LOLA Low Latency Audio Visual Streaming System
Contents
1. 2 Hardware and Operating System pre requisites In order to achieve a low transmission and presentation latency LOLA relies on software optimization and on high performance audio and video devices Low latency video in particular has been achieved by adopting a family of industrial video grabbers which at the moment are only supported under the MS Windows Operating System To date LOLA has been tested on both MS Windows XP and MS Windows 7 32 bits and 64 bits versions 2 1 Audio input output hardware requirements Low latency audio performance requires that small in out audio buffers can be used that no bottlenecks are present in the data transfer between the converters and the system and that robust and efficient software drivers are available for the OS in use USB and FireWire IEEE 1394 external devices do not offer such a fast data acquisition processing thus LOLA uses a PCI PCIe internal device and a reliable ASIO driver To date the following Audio boards have been tested and have shown good performances RME Hammerfal HDSP 9632 PCI internal card RME Multiface II PCI PCle host card external ADC DAC box 2 2 Video input hardware requirements Fast video acquisition and streaming relies on a family of video grabbers by BitFlow Inc which provides high hardware performances and a versatile programming API for low level video processing control The BitFlow video grabbers currently used by LOLA are the analog one2. VFG2_ TRIGGER _ N VFG2_STROBE VFG2_VD VFG2_VIDEO VFG2_VIDEOO VFG3_VD VEG4_TRIGGERC_OUT VFGSA STROBE VRGoa_VIDEO VEG4_VIDEOO GND GND VEGO_TRIGGERIN VFGO_STROBE VFGO_VD GND GND VEG1_TRIGGERIN VEGI_STROBE GND GND GND VFG2_HD VEG2Z_ TRIGGER_OUT VFG2_WEN GND GND VFG3_HD VFGS_TRIGGER_ N GAD 1 tap 2 tap Cameras Cameras Camo Tapt Cam Tapi Cami Lamis lap Cam Tap O Color Cameras Camo R Cami B Camz B Camy R Cami G Cami R LOLA Low Latency Audio Visual Streaming System Cable for Sony HR50 The VGA connector has 3 coaxial cables for video signal but for b w cameras you only need one Just select for example the G green one Use the twisted pairs for the other signals Remove both VGA connectors from the cable and connect the pins as follows Hirosi 62pin signal comments 43 Ground 2 5 12V 3 3 Ground VIDEOI shield coax 4 2 VIDEOI1 VIDEOI signal coax 5 44 Ground 6 24 HD 7 47 VD 8 4 Ground 9 23 Ground 10 26 WEN IN 11 25 TRIG OUT 12 48 Ground Cable for Hitachi KP FD30 Remove one of the VGA connectors from the cable and connect to the 62 pin connector as shown in Fig 10 the other VGA connector 1s already correctly connected to go on the camera VD shield g wire shield r m wire shield Figure 10 The cabling for the Hitachi KP FD30 camera LOLA Low Latency Audio Visual Streaming System Appendix D Setting Camer
3. 3 LOLA allows the user to select different frame rates 30 or 60 fps from its own setup dialog windows In order to make this option work the camera must be configured to allow triggering by an external source See Appendix D to correctly set the supported cameras Camera Setup Check After the camera files have been registered it Is recommended to check that the video grabbing devices are working properly by using the CiView exe utility provided with the BitFlow SDK in the same location as the SysReg exe tool Note that with this particular configuration the camera must triggered by an external trigger This can be achieved by running the application in Free Run Mode this option is availabe in the Preview menu When LOLA is launched it will check for all available video BitFlow devices if none is available the program will provide a warning and run without video support It will be possible to select the desired video camera among the ones configured with the BitFlow SysReg exe utility from the Audio Video Setup dialog window available in the Tools menu Fig 3 3 4 Installing LOLA After the WinPCap and BitFlow SDK are installed to install LOLA unzip the zip file provided in a directory of your choice To run LOLA just launch the LolaGuivx x x exe x x x version number application The first time the software is launched LOLA will ask you for a user identification and an activation code Just insert the ones y
4. Exposure Control CTABs vo Quad Encoder line Frame Sensor Triggering Identification Comments Horiztonal encoder Encoder polarity Rising edge sl Encoder input Differential vl Extemal encoder Disabled v Vertical trigger Triggers vertical CTABs edge mode gt Trigger polarity Rising edge y Trigger input Bemal trigger Enabled Vertical reset TEnd of frame fixed size Encoder multiplier 7 00000 Vertical trigger delay lines p Time out milliseconds 4096 Reset Reset All Apply Ctrl 4 For Help press F1 Figure 9 The CamEd exe utility and the external trigger flag set to enable Other parameters which might need adjustment and the camera resolution and the video sensor offsets Please contact lola project conts it for assistance if you plan to use a different camera from the ones in the supported list Work is also in progress to support generic RGB and YpbPr input video sources LOLA Low Latency Audio Visual Streaming System Appendix C Cameras Cabling Guide Although you can buy appropriate cables for many of the analog cameras to be used with the BitFlow grabber cards this short guide can help you in building your own high quality cables In order to start we suggest to use high quality VGA cables which you can quite easily get anywhere A good reference model are for example the Belkin F3H982 which comes in different lengths For b w
5. and a very minimal data buffering the whole end to end network connection must be with very high performance low jitter error free and the lowest possible network latency packets Round Trip Time RTT network latency adds in fact to LOLA system latency and the sum define the upper limit when real time human interaction is still possible LOLA has been developed to use the services provided by the Research and Education hi end networking services like GARR GEANT Internet2 and can run both on shared IP network services TCP and UDP or on dedicated circuits which provide better network performances and reliability especially at high bandwidth configuration It 1s recommended to perform end to end network tests also using additional tools like iperf or equivalent http iperf sourceforge net trying to simulate LOLA expected traffic before using LOLA itself These tools are also useful as a powerful network debugging aid in case of problems using LOLA LOLA Low Latency Audio Visual Streaming System Table 1 Suggested configuration for Analog B W and color video streaming Host PC Intel dual quad core based system 15 17 required for color with 4 GB RAM 500 GB Hard Disk Motherboard with PCIe bus and DDR2 DDR3 ram technology 1 or 2 Gbit LAN ports PCIe Graphic Adapter Low noise case power supply with enough PCI PCle free slots Audio RME Hammerfal HDSP 9632 PCI internal card RME Multiface II PCI PCIe host card
6. external ADC DAC box Video Bit Flow ALT ANI grabber with at least SDK 5 60 drivers Sony HR50 b w analog video camera or hitachi KP FD30 analog color video camera Analog cable for camera connection low video latency time LCD Monitor Network 1Gbps end to end connection See session 2 5 above LOLA Low Latency Audio Visual Streaming System 3 System Setup 3 1 Install required libraries and drivers LOLA relies on the WinPCap windows packet capture library which has to be installed on the PC The installer can be found at the following address http www winpcap org Download and install the latest available firmware and drivers form the video board producer site http www bitflow com index php DownloadTable In order to support 64 bits Windows version the minimal SDK version must be 5 60 select Software BitFlow SDK 5 60 In case you have installed previous versions or you are upgrading an older LOLA version you must first remove the old SDK and then install the new one You do not need a license code for the BitFlow SDK thus just install it as drivers only when prompted for the serial number Download and install also the latest available firmware and drivers form the audio board producer site 3 2 Audio hardware Setup Update install the drivers first see section 3 1 Before using the software it is highly recommended to check if there 1s any board setup panel pr
7. the two hosts by clicking on the Disconnect button When the software is shut down the current local configuration 1 e audio and video setup will be saved on a ini file located in the same directory as the executable and will be loaded at the next start up of the Lola application Also the last session information remote host address and info is stored for future sessions 4 6 Debugging a connection Bounce Back mode To allow some easier debugging in case of problems and to let you check the quality of your transmission as rceived on the remote site under the Tools menu you can enable the Bounce back mode When selected the remote LOLA host will start bouncing back your video stream instead of sending its own This action does not require any intervention on the remote host On the other hand if you also want to have your audio to be bounced back an action is needed on the remote host by either physically connecting the in out audio on the card or by telling the audio card mixer to route the audio in back to out channel This bounce back feature 1s still experimental and also requires the remote host to use quite a lot of processing power LOLA Low Latency Audio Visual Streaming System 4 7 The Color menu The Color menu is intended for use with not yet supported cameras digital cameras or other types and thus shall not be used for normal operations with analog cameras Please ensure that Color Bayer Dec
8. LOLA Low Latency Audio Visual Streaming System TTTTTTI IT TTTTTTT ITITII TTTTI Conservatorio EEIEIE Ee LeeLee eet di musica CEIF T PTE ist Giuseppe TTTTITHTTITTTITTITTITTTITI TTT Tartini TTTT TTTTTTTTTITTITTITTIITIIT TTT TT Trieste LOLA Low Latency Audio Visual Streaming System Installation amp User s Manual 2005 2012 Conservatorio di musica G Tartini Trieste Italy version 1 1 7 http www conts it artistica lola project lola project conts it LOLA Low Latency Audio Visual Streaming System 1 Introduction Lola is an Audio Visual Streaming System developed by Conservatorio di Musica G Tartini Trieste Italy with the goal to provide a tool for real time audio video natural distance human interaction It was originally conceived for distance music performances education and production but can be used for any other scenario where real time interaction 1s required A special attention has been paid to the optimization of the signal processing and transmission in order to keep the system latency as low as possible below the human delay perception threshold The system is based on high performance audio video acquisition hardware and on the integration and optimization of audio video stream acquisition presentation and transmission The LOLA system also requires very high performance Wide Area and Local Area Networks 1 Gigabit per second end to end connection is the minimum suggested configuration
9. as in External Trigger Mode This section show how to correctly set in External Trigger Mode the supported cameras If you are using a camera not listed here contact lola poject conts it for assistance Sony HRS0 setting for external trigger mode If using the Sony HRS0 B W analog camera the camera must be configured according to external trig shutter mode 2 DIP switches 6 7 set to OFF and DIP switch 8 set to ON see Fig 11 Figure 11 Sony HRS0 DIP switch setting for external trig shutter mode 2 Hitachi KP FD30 setting for external trigger mode If using the Hitachi KP FD30 color analog camera the camera must be configured according to external trig shutter mode the internal DIP switches accessed by removing the back panel of the camera should be set as follows SW6001 Lower side input sync SW6002 Upper side Fig 12 SW6001 SW6002 Figure 12 Hitachi KP FD30 internal switch setting for external trig shutter mode LOLA Low Latency Audio Visual Streaming System The camera rear switch should be set for progressive scan as follows 1 On VGA progressive scan 2 Off 3 Off 4 Off Fig 13 Camera rear switch SW 1 ON Upper side VGA progressive scan mode 1234 Factory setting Is i VGA progressive mode Pia SW ON OFF Note Please turn OFF SW 2 and 3 and 4 They are not used Figure 13 Hitachi KP FD30 rear DIP switch setting for progressive scan mode Finally the shutter mode field
10. cameras you will often need a 12 pin Hirosi connector model HA 10A 10P 12S while color cameras often use a standard 15pin VGA connector thus you do not need to replace the one already on the cable For the BitFlow grabber 62 pin connectors the suggested parts are Plug model AMP 748367 1 Shielding HW model AMP 748471 1 Enclosure model AMP 748476 1 Please always check the camera documentation for the correct cabling The following are the schemas for LOLA supported cameras In addition here is the BitFlow 62 pin cabling full specification Table 10 1 Alta AN Main Connector Pin In Out Signal 1 tap 2 tap Color Cameras Cameras Cameras 1 II VFGO_ VIDEO Camo B 2 II VFGO_ VIDEO1 Cam0 Cam0O Tapil Camo G 3 AGND 4 AGND 5 Power VFGO_12V_POWER AGND 7 Power VFG1_12V_POWER 8 II VFG1_ VIDEOS 9 IN VFG1_ VIDEO Cami Cami Tap Cami G 10 II VFG1_VIDEOO Cami Tap Cami R 11 AGND 12 AGND 13 Power VFG2_12V_POWER 14 AGND 15 IN VFG _VIDEOS 14 II VFG2_VIDEOI Cam2 Cam Tapi Camz G 17 AGND 18 AGND 19 Power VFG3_12V_POWER 20 IN VFG3_ VIDEOS 21 IN VFGI3_ VIDEO Cama B d Zi 24 25 26 dI 28 29 430 41 32 33 34 a d 37 38 a 40 a dd wat 5 x ay B oF 50 51 52 53 54 55 54 57 58 59 60 61 LOLA Low Latency Audio Visual Streaming System Signal VFGO_VIDEOS VFGO_VIDEOO VFGO_HD VROoO_TRIGGER_LOUT VEGO_ VEN VE 1 l TRIGGER OUT VEGI_VD VEGI_HD VFG1_VIDEO VEGI_WEN VEG 1WEN
11. due to network traffic or delay jitter otherwise it should be kept as low as possible to avoid additional latency In a typical correct situation video buffers are both set to 0 and audio buffers should not exceed 5 iF Local host 640x480 8 bit 50 35 FpS LOLA Low Latency Audio Visual Streaming System Network Monitor Network Status and Activity Monitor Remote Connection Sending to 192 168 0 20 Receiving from 192 168 0 20 Audio Port 19788 Frame Size byte 256 Packet Size byte 1000 Sent Packets Receiv Packets Drop Packets Start audio Threads I Stop Audio Tx Stop Audio Rx Jitter simulation tx Audio Video Port 19798 Frame Size byte 307200 Packet Size byte 1000 Sent Frames Receiv Frames Drop Frames Start video Stop Video Tx Stop Video Rx Video Figure 7 Buffer tuning panel left and network monitor panel right 4 4 Toggling Audio Video and Network Monitor During a connection the user can also gain some information on the audio and video stream through the Network Monitor panel available in the Tools menu Fig 7 right This dialog box provides some information on the connection and on the traffic as well as the possibility of selectively switching off on each one of the inbound outbound audio and video streams 4 5 Disconneting from a remote host The connection can be interrupted by any of
12. ible a remote address to call IP address a Check button to make a quick and simple pre connection test a Connect and a Disconnect button A Session name box allows you to assign a specific name to a setup configuration for easier identification It is also possible to recall previously saved setup data including the remote party IP address for an address book quick call operation via the File menu Open and Save options LOLA also remembers the last session setup thus it will always restart from the last session configuration J LOLA Low Latency A V Streaming la e File Options Tools Color View Help Remote Session z Local host 640x480 8 bit 50 30 FpS i Window Zoom Palette Session Name Sessioniiame IP Address 0 0 0 0 Check Connect Status Not connected A V Presentation Local Audio On Recording Audio Start New Files Path Status Not Recording Ready NUM Figure 4 Lola main window the control panel left and the local host video frame 4 1 Local audio and video settings Before attempting to connect to a remote host the user should correctly configure the local audio and video options The Audio Video Setup dialog in the Options Menu Fig 3 allows to select the desired ASIO audio device the video camera file and the desired video frame rate 30 60 fps It is recommended to verify that audio input is working proper
13. in the software setting menu of the camera should be set to Ext Trigger Main Menu gt Shutter Menu gt shutter mode
14. le with LOLA 1s as follows Adimec e g A1000 Camera Link or Opal2000 CoaxPress Basler e g L100 or L300 series CIS e g VCC F32 series Hitachi e g KP FD30CL Imperx e g ICL B0610 Leutron Vision e g PicSight P34B PoCL Jai e g RMC 6740CL PhotonFocus e g MV D640 C series Sentech e g STC CLC33A Toshiba Teli e g CS6910CL Uniq e g UP600 CL LOLA Low Latency Audio Visual Streaming System Appendix B Compatible Video Cameras Analog B W cameras with characteristics similar to the Sony HR50 can be easily found On the other hand analog color cameras with frame rates gt 30 fps 640x480 and RGB output seems to be rare on the market A few examples of brands offering analog RGB cameras are Toshiba e g IK TF5 JAI Pulnix e g the CV M91 series Hitachi e g KP D20A B Using a different camera color or b w usually requires adapting creating a new camera file specific for the camera itself You can start from the ones available in the distribution kit and create a new one for the intended model Finally the camera file must also be compliant to external trigger mode This can be achieved by editing a camera file with the CamEd exe tool available in Start All Programs BitFlow Sdk 5 60 and setting the External trigger flag to Enabled in the Triggering menu item Fig 9 es CamEd File Display View Window Help Sony XCL 5005 W2 OneShot ExtTrig TTL r64 Bayer Misc
15. ly 2 5 milliseconds or an old style CRT monitor The way you connect the monitor to the PC may also cause additional latency Use VGA DVI D or RGB connectors avoid HDMI In case you use any additional device like video splitters cable extenders etc please ensure that they do not add significant further latency to the video output chain If you need dual video output try to use graphic cards in the PC which already have native dual output instead of using external splitting devices 2 4 PC hardware requirements The LOLA software runs on a typical multimedia PC A suggested configuration consists in a Intel dual quad core based system 15 17 for color support with 4 GB RAM 500 GB Hard Disk and the following characteristics Mid high performance motherboard providing PCI Express bus and supporting DDR2 DDR3 ram technology 1Gbit LAN port LOLA supports 1 LAN port at present might support 2 LAN ports in the future for higher video resolution Integrated graphic adapter should be enough however a PCI Express Video Adapter e g Nvidia GeForce cards is recommended especially for color video processing _Enough PCI PCle free slots to host the Audio card the PCIe Graphic adapter and the BitFlow grabber Note the video grabber requires a x4 PCIe slot at least Using a lower bandwidth PCIe slot sometimes located besides the PCIe x4 and PCIe x16 ones will result in bad video grabbing performances Mid t
16. ly and the input latency is low as expected A rough test can be done by switching on input to output redirection using the Local audio On Off flag available on the control panel in the main window see Fig 4 and using headphones connected to the LOLA audio card output to avoid an audio feedback effect Further checks on the audio setup can be done using the appropriate audio card mixer setup application LOLA Low Latency Audio Visual Streaming System If the local video camera is connected and the correct camera file is selected you should also see in the Local Host windows your local video Also in this case you should check that the local video latency is low as expected You should also check that the local audio and the local video are synchronized correctly The features of the local video stream resolution pixel depth frame rate are shown on top of the video frame as shown in Fig 5 Local host 640x480 8 bit 50 30 FpS for the case shown It is finally possible to enlarge the video frame by selecting the desired zoom ratio form the menu available on the video frame Fig 5 Figure 5 Resize video frame options 4 2 Connection with a remote host The simplest way to connect to a remote host is by specifying its IP address in the Remote IP Address box and clicking on the Connect button You can also assign a Session name label for easier identification into the corresponding box You may also l
17. oad a previously saved Session Configuration File in which the address information for a given host is stored These are files with extension ssn and can be loaded saved using the File Menu Fig 6 These files are stored into the same folder where the LOLA application is The configuration stored into the LastSsn ssn file 1s always the settings used in the last LOLA session If you want to create your own LOLA address configuration book Just create one ssn file per each site you usually connect to and then recall the appropriate one when needed To remove a stored session configuration just delete the corresponding ssn file in the LOLA folder LOLA Low Latency Audio Visual Streaming System LOLA Low Latency A V Streaming Options Tools Color View Help Open Ctrl O g Local host Save AFE z Window Z Save As Exit IF Address 0 0 0 0 Check Figure 6 Session load save options Before sending a connection request it Is recommended to check if the remote host is ready for the connection After inserting the remote host IP address use the Check button provided in the control panel below the IP address box LOLA will issue a ping request the remote host at the given IP address and will also check if LOLA 1s running on it An estimate of the network round trip time RTT will also be provided If the remote host is reachable but LOLA is not running on it you should ask your remote party to start LOLA
18. oding 1s not checked Refer to Appendix A for further information on this work In progress LOLA Low Latency Audio Visual Streaming System Appendix A experimental digital video setup A CamerLink Digital B W and Color video configuration is being tested and at present it 1s not still clear whether its acquisition latency is as low as that of analog video grabbing The Camera Link configuration under test is as follows BitFlow Neon CL grabber with SDK 5 60 drivers Sentech STC PoCL33A color video camera color output is Bayer encoded needs SW Bayer decoding Tools View Help a Color Bayer decoding B bit SO Color Correction ced Choose Bayer Matrix Auto Balance 0 0 0 0 White Balance Algorithm a figure 8 Color options available in the Color menu The Color Menu Fig 8 allows to switch from B W to Color by software Bayer decoding for digital video cameras supporting colors through Bayer encoding The functions available in the Color menu provide support for color correction through RGB components balance Bayer matrix type selection decoding algorithm selection Digital color video will require a pixel depth of 32 bits per pixel whereas B W usually requires 8 10 bits per pixel and analog color requires 24 bits per pixel Digital Camera Link cameras are found on the market in a wide variety of brands and models and a selection of cameras both B W or RGB and likely to be compatib
19. on his local host and wait for your connection request to come 1n If LOLA is running on the remote host pressing the Connect button will cause the two systems to negotiate the connection and start sending their audio video streams to each other Only one node needs to initiate the connection Note that while different video stream characteristics are allowed for the two hosts e g different frame rate picture resolution bit depth color or b w the audio stream parameters must be exactly the same By default 44100 Hz 16 bit stereo is assumed If during the negotiation an incompatible setup is detected the two hosts will refuse to connect 4 3 Fine Audio Video buffer tuning Once the two hosts are connected the user will have the opportunity to interactively change the number of audio and video buffers used by the application by using the Buffer Tuning panel available in the Tools menu Fig 7 left The number of buffers can be set both using the control slider or by typing the value into the box below the slider For the video you can control both the number of buffers you use before sending your video Local and the number of buffers you use before displaying the received remote video Remote For the audio you can only control the number of buffers you use before rendering the recelved remote audio The number of buffers can be increased if dropouts or glitches are noticed in the received audio or video streams
20. ou received Then the Audio Video setup dialog window will pop up Fig 3 asking for first time device selection The setup will then be stored in a ini configuration file in the current directory and will be used in future sessions LOLA Low Latency Audio Visual Streaming System Audio Asio device ASIO Hammerfall DSP b Video BitFlow Camera File Frame Rate Fos SenTech STC FoCL334 E3 FreeRun r64 Figure 3 Audio Video Setup Dialog 3 5 TCP UDP ports used by LOLA LOLA will use by default ports TCP 7000 UDP 19788 and UDP 19798 for service communication and audio video streaming It is thus required that no restrictions apply for these ports e g due to firewall settings or local network administration policies 3 6 Tuning the LOLA workstation It is recommended to switch off other applications that might interfere with the audio video streaming process when the application is used in production sessions anti virus scanning software or similar should be carefully disabled The fine tuning of the Operating System for audio video streaming applications might also be advisable although it is not strictly necessary A throughout list of settings and optimizations suggested for use of the DVTS networking software can be found here http www nws edu searchresults aspx search DVTS LOLA Low Latency Audio Visual Streaming System 4 Running LOLA LOLA user interface Fig 4 1s intended to be as simple as poss
21. oviding latency settings on which the software applications have no control The RME driver usually provides a DSP Setting Panel as the one shown in Fig 1 a link to it is usually available in the bottom left tool bar in Windows 7 XP Set the hardware latency Buffer Size to the smallest available 32 or 0 7 ms When LOLA is launched it will check for all available audio ASIO devices if none is available the program will provide a warning and run without audio support It will be possible to select the desired ASIO audio device from the Audio Video Setup dialog window available in the Tools menu Fig 3 LOLA Low Latency Audio Visual Streaming System Wod Clock Out Ersakout Cable Mio P sea I Single Speed f KLA epc SPDIFIn Clock Mode Input Level Optical AutoSyne Lo Gam r Coasal gt Masher C 4 du Internal Pref Sync Ref 10 dB ML AES 4 Word Clock Output Level C 12 12 me IT Ts ADAT In HiGan C 1024 23 ms SPDIF Out C SPDIFIn C 4 dBu r 2048 46 me m f 10 de Unical r ma asun Ref 4095 33 ms Professional irput Mo Lock Phones SyneCheck Emphasis Freq Ode k Mi mi 6 dB Ward Clock NoLock TT NonAudo em Clock fi ADATIn Ma Lack r SPDIF Fieq Moje Mater SPDIFIn NoLock NoLock Freq 441kHz Mute Figure 1 audio device control panel 3 3 Video hardware Setup Update install the drivers fi
22. ower case with low noise power supply unit and fans and at least four full height expansion slots LOLA Low Latency Audio Visual Streaming System 2 5 Network requirements LOLA requires at least 100Mbps in minimal configuration standard definition b w 30 frames per second up to 500Mbps in full configuration standard definition color 60 frames per second and generates a very high Packet per Second PPS rate as it uses 1K data packets e g from 100 up to 500 KPPS Thus the minimal end to end connectivity must be at least 1Gbps This requires 1Gbps compliant cabling Cat6 or optical and adequate networking hardware You should pay special attention to LAN switches performances when using LOLA because of the high PPS rate in particular when other data flow compete on the same switch in general the ideal situation 1s when the LOLA workstation is directly connected to the Wide Area Network device router or switch at 1Gbps with no other network devices in between or at least there is no competing network traffic on the LAN devices being used by LOLA data traffic The following table gives an approximate estimate of LOLA bandwidth traffic b w 30 fps 95Mbps b w 60 fps 180Mbps color 30 fps 260Mbps color 60 fps 460Mbps LOLA should not run behind a Firewall and should run with a public IPv4 address no NAT IPv6 addresses are currently not yet supported As LOLA provides no error recovery procedures
23. rst see section 3 1 Before using an application relying on Bit Flow video devices a so called camera configuration file must be installed for each camera possibly connected to the BitFlow grabber The utility SysReg exe available in Start All Programs BitFlow Sdk 5 60 can be used to add a new camera file to the grabber note for these tools to affect the system configuration in Windows 7 they must be run as Administrator It is useful to also install test camera files which can generate synthetic video with a wide range of frame rate and resolution characteristics You should install the camera files for the video camera s you intend to use with LOLA The current camera files for the LOLA tested cameras are included into the CameraFiles folder inside the LOLA distribution kit 1f not already included into the BitFlow standard distribution Sony HRS0 SONY XC HR50 EXTRIG SHUT MODE2 anlg Hitachi KP FD30 Hitachi RGB 648x480 ExtTrig NTG anlg LOLA Low Latency Audio Visual Streaming System Board Details nt Board type modell R64 0 NEO PCE CLE Board ID register E Board DIA latency 255 Attached cameras SenTech STC PoCL334 E3 FreeRun ribi Figure 2 The SysReg exe utility The Add button allows to choose new camera files from the list of available ones When the camera files are installed you can select the appropriate camera from the Audio Video Setup dialog window available in the LOLA Tools menu Fig
24. s like the Bit Flow ALT AN grabber with SDK 5 60 drivers LOLA Low Latency Audio Visual Streaming System which supports both analog b w and color cameras A possible camera for LOLA for b w service 1s the Sony HR50 b w analog In case of color video acquisition the video camera must provide component analog color output RGB or YpbPr For color operation the PC running LOLA should provide enough CPU power to deal with data processing 1 e an 15 17 CPU based workstation is recommended The following color camera has been extensively tested with LOLA and a camera file is provided Hitachi KP FD30 color analog To connect the cameras to the video grabber you need appropriate analog cables Analog cables length can vary and up to now cables up to 12m have been successfully used Longer cables should work fine as well but testing that the performance does not degrade is recommended These cables can be easily created starting from high quality VGA cables both for b w and color analog cameras A schematic of the cable pinout is included in Appendix C LOLA also experimentally supports digital Camera Link grabber and cameras B W and Color See Appendix A for details See also Appendix B for further considerations and a short list of compatible video cameras 2 3 Video output hardware requirements LCD LED monitors introduce additional latency w r t CRT monitors Use a fast LCD LED monitor with low response time usual
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