storage device will auto mount as media sdaX or media sdbyY where X and Y are partition numbers starting with 2 and incrementing up to the number of partitions on that storage device 9 2 Encoding to a File You will be using the application qvplayer located in the qvidium directory to operate the codec from the command line interface To get the full set of options to qgvplayer run it as follows qvidium qvplayer h We suggest that you first cd to the mount external storage directory and then run qvplayer To encode to a file run the following command qvidium vplayer I lt input source gt O file o lt output file name gt The input source can be composite or s video The encoder automatically detects the input video resolution whether it is PAL or NTSC For example to encode a composite input to an MP4 output file called test mp4 type qvidium qvplayer I composit O fil o test mp4 m mp4 30 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec The output video can be saved either as an MPEG 2 Transport Stream TS which is the default or
62. ream even through extremely lossy or congested networks The QVidium H 264 SD Mini Codec minimizes network bandwidth and loading due to its extremely efficient encoding and video transport The SD Mini Codec implements MPEG4 AVC H 264 High Profile Levels 4 and 4 1 video encoding providing advanced coding techniques in hardware such as CABAC processing not normally found in other MPEG4 codecs Our codec also features variable bit rate VBR transport which strips out unnecessary null packets from the video transport stream to minimize network loading Because of its VBR transport the QVidium H 264 SD Mini Codec does not include ProMPEG forward error correction FEC since the ProMPEG FEC specification does not include provisions for VBR video streams However as FEC cannot anticipate varying network conditions nor correct most forms of packet loss we suggest using ARQ if you need error correction or using a QVidium QoS ProxyServer if you require FEC 11 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec In contrast with FEC QVidium s ARQ is a feedback mechanism that detects packet loss at the receiver and requests the retransmission of only those lost packets from a video source A user configurable buffer at the receiver decoder delays the video stream just long enough to allow the system to replace any missing packets and re insert them in their proper order without
63. s within an RTP header so all transport types aside from UDP only are compatible with the ProMPEG Forums standard and the IETF RFC 2733 standard 12 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 2 3 2 Error Correction ARQ Automatic Retransmission Request To enable Automatic Retransmission Request ARQ you must first select ARQ transport from the Profile dialog ARQ transport must also be enabled at the decoder With ARQ selected and the encoder started the encoder will begin to save outgoing packets for later retransmission when necessary You must also be certain to configure any firewalls to allow the ARQ retransmission request packets through The default port for these upstream ARQ request packets is UDP port 7020 although you can configure this to any other valid non conflicting UDP port However if you choose to change the ARQ request port you must make certain the settings at the encoder and decoder match Note To help avoid firewall blocking at the encoder newer versions of the QVidium application firmware now allow setting the ARQ port to be the same as the UDP port At the receiver the ARQ error correction mechanism first buffers incoming packets in a synchronized network de jitter buffer that maintains a constant configurable delay for incoming packets The de jitter buffer processes RTP sequence numbers and reorders packets as necessary to restore prope
64. stly you can also either pass through the audio untouched including Dolby AC3 or transcode among Mpeg1 Layer 2 MPEG2 AAC and MPEG4 AAC audio formats ERII sveter nome ovava gt System Transcode Profile License mario Press here for Help Transcode Profile Import Export Default ranscode N letworl Mode IP to IP Video Bit Rate 1800000 Start Video Encoding H264 w Video Resolution 720x480 Audio Encoding Pass Through MPEG4 Profile auto MPEG4 Level auto Status Monitor Clear Stats Show Log Clear Log Stop Management Network 2004 2009 QVidium Technologies Inc All Rights Reserved Figure 4a Transcoder Profile Transcode Tab Since the transcoder mode acts as a combination of a decoder coupled directly into an encoder you can configure most of the same parameters as with the decoder network input parameters 24 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec ARQ parameters and optionally start the transcoder in Server Mode allowing the transcoder to initiate a stream from a remote source when you start the transcoder All these three configuration panels Network In ARQ In and Server are nearly identical to their corresponding configuration panels in the Decoder configuration profile Please refer to the Decode Section above and the Appendic
65. t place in the ARQ buffer so that by the time packet are output by the ARQ buffer the output of the ARQ buffer should no longer contain any missing packets The ARQ has five parameters that can be configured in manual mode Target Latency Burst Drop Robust Mode Number Retries and Round Trip Time In automatic mode the system automatically measures and calculates the Round Trip Time and Number Retries In most cases automatic mode and the default parameters should be adequate Of the required parameters the first parameter Target Latency specifies the total delay in milliseconds allotted for the request retransmission and recovery process The ARQ mechanism will attempt as many retries as possible within this target latency time Thus larger target latency times increase the delay before video is output but allows for more chances of requesting and recovering any missing packets A Burst Drop delay can also be specified to delay any retransmission requests for a time equal to the maximum expected packet loss time such as from dynamic router changes of other sources of burst loss A Robust Mode can also be selected When selected checked a minimum of two tries will be 22 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec attempted for recovering any missing packets When not selected unchecked ARQ will always try at least once to recover any missing packets
66. the RS 232 Console port The first argument is always dev qvencode The second argument is get_videobitrate or set_videobitrate xxxxxx where XXXXxx is the bitrate would want to set max bitrate is 25000000 The command always returns VIDEO_BITRATE xxxxxxx where xxxxxx is the current bitrate Here are examples qvave qvidium com qvidium qvctrl dev qvencode get_videobitrate VIDEO_BITRATE 4000000 qvave qvidium com qvidium qvctrl dev qvencode set_videobitrate 2000000 VIDEO_BITRATE 2000000 qvave qvidium com qvidium qvctrl dev qvencode set_videobitrate 8000000 VIDEO_BITRATE 8000000 17 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 3 4 Configuring the Encoder for RTSP and Server Mode After clicking on Start under the Encoder menu the configuration we had described in section 2 1 will immediately begin to send out a continuous video stream of UDP IP packets optionally encapsulated with RTP headers to the destination address However the QVAVC SD also has two alternate modes of operation that allows a remote Decoder such as another QVAVC HD code an Amino Set top box configured with QVidium software or the QVidium StreamViewer application to initiate the video stream These modes are RTSP and Server Mode 3 4 1 RTSP Mode Real Time Streaming Protocol or RTSP is a common and widely used protocol for controlling a video stream To set up the QVAVC SD cod
67. the Video Buffer Size Transcoding 1 2 Transcoding is limited to the first 2 audio channels others are discarded Closed Captioning and Teletext are not currently supported However Subtitles are supported Warning Running more than one of any of these operations at the same time may not work or may require restarting of one of the previously started functions QVidium does NOT warrant operation when starting more than one of the 3 modes of operation encoding decoding and transcoding at the same time when processing HD video or running multiple operations when there could be a conflict in resources such as decoding from ASI input while encoding from SDI input or transcoding from ASI input Versions 109 and greater disable running the encoder and decoder run simultaneously Under limited circumstances you can run the encoder and decoder simultaneously only for versions 103 and earlier 32 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec 1 1 Troubleshooting amp Support The H 264 SD Mini Codec includes a number of features to aid in system security and logging 11 1 Troubleshooting Common Problems No response from web browser or cannot ping system 1 Make certain that device is powered on and connected to your network 2 Check that green LAN light in front is lit and link light at RJ 45 port is on 3 Make certain that device is on the same
68. transport in exchange for significantly improving the robustness and reliability of video transport This section explains how to configure the video transport capabilities of the QVidium H 264 SD Mini Codec and how to enable ARQ error correction 2 3 1 Configuring Video over IP Network Parameters To configure the IP network parameters within the Network Parameters section of the encoder profile select among RTSP ARQ RTP or UDP packet transport Also specify the destination IP address and UDP port number The destination IP address may be a multicast or a unicast IP address The encoder encapsulates the video and audio signals as UDP packets in all cases regardless of the type of packet transport you select Specifying UDP eliminates the RTP header and encapsulates the encoder s multiplexed MPEG 2 transport stream directly as the payload of the UDP packet All the other transport selections add an RTP header to the UDP packet stream The RTP header adds a timestamp and packet sequence number before inserting the MPEG 2 transport stream packets into the RTP UDP IP packet payload All of these transport types insert an integral number of 188 byte MPEG 2 transport stream packets into the packet payload as specified by the TS packets per IP packet parameter The IP encapsulation adheres to the IETF RFC 2733 standard for video over IP that specifies that the packet payload must comprise an integral number of whole MPEG 2 transport stream packet
69. tter the video quality Audio Bit Rate compressed The audio bit rate determines encoding audio quality and allows you to trade off audio throughput for quality For two channels of audio the audio bit rate can be set to one of 64 000 128 000 192 000 256 000 or 384 000 bits per second Increasing the audio bitrate up to a maximum value of 384 Kbps increases the audio fidelity Regardless of the audio signal level on either channel selecting an audio bitrate of 64 Kbps or higher will always force the encoder to send 2 channels of audio stereo audio Each audio channel uses one half of the selected audio bitrate The H 264 SD Mini Codec encodes audio using either MPEG 1 Layer II encoding MPEG2 AAC or MPEG4 AAC audio encoding For minimizing the audio bitrate we provide the option of setting the number of audio channels to I and the audio bitrate to 16 Kbps or 32 Kbps Do not use an audio bitrate less than 64 Kbps unless you set the number of audio channels to 1 Even then setting the number of audio channels to 1 has the potential to cause unexpected halting of the encoder So please be aware that this option may impact the reliability of the encoder Audio Sampling Rate Hz The audio sampling rate specifies the clock rate for capturing and digitizing the incoming analog audio signal Because of anti aliasing filtering the maximum audio frequency that can be digitized is limited to a frequency of about 1 3 to 1 2 of the audio sampli
70. uration of a remote QVidium video server respectively Please refer to Appendix B for a detailed description of each of these parameters System License Encoder 1 Encoder 2 Decoder Profile Import Export Default Start Status Monitor Screen Clear Stats Show Log Clear Log Stop Transcode Management Network Ridin System Name QVAVC SD Decoder Profile Press here for Help Network ARQ Server IP Transport Pvy Multicast Address 2 I UDP Port oo Jitter ms o P video buffer size ms bo P out Of Order Packets 3 o Detect video break network input only besyv Detect video break limit 100 to 2000 ms 0 1 If set to ARQ the incoming bitrate must be less than 4Mbps 2 This is not the sender s IP address 3 Normally set to 0 Additional out of order buffering for ARQ and RTP only 2004 2010 QVidium Technologies Inc All Rights Reserved Fi 19 of 47 Copyright 2009 2010 QVidium Technologies Inc User s Manual v 8 QVidium H 264 SD Mini Codec gure 3a Decoder profile Network Tab System Name QVAVC System Decoder Profile Encoder Decoder Press here for Help Profile Export Network ARQ Server Default SE ARQ Port 1 7020 Start Mode C WW O O O O O OC W AC Status Manual Mode Parameters SSS Clear Stats NumberRetries i onoo Stop Roun
71. ystem clicking on Network Ping and entering the IP address for the decoder device Cannot get decoder to display video 1 Use network monitor software on look for blinking link lights to be certain that the encoder is sending packets to your decoder If not follow the steps for Cannot get encoder to send IP packets 2 Make certain that device is powered on and connected to your network 3 Check that green LAN light in front is lit and link light at RJ 45 port is on 4 Try pinging the encoder by entering the IP address for the source device For a H 264 SD Mini Codec try clicking on Network Ping 5 Make certain that both encoder and decoder are set to the same stream type Program or Transport the same transport type ProMPEG ARQ RTP or UDP and encoding type MPEG2 or MPEG4 For a Set Top Box such as an Amino make certain that the encoder is set to Transport amp UDP 6 Make certain that the encoder is not sending CIF or SIF resolution The decoder can only decode FULL or HD resolutions The decoder cannot scale the incoming video resolution Color loss on decoded video e Network losses or other interruptions that can cause breaks in the input video stream may cause the decoder to lose sync and get into a state where it cannot decode color resulting in a complete loss of color on the decoded video output e To help increase the tolerance of the decoder to these issues try increasing the Video Buffe

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