OptoFidelity Video Multimeter User Manual
Contents
1. 5 150 100 Sl E Ij 100 150 Audio early Hudio late Figure 12 Lip sync tab s graph showing the measurement statistics Graph visualizes the statistical results Square shaped indicator s width corresponds to the deviation and location corresponds to the average value of lip sync over whole measurement Minimum and maximum values are visualized by small markers located at both sides of the square The scale of the graph is 200 200 milliseconds where negative value indicates that audio was early Correspondingly positive value indicates that audio was late Graph scale colors green yellow red come from different standards and suggestions Limits which are only instructive are set as follows e Green Good within 15 45 msec Acceptance limit according to ATSC IS 191 e Yellow Moderate within 45 125 msec Human noticeable limit according to ITU R BT 1359 1 e Red Poor over 45 125 msec Human noticeable limit according to ITU R BT 1359 1 It is important to understand that for example moderate result does not necessarily indicate that measured video is perceived as bad This is because the final user experince also depends on the video content and watching context large TV set versus small mobile terminal The abovementioned standards and suggestions are good reading when product service specific acceptance limits are specified 4 4 Saved data files with Lip sync option When the L2. OptoFidelity Video Multimeter User Manual Version 2015Q2 0 OptoFidelity OptoFidelity Oy e sales optofidelity com e www optofidelity com 8 a OptoF idelitu OptoFidelity Video Multimeter User Manual Contents 1 General information on OptoFidelity Video Multimeter ccccceeeeeeeeeeeeeeeeeees 3 2 DEVI SVEDESE 3 3 Framerate measurement task ciii coiere irre rr repre rers erreer 4 cO uu Er menn 4 De i i dioi EUST I ITI 7 3 3 Config ration TAD xixieces rixr ni ntc ink ncn Rincon CREER Eine Eon RC RR TERRE RR 7 C COLO CaO MR T T E Ses o o TET 8 Ia SAV ddaa BUT E IU ILIUM 9 4 Lip Sync measurement ODIO werricecavesdens ter sisuntevsistoneadsxateensateduninecovestencesenrs 9 4 1 Option license activation eeeeeeeeeeieeennnnnnnnnnnnnmnenh hh nnn nnn 10 4 2 Audio input cable connection ssssseeeeessseee nennen enhn nnn nnn 10 4 3 Framerate application s Lip sync tab ssseseseeeenn mnn nnns 10 4 4 Saved data files with Lip sync option sssseseeee nnn 12 S MOSbCcornectloDzsssureddadeudeedasedunddddmE gud ad md RbRE wei dU ait EL Ogden Kad NEUE V KU E Ed 13 5 1 USB connection with Remote control API c cece cen 14 6 External trigger output option cece cette eeeeee cece seen eee e nese eeeeeeeeaeeeeeenennees 14 6 1 Option license activation ccc cece cece eee e eee e eee eee eee e esse nehmen nnns 14 6 2 External trigger configurat
3. up on the graph constantly This indicates that some colors have not been detected Page 8 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual Calibration is performed as follows 1 Position fiber on a color marker on display The video must be running 2 Press Calibrate button on the Config tab Calibration takes few seconds and fiber must be kept still on the marker during this time 3 New calibration is valid immediately If required you can do calibration again or deactivate calibration by pressing the No calibration button Note Color calibration is only necessary for the RGB marker It is not necessary and cannot be successfully performed for other kinds of markers 3 5 Saved data files The saved data files from frame rate measurement are in semicolon separated CSV format Each row corresponds to one frame and has the following columns 1 Microsecond timestamp of the frame start 2 Microsecond length of the frame 1 for dropped frames 3 Color of the marker in the frame 4 Cumulative count of frames dropped since start of measurement A B C D 1 amp Recorded at 2013 05 27 08 39 18 using OptoFidelity Video Multimeter 2 Timestamp us Frame time us Color Total dropped frames 3 0 42560 r 0 4 42560 36640 y 25 79200 42560 E 0 6 121760 38620 c 0 i 160380 43550 b 0 5 203930 36020 p 0 g 240550 42590 r 0 10 283140 36620 y Figure 8 Data file saved from frame rate measure
4. License file name is camera trigger ini and it should be copied into folder frm license The file contents is as follows an example OptoFidelity Video Multimeter license file Device serial number 5 Feature name camera trigger License salt 1706318843 key 2287536893 Page 14 of 22 a 8 OptoFidelity OptoFidelity Video Multimeter User Manual expire 0 Device serial number must match the physical Video Multimeter device License files are generated by OptoFidelity only License files should not be edited manually 6 2 External trigger configuration External trigger feature is active when the corresponding application is started from the main menu The Trigger camera on frames setup page shows the parameters that can be controlled Trigger camera on frames X PuIse length O T ims 10 ms Pulse delay Min interval aiensitivity Low High Backlight filter Ort Manual trigger Figure 16 External trigger output control application Explanation of the functions e Pulse length msec the length of the positive pulse that is generated ata moment of detected video frame e Pulse delay msec delay between the video frame detection and the rising edge of the pulse e Min interval msec time that the Video Multimeter waits before outputting new pulses per detected new video frames e Sensitivity adjusts the sensitivity how small color changes are detected as frame changes For the mo
5. c tab After the preconditions mentioned in the previous chapters are fulfilled valid license file audio cable connected the Framerate task shows additional tab in the Video Multimeter UI Page 10 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual stats Config Lipsync AalFPS Sh frames Audio the ms late Figure 10 Framerate application Overview tab with lip sync feature activated Additionally Overview tab contains indicator for momentarily lip sync value Small blue marker in the graph shows the position where audio markers were detected Lipsync tab contains tools for adjusting the audio level and indicators for visualizing the lip sync measurement statistics Overview Stats Contig Audio volume Marker detected him Avo Dev ex 150 100 E ij E ij lur 150 Audio early Hudio late Figure 11 Lipsync tab s Audio volume indicator Audio volume indicator value should be especially observed during the audio markers Marker detected indicator flashes with blue color when the marker is detected Statistics show the minimum maximum average and deviation for lip sync measurements Page 11 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual MONTE RI cul ats Contig Audio volume Marker detected hin Awg Dev eo Jb
6. de mode Page 19 of 22 L OptoFidelity OptoFidelity Video Multimeter User Manual OptoFidelity imaging fidelity experts Figure 21 Firmware upgrade application Page 20 of 22 OptoFidelity 9 Technical specifications External dimensions Operating temperature range Storage temperature range Internal memory Operating time on battery Battery Operating current Built in fiber sensor bandwidth Built in fiber sensor sample rate Trigger output voltage low Trigger output voltage high Trigger output impedance OptoFidelity Video Multimeter User Manual 12x8x3 cm 10 C to 40 C 20 C to 60 C 4 GB 6 hours Li Ion Panasonic PA L2 1950 mAh 7 Wh 300 mA 4 kHz 100 kS s 0 0 Vto 0 4 V 2 9 V to 3 3 V 50 ohm Page 21 of 22 OptoFidelitu OptoFidelity Video Multimeter User Manual 10 Change history Ver Status Date Author Remarks 5 3 2013 7 5 2013 Release 2013Q1 0 27 5 2013 FPS UI file format control option 25 9 2015 m Trigger out option Camera precem a option Page 22 of 22
7. ion cc cece eee e cece renee eee eee e eens nnne nnn nnns 15 6 3 External trigger USAGE sirrimi daina aiiai 15 7 Camera viewfinder latency option c cece cece cece cece cesses esse eee ee nnn nnn nnns 16 7 1 Option license activation ccc cceeeeeeet ee ee eens en neneeeeeeeeeeeeeeeeanenananneeeeeeseges 16 7 2 Camera viewfinder latency measurement setup cece cece cece ener eee eeeeeee 16 7 3 Camera viewfinder latency ME ASUrEMENL cece cssc 17 o SOWA UPAO sede andae OIN ERIT GREMIUM GIC IAE DEG TIED GREMIUM 19 9 Technical specications Cem trei race ae REY a RR Var E Yan 21 10 GE T TOY E o o Em 22 Page 2 of 22 L Optofidelity OptoFidelity Video Multimeter User Manual 1 General information on OptoFidelity Video Multimeter OptoFidelity Video Multimeter is a compact desktop solution for measuring the true and objective video playback performance of mobile tablet or any multimedia device directly from the display It is controlled with a touch display This resistive touch display works best with e g a finger nail or a stylus 2 Start window When power is switched on the device starts and Start Window opens up All installed applications are listed in this window List can be browsed by dragging or with the arrow buttons on the right Measurement tasks Framerate Utilities aystem Information Figure 1 Start window after turning on the device Applications are cla
8. ip sync feature is activated an additional column of results data appears in the results data file The column is named Lip sync ms Measured Lip sync value is printed at each detected k frame black color marker Page 12 of 22 L Optofidelity OptoFidelity Video Multimeter User Manual 4 A B j 1 Recorded at 2000 02 25 00 08 01 using OptoFidelity Video Multimeter Timestamp us Frame time us Color Total dropped frames Lip sync ms 0 52000 k 0 91 52000 18000 y 0 70000 34000 g 0 104000 54000 c 0 386000 52000 b 0 1790000 36000 c 0 1826000 52000 b 0 1878000 35000 p 0 1913000 35000 k 0 97 1948000 54000 y 0 2002000 34000 g 0 Figure 13 Data file saved from frame rate measurement including lip sync 5 USB connection Video Multimeter can be connected to computer by a USB cable for battery charging and data transfer Charging will begin as soon as the USB cable is connected and is indicated by a red LED next to the USB connector When the battery is full the LED will turn off Note that if the device is on the LED will not turn off because power is being used select whether you want to use WISE for data transter or just charge the device While data transfer is actie other functions of the device are disabled Data transter Charge ony Figure 14 USB mode selection screen When the USB cable is connected and the device is on a selection window such as in figure 9 opens
9. ly Page 17 of 22 L OptoFidelity OptoFidelity Video Multimeter User Manual Camera latency alla Avg De dax 155 281 4 81 ao E 3 5 NS Clear Figure 19 Camera latency application showing the measurement statistics The white text value shows the instantaneous most recent latency value Minimum maximum average and standard deviation values are shown as well Page 18 of 22 OptoFidelitu OptoFidelity Video Multimeter User Manual 8 Software update Connect the device with USB cable to the computer to update the software Switch the power on while holding down the button next to power switch by e g a pen Video Multimeter s display shows random noise salt and pepper image Figure 20 Video Multimeter s display showing random noise indicating firmware upgrade mode Device should become visible as a USB DFU device and drivers should be installed automatically Start Firmware upgrade application by computer and click Start button Application informs when the software upgrade is done Finally detach the device from computer and switch it off to exit the upgrade mode If software update is interrupted for some reason you can run the upgrade again as described above Upgrade mode is separate from the main software so damaged software does not prevent upgrading Note When the device is started in the firmware upgrade mode the screen will display random noise Reboot the device to exit the upgra
10. ment The CSV format is supported by e g Microsoft Excel and many other data analysis tools 4 Lip sync measurement option When activated Framerate measurement task shall contain additional tab for Lip sync measurement Lip sync measurement option measures the audio leading lag values in milliseconds Feature requires audio input which is implemented by connecting 3 5mm audio jack to Video Multimeter s Sensor interface Page 9 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual 4 1 Option license activation Lip sync option is activated by copying valid license file into Video Multimeter s SD card License file name is lipsync ini and it should be copied into folder frm license The file contents is as follows an example OptoFidelity Video Multimeter license file Device serial number 5 Feature name lipsync License salt 1706318843 key 2287536893 expire 0 Device serial number must match the physical Video Multimeter device License files are generated by OptoFidelity only License files should not be edited manually 4 2 Audio input cable connection Feature requires an audio input 3 5mm audio jack cable must be connected to Sensor 1 interface NOTE Lip sync feature is activated only if the audio cable was physically connected to Video Multimeter before powering it up Figure 9 Lip sync audio cable connected to Sensor 1 input 4 3 Framerate application s Lip syn
11. mes Figure 4 Frame rate measurement in progress The vertical axis of the graph indicates the time that each frame is on the screen Readings on vertical axis are in milliseconds so for example frame interval of 40 Page 5 of 22 L Optofidelity OptoFidelity Video Multimeter User Manual milliseconds equals to frame rate 1 0 040 25 FPS Dropped frames are shown as red vertical bars if they occur Note To get repeatable results start and stop the measurement in the white period at the start and end of the video Such videos can be generated in OptoFidelity TVG by using setting calibration both After stopping the measurement the results can be studied on the Stats tab or saved using the Save button After saving the results a message window shows the name of the saved file like in figure 5 saved TUL frames to flashfpsz csv Figure 5 Message window after saving the measurement results Page 6 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual 3 2 Statistics tab During or after performing a measurement you can switch to the statistics tab to see further information The view is shown in figure 6 Conf ja Nene lin Avo Dev Max 3b a 3 dd mig Frames Dropped 100 f 3415 Figure 6 Statistics tab The upper row displays the minimum average standard deviation and maximum values of the frame intervals Lower row dis
12. plays the total number of frames and the amount of dropped frames 3 3 Configuration tab By default the application uses RGB marker with built in color calibration This is suitable for most measurement situations with LCD displays For other kinds of displays adjustments on the Config tab may be necessary Page 7 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual Overview stats Marker type RGE 6 color Calbrate RGE Figure 7 Configuration tab As shown in figure 7 the configuration tab allows selection of marker type and color calibration The available marker types are 1 RGB 6 color Marker with specific color sequence of 6 different colors This measures frame intervals and detects dropped frames 2 Black amp White Black and white marker Simple method for testing frame intervals but detecting dropped frames is not possible 3 Any change Any large change of color will be considered as a change of frame Can measure frame intervals of any marker but dropped frames will not be detected The selected marker type must match the type of the marker in the test video used 3 4 Color calibration The functionality of RGB marker depends on the color space of the DUT since RGB marker is based on colors Default settings can be applied for most LCD displays but OLED displays and other display technologies may require calibration You can easily see that calibration is needed if red bars turn
13. ssified according to their purpose e Measurement tasks Measurement applications which are used to determine some feature of the device under test DUT e Utilities General utility programs for using and configuring Video Multimeter Page 3 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual 3 Framerate measurement task The framerate measurement task determines the playback smoothness of the DUT with a test video A blinking marker is measured from the display of device and this marker helps to determine frame intervals and missing frames The basic measurement setup is shown in figure 2 Figure 2 Example of using Video Multimeter for frame rate measurement 3 1 Overview tab When the frame rate measurement application is started it opens to the overview tab shown in figure 3 On this tab you can start and stop measurements have an overview of the results and save them The overview tab shows the average FPS over the whole measurement and the total number of frames Page 4 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual frames To begin a new measurement press the start button The measurement will start immediately and continue until you press the stop button While the measurement is ongoing the graph will scroll to show the results as shown in figure 4 E EMIT c ER fra
14. st cases Medium sensitivity and black white markers are adequate e Backlight filter controls whether the Video Multimeter s automatic backlight compensation is active or not Speeds up the reaction time around ims It is suggested that display brightness is set to 100 if filter is off e Manual trigger pressing this button generates single pulse e g for testing purposes 6 3 External trigger usage External trigger feature is active when the Trigger camera on frames application page is open Other applications like Framerate can be used simultaneously Page 15 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual 7 Camera viewfinder latency option Signal path from digital camera to a display causes always some delay typically between 100 150 milliseconds Less latency is always best but the practical limit for good user experience for sports action photography is somewhere around 200 milliseconds Video Multimeter can be used to measure any camera to display signal path latency These include smartphone cameras tablets pocket cameras and DSLR s Nothing prevents to measure the true end to end latency of IP camera PC setup as well 7 1 Option license activation Camera viewfinder latency option is activated by copying valid license file into Video Multimeter s SD card License file name is viewfinder latency ini and it should be copied into folder frm license The file contents is as follows an e
15. up on the display The window has options Data transfer and Charge only If Data transfer is selected the device will appear as an USB memory on the Page 13 of 22 OptoFidelity OptoFidelity Video Multimeter User Manual computer Other functions of the device will not be available while the data transfer is active Selecting Charge only will simply close the dialog so that the device can be used normally while it is being charged 5 1 USB connection with Remote control API If remote control feature is activated on the device the selection screen has an additional selection select whether you want to use USE for data transfer or just charge the device While data transfer is active other functions of the device are disabled Data transter Control API Charge only Figure 15 USB mode selection screen with Control API feature activated By selecting Control API the device is possible to be remotely controlled via USB Please refer to the Video Multimeter Control Protocol document for further information 6 External trigger output option Video Multimeter can be used to trigger external devices by the External trigger output option The physical BNC connector in the side of the device shall be receive a controlled trigger pulse each time when Video Multimeter detects a frame change 6 1 Option license activation External trigger option is activated by copying valid license file into Video Multimeter s SD card
16. xample OptoFidelity Video Multimeter license file Device serial number 5 Feature name viewfinder latency License salt 1706318843 key 2287536893 expire 0 Device serial number must match the physical Video Multimeter device License files are generated by OptoFidelity only License files should not be edited manually 7 2 Camera viewfinder latency measurement setup The measurement setup is very simple Video Multimeter shows a blinking marker which is captured by the DUT camera DUT display for example camera s viewfinder shows this blinking marker Video Multimeter s fiber is then placed on the viewfinder display at the location of the marker The following picture illustrates a typical setup Page 16 of 22 L Optofidelity OptoFidelity Video Multimeter User Manual Display Video Multimeter Figure 17 Typical setup for measuring camera viewfinder latency 7 3 Camera viewfinder latency measurement The measurement is activated by opening the Camera latency application from the Main menu Camera latency lin Avg De Blax Figure 18 Camera latency application just started Camera latency application starts to blink the marker black white at one second interval Interval is fixed and enables the measurement of max 500 milliseconds latency Pressing Clear button starts a new measurement run Statistics are updated according
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