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• ffmpeg faster conversion from jpg files to mp4

  25 mai 2021, par opensw

  I am trying (on Android and iOS) to convert 500 jpeg files into a mp4 video ; everything is working but the conversion time is too huge, around 1 minute. I have some constraints : the video should be playable by the native Android/iOS player then I cannot use the option '-codec copy' and then generates a mkv or mp4 containers of the original jpeg files (the conversion time in this case is around 1s !). After many attempts, the best solution is the default one without almost any options :D Is there a way to improve the conversion time of the following command ?

  


  ffmpeg -r 30 -I inputPath/%05d.jpg -y -threads 0 -r 30 + outputFilePath.mp4


  


  I have tried :

  


  

  1. -q:v 2 (but I would like to keep the original resolution, it is slower than the above command)

  


  2. -vf scale=-2:720 (but I would like to keep the original resolution, it is comparable to the above command)

  


  3. -s hd720 (but I would like to keep the original resolution, it is comparable to the above command)

  


  4. -threads 128 (does not change anything)

  


  5. -c:v libx264 -crf 23 -preset ultrafast, this one is painfully slow

  


  


  Output log

  


   LOG  Async FFmpeg process started with executionId 3001 for file:///data/user/0/com.xxx.xxx/files/events/1/1/raw.
 LOG  ffmpeg version v4.4-dev-416
 LOG   Copyright (c) 2000-2020 the FFmpeg developers
 LOG  
 LOG    built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
 LOG    configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android21-clang --cxx=aarch64-linux-android21-clang++ --extra-libs='-L/storage/light/projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-sdl2 --enable-zlib --enable-mediacodec
 LOG    libavutil      56. 55.100 / 56. 55.100
 LOG    libavcodec     58. 96.100 / 58. 96.100
 LOG    libavformat    58. 48.100 / 58. 48.100
 LOG    libavdevice    58. 11.101 / 58. 11.101
 LOG    libavfilter     7. 87.100 /  7. 87.100
 LOG    libswscale      5.  8.100 /  5.  8.100
 LOG    libswresample   3.  8.100 /  3.  8.100
 LOG  Input #0, image2, from 'file:///data/user/0/com.xxx.xxx/files/events/1/1/raw/%05d.jpg':
 LOG    Duration:
 LOG  00:00:18.08
 LOG  , start:
 LOG  0.000000
 LOG  , bitrate:
 LOG  N/A
 LOG  
 LOG      Stream #0:0
 LOG  : Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9]
 LOG  ,
 LOG  25 fps,
 LOG  25 tbr,
 LOG  25 tbn,
 LOG  25 tbc
 LOG  
 LOG  Stream mapping:
 LOG    Stream #0:0 -> #0:0
 LOG   (mjpeg (native) -> mpeg4 (native))
 LOG  
 LOG  Press [q] to stop, [?] for help
 LOG  [graph 0 input from stream 0:0 @ 0x7c5f870800] sws_param option is deprecated and ignored
 LOG  [swscaler @ 0x7bed4d6a40] deprecated pixel format used, make sure you did set range correctly
 LOG  Output #0, mp4, to 'file:///data/user/0/com.xxx.xxx/files/events/1/1/preview.mp4':
 LOG    Metadata:
 LOG      encoder         :
 LOG  Lavf58.48.100
 LOG  
 LOG      Stream #0:0
 LOG  : Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s
 LOG  ,
 LOG  30 fps,
 LOG  15360 tbn,
 LOG  30 tbc
 LOG  
 LOG      Metadata:
 LOG        encoder         :
 LOG  Lavc58.96.100 mpeg4
 LOG  
 LOG      Side data:
 LOG  
 LOG  cpb:
 LOG  bitrate max/min/avg: 0/0/200000 buffer size: 0
 LOG  vbv_delay: N/A
 LOG  
 LOG  frame=    5 fps=0.0 q=6.2 size=     256kB time=00:00:00.13 bitrate=15723.7kbits/s speed=0.21x
 LOG  frame=   10 fps=8.3 q=13.8 size=     256kB time=00:00:00.30 bitrate=6990.2kbits/s speed=0.25x
 LOG  frame=   16 fps=9.0 q=31.0 size=     256kB time=00:00:00.50 bitrate=4194.5kbits/s speed=0.283x
 LOG  frame=   22 fps=9.3 q=31.0 size=     256kB time=00:00:00.70 bitrate=2996.2kbits/s speed=0.297x
 LOG  frame=   28 fps=9.5 q=31.0 size=     256kB time=00:00:00.90 bitrate=2330.4kbits/s speed=0.307x
 LOG  frame=   34 fps=9.6 q=31.0 size=     256kB time=00:00:01.10 bitrate=1906.7kbits/s speed=0.312x
 LOG  frame=   40 fps=9.7 q=31.0 size=     256kB time=00:00:01.30 bitrate=1613.4kbits/s speed=0.316x
 LOG  frame=   45 fps=9.7 q=31.0 size=     256kB time=00:00:01.46 bitrate=1430.1kbits/s speed=0.317x
 LOG  frame=   50 fps=9.7 q=31.0 size=     256kB time=00:00:01.63 bitrate=1284.1kbits/s speed=0.318x
 LOG  frame=   56 fps=9.8 q=31.0 size=     256kB time=00:00:01.83 bitrate=1144.1kbits/s speed=0.319x
 LOG  frame=   61 fps=9.8 q=31.0 size=     256kB time=00:00:02.00 bitrate=1048.7kbits/s speed=0.32x
 LOG  frame=   67 fps=9.8 q=31.0 size=     256kB time=00:00:02.20 bitrate= 953.4kbits/s speed=0.322x
 LOG  frame=   72 fps=9.8 q=31.0 size=     256kB time=00:00:02.36 bitrate= 886.2kbits/s speed=0.322x
 LOG  frame=   78 fps=9.8 q=31.0 size=     512kB time=00:00:02.56 bitrate=1634.2kbits/s speed=0.323x
 LOG  frame=   84 fps=9.8 q=31.0 size=     512kB time=00:00:02.76 bitrate=1516.1kbits/s speed=0.324x
 LOG  frame=   90 fps=9.9 q=31.0 size=     512kB time=00:00:02.96 bitrate=1413.9kbits/s speed=0.325x
 LOG  frame=   95 fps=9.9 q=31.0 size=     512kB time=00:00:03.13 bitrate=1338.7kbits/s speed=0.325x
 LOG  frame=  101 fps=9.9 q=24.8 size=     512kB time=00:00:03.33 bitrate=1258.4kbits/s speed=0.326x
 LOG  frame=  107 fps=9.9 q=31.0 size=     512kB time=00:00:03.53 bitrate=1187.1kbits/s speed=0.327x
 LOG  frame=  113 fps=9.9 q=24.8 size=     512kB time=00:00:03.73 bitrate=1123.5kbits/s speed=0.327x
 LOG  frame=  119 fps=9.9 q=31.0 size=     512kB time=00:00:03.93 bitrate=1066.4kbits/s speed=0.328x
 LOG  frame=  125 fps=9.9 q=24.8 size=     512kB time=00:00:04.13 bitrate=1014.8kbits/s speed=0.328x
 LOG  frame=  131 fps=9.9 q=31.0 size=     512kB time=00:00:04.33 bitrate= 968.0kbits/s speed=0.328x
 LOG  frame=  137 fps=9.9 q=24.8 size=     512kB time=00:00:04.53 bitrate= 925.3kbits/s speed=0.329x
 LOG  frame=  142 fps=9.9 q=31.0 size=     512kB time=00:00:04.70 bitrate= 892.5kbits/s speed=0.329x
 LOG  frame=  148 fps=9.9 q=31.0 size=     512kB time=00:00:04.90 bitrate= 856.0kbits/s speed=0.329x
 LOG  frame=  153 fps=9.9 q=31.0 size=     512kB time=00:00:05.06 bitrate= 827.9kbits/s speed=0.329x
 LOG  frame=  159 fps= 10 q=31.0 size=     512kB time=00:00:05.26 bitrate= 796.4kbits/s speed=0.33x
 LOG  frame=  165 fps= 10 q=31.0 size=     512kB time=00:00:05.46 bitrate= 767.3kbits/s speed=0.33x
 LOG  frame=  171 fps= 10 q=31.0 size=     512kB time=00:00:05.66 bitrate= 740.2kbits/s speed=0.33x
 LOG  frame=  177 fps= 10 q=31.0 size=     768kB time=00:00:05.86 bitrate=1072.5kbits/s speed=0.331x
 LOG  frame=  183 fps= 10 q=31.0 size=     768kB time=00:00:06.06 bitrate=1037.1kbits/s speed=0.331x
 LOG  frame=  188 fps= 10 q=31.0 size=     768kB time=00:00:06.23 bitrate=1009.4kbits/s speed=0.331x
 LOG  frame=  193 fps= 10 q=31.0 size=     768kB time=00:00:06.40 bitrate= 983.1kbits/s speed=0.331x
 LOG  frame=  199 fps= 10 q=31.0 size=     768kB time=00:00:06.60 bitrate= 953.3kbits/s speed=0.331x
 LOG  frame=  204 fps= 10 q=31.0 size=     768kB time=00:00:06.76 bitrate= 929.8kbits/s speed=0.331x
 LOG  frame=  210 fps= 10 q=31.0 size=     768kB time=00:00:06.96 bitrate= 903.1kbits/s speed=0.331x
 LOG  frame=  216 fps= 10 q=31.0 size=     768kB time=00:00:07.16 bitrate= 877.9kbits/s speed=0.331x
 LOG  frame=  221 fps= 10 q=24.8 size=     768kB time=00:00:07.33 bitrate= 858.0kbits/s speed=0.331x
 LOG  frame=  227 fps= 10 q=31.0 size=     768kB time=00:00:07.53 bitrate= 835.2kbits/s speed=0.331x
 LOG  frame=  232 fps= 10 q=31.0 size=     768kB time=00:00:07.70 bitrate= 817.1kbits/s speed=0.331x
 LOG  frame=  238 fps= 10 q=31.0 size=     768kB time=00:00:07.90 bitrate= 796.4kbits/s speed=0.332x
 LOG  frame=  243 fps= 10 q=31.0 size=     768kB time=00:00:08.06 bitrate= 780.0kbits/s speed=0.332x
 LOG  frame=  249 fps= 10 q=31.0 size=     768kB time=00:00:08.26 bitrate= 761.1kbits/s speed=0.332x
 LOG  frame=  254 fps= 10 q=31.0 size=     768kB time=00:00:08.43 bitrate= 746.1kbits/s speed=0.332x
 LOG  frame=  259 fps= 10 q=31.0 size=    1024kB time=00:00:08.60 bitrate= 975.5kbits/s speed=0.332x
 LOG  frame=  264 fps= 10 q=31.0 size=    1024kB time=00:00:08.76 bitrate= 956.9kbits/s speed=0.332x
 LOG  frame=  270 fps= 10 q=31.0 size=    1024kB time=00:00:08.96 bitrate= 935.6kbits/s speed=0.332x
 LOG  frame=  276 fps= 10 q=31.0 size=    1024kB time=00:00:09.16 bitrate= 915.2kbits/s speed=0.332x
 LOG  frame=  282 fps= 10 q=31.0 size=    1024kB time=00:00:09.36 bitrate= 895.6kbits/s speed=0.332x
 LOG  frame=  288 fps= 10 q=31.0 size=    1024kB time=00:00:09.56 bitrate= 876.9kbits/s speed=0.332x
 LOG  frame=  294 fps= 10 q=31.0 size=    1024kB time=00:00:09.76 bitrate= 858.9kbits/s speed=0.333x
 LOG  frame=  299 fps= 10 q=31.0 size=    1024kB time=00:00:09.93 bitrate= 844.5kbits/s speed=0.332x
 LOG  frame=  305 fps= 10 q=24.8 size=    1024kB time=00:00:10.13 bitrate= 827.9kbits/s speed=0.332x
 LOG  frame=  310 fps= 10 q=31.0 size=    1024kB time=00:00:10.30 bitrate= 814.5kbits/s speed=0.332x
 LOG  frame=  316 fps= 10 q=31.0 size=    1024kB time=00:00:10.50 bitrate= 798.9kbits/s speed=0.332x
 LOG  frame=  321 fps= 10 q=31.0 size=    1024kB time=00:00:10.66 bitrate= 786.5kbits/s speed=0.332x
 LOG  frame=  327 fps= 10 q=31.0 size=    1024kB time=00:00:10.86 bitrate= 772.0kbits/s speed=0.333x
 LOG  frame=  332 fps= 10 q=31.0 size=    1024kB time=00:00:11.03 bitrate= 760.3kbits/s speed=0.332x
 LOG  frame=  338 fps= 10 q=31.0 size=    1024kB time=00:00:11.23 bitrate= 746.8kbits/s speed=0.332x
 LOG  frame=  344 fps= 10 q=31.0 size=    1024kB time=00:00:11.43 bitrate= 733.7kbits/s speed=0.333x
 LOG  frame=  350 fps= 10 q=31.0 size=    1280kB time=00:00:11.63 bitrate= 901.4kbits/s speed=0.333x
 LOG  frame=  355 fps= 10 q=31.0 size=    1280kB time=00:00:11.80 bitrate= 888.6kbits/s speed=0.333x
 LOG  frame=  361 fps= 10 q=31.0 size=    1280kB time=00:00:12.00 bitrate= 873.8kbits/s speed=0.333x
 LOG  frame=  367 fps= 10 q=31.0 size=    1280kB time=00:00:12.20 bitrate= 859.5kbits/s speed=0.333x
 LOG  frame=  373 fps= 10 q=31.0 size=    1280kB time=00:00:12.40 bitrate= 845.6kbits/s speed=0.333x
 LOG  frame=  379 fps= 10 q=31.0 size=    1280kB time=00:00:12.60 bitrate= 832.2kbits/s speed=0.333x
 LOG  frame=  385 fps= 10 q=31.0 size=    1280kB time=00:00:12.80 bitrate= 819.2kbits/s speed=0.333x
 LOG  frame=  391 fps= 10 q=31.0 size=    1280kB time=00:00:13.00 bitrate= 806.6kbits/s speed=0.334x
 LOG  frame=  397 fps= 10 q=31.0 size=    1280kB time=00:00:13.20 bitrate= 794.4kbits/s speed=0.334x
 LOG  frame=  403 fps= 10 q=31.0 size=    1280kB time=00:00:13.40 bitrate= 782.5kbits/s speed=0.334x
 LOG  frame=  409 fps= 10 q=31.0 size=    1280kB time=00:00:13.60 bitrate= 771.0kbits/s speed=0.334x
 LOG  frame=  415 fps= 10 q=31.0 size=    1280kB time=00:00:13.80 bitrate= 759.9kbits/s speed=0.334x
 LOG  frame=  421 fps= 10 q=31.0 size=    1280kB time=00:00:14.00 bitrate= 749.0kbits/s speed=0.334x
 LOG  frame=  426 fps= 10 q=31.0 size=    1280kB time=00:00:14.16 bitrate= 740.2kbits/s speed=0.334x
 LOG  frame=  432 fps= 10 q=31.0 size=    1280kB time=00:00:14.36 bitrate= 729.9kbits/s speed=0.334x
 LOG  frame=  438 fps= 10 q=31.0 size=    1536kB time=00:00:14.56 bitrate= 863.8kbits/s speed=0.334x
 LOG  frame=  444 fps= 10 q=31.0 size=    1536kB time=00:00:14.76 bitrate= 852.1kbits/s speed=0.334x
 LOG  frame=  449 fps= 10 q=24.8 size=    1536kB time=00:00:14.93 bitrate= 842.6kbits/s speed=0.334x
 LOG  frame=  452 fps= 10 q=31.0 Lsize=    1592kB time=00:00:15.03 bitrate= 867.5kbits/s speed=0.334x
 LOG  video:1589kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
 LOG  0.176061%
 LOG  FFmpeg process completed successfully for file:///data/user/0/com.xxx.xxx/files/events/1/1/raw


  


• FFMPEG/DASH-LL creates audio and video chunks at different rates ; player is confused (404 errors)

  26 mai 2021, par Danny

  I'm trying to create a MPEG-DASH "live" stream from a static file to test various low latency modes. The DASH muxer in FFmpeg creates two AdaptationSets, one for video chunks and one for audio chunks.

  


  However, the audio and video chunk files are not created at the same rate (should they be ?). ie, here stream0 are the video chunks and stream1 are the audio chunks. After a few seconds of running, the webroot directory contains :

  


  chunk-stream0-00001.m4s  chunk-stream1-00001.m4s  
chunk-stream0-00002.m4s  chunk-stream1-00002.m4s  
chunk-stream0-00003.m4s  chunk-stream1-00003.m4s  
chunk-stream0-00004.m4s  chunk-stream1-00004.m4s  
                         chunk-stream1-00005.m4s  
                         chunk-stream1-00006.m4s  
                         chunk-stream1-00007.m4s  
                         chunk-stream1-00008.m4s  
                         chunk-stream1-00009.m4s  
master.mpd  
init-stream0.m4s  
init-stream1.m4s  


  


  The stream doesn't load (or play) on either dash.js or shaka-player and there are lots of 404 (Not Found) errors for the video chunks. The player is requesting chunks from both stream0 and stream1 in sequence, ie, stream0-001 + stream1-001, then stream0-002 + stream1-002 and so on.

  


  But since stream0 only goes from 001 to 004, there are lots of 404 errors as it tries to load stream0-005 through 009.

  


  The gap gets wider after letting FFmpeg run for a while. eg, stream0 is 62 to 75 but stream1 is 174 to 187. Reloading the player page at this point fails with dash.all.debug.js:15615 [2055][FragmentController] No video bytes to push or stream is inactive. and shows 404 errors stream0 chunk 188 (which doesn't exist yet !)

  


  

  


  The FFmpeg command was adopted from DASH streaming from the top-down :

  


  ffmpeg -re -i /mnt/swdevel/TestStreams/H264/ThreeHourMovie.mp4 \
-c:v libx264 -x264-params keyint=120:scenecut=0 -b:v 1M -c:a copy \
-f dash -dash_segment_type mp4 \
 -seg_duration 2 \
 -target_latency 3 \
 -frag_type duration \
 -frag_duration 0.2 \
 -window_size 10 \
 -extra_window_size 3 \
 -streaming 1 \
 -ldash 1 \
 -use_template 1 \
 -use_timeline 0 \
 -write_prft 1 \
 -fflags +nobuffer+flush_packets \
 -format_options "movflags=+cmaf" \
 -utc_timing_url "/pelican/testPlayers/time.php" \
 master.mpd


  


  And the dash.js player code is very simple :

  


  const srcUrl = "../ottWebRoot/playerTest/master.mpd"; 

var player = dashjs.MediaPlayer().create();

let autoPlay = false;
player.initialize(document.querySelector("#videoTagId"), srcUrl, autoPlay);

player.updateSettings(
{
    streaming :
    {
        lowLatencyEnabled : true,
        liveDelay : 2,
        jumpGaps : true,
        jumpLargeGaps : true,
        smallGapLimit : 1.5,
    }
});


  


  To provide the UTCTiming element in the manifest, the small time.php URL returns a UTC time from the web server :

  


  <?php
    print gmdate("Y-m-d\TH:i:s\Z");
?>


  


  (It also shows 404 errors for the latest stream1/audio chunk, that's likely a different problem)

  


  I'm not sure what to try next. Any and suggestions greatly appreciated.

  


  EDIT I

  


  The suggestion by @Anonymous Coward to change the key interval improved things a lot. The chunks for stream0 and stream1 are in lock-step and have identical sequence numbers.

  


  However, there are still many 404 errors, both on initial page load (without pressing play) and during playback.

  


  I ran watch -n 1 ls -lt code> and compared side-by-side to the errors in the browser console.  It&#x27;s hard to compare but it <em>looks</em> like the browser is trying to fetch files "on the play edge" which haven&#x27;t yet been created by FFmpeg.  See the pic below.

  


  How do I instruct the browser to wait just a bit more before fetching the edge chunks ?

  


  

  


  EDIT II

  


  Using shaka-player instead of dash.js plays properly without 404 errors. Configured as :

  


      player.configure(
    {
        streaming: 
        {
            lowLatencyMode: true,
            inaccurateManifestTolerance: 0,
            rebufferingGoal: 0.1,
        }
        
    });


  


  Client

  


  

  • MacOS 10.12

  


  • dash.js latest 3.2.2

  


  • Chrome 79, Safari 12, FireFox v ?

  


  


  Server

  


  

  • Apache 2.4.37

  


  • PHP 7.2.4 (for time function only)

  


  • Centos 8

  


  


  (For reference, here is the mpd file generated by FFmpeg)

  


  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="dynamic" minimumupdateperiod="PT500S" availabilitystarttime="2021-05-24T14:50:00.263Z" publishtime="2021-05-24T15:22:45.335Z" timeshiftbufferdepth="PT50.0S" maxsegmentduration="PT2.0S" minbuffertime="PT5.0S">&#xA;    <programinformation>&#xA;    </programinformation>&#xA;    <servicedescription>&#xA;        <latency target="3000" referenceid="0"></latency>&#xA;    </servicedescription>&#xA;    <period start="PT0.0S">&#xA;        <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="24/1" maxwidth="1280" maxheight="682" par="15:8" lang="und">&#xA;            <resync dt="200000" type="0"></resync>&#xA;            <representation mimetype="video/mp4" codecs="avc1.64081f" bandwidth="1000000" width="1280" height="682" sar="1023:1024">&#xA;                <producerreferencetime inband="true" type="captured" wallclocktime="2021-05-24T14:50:00.263Z" presentationtime="0">&#xA;                    <utctiming schemeiduri="urn:mpeg:dash:utc:http-xsdate:2014" value="/pelican/testPlayers/time.php"></utctiming>&#xA;                </producerreferencetime>&#xA;                <resync dt="5000000" type="1"></resync>&#xA;                <segmenttemplate timescale="1000000" duration="2000000" availabilitytimeoffset="1.800" availabilitytimecomplete="false" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;        <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="und">&#xA;            <resync dt="200000" type="0"></resync>&#xA;            <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="116317" audiosamplingrate="48000">&#xA;                <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>&#xA;                <producerreferencetime inband="true" type="captured" wallclocktime="2021-05-24T14:50:00.306Z" presentationtime="0">&#xA;                    <utctiming schemeiduri="urn:mpeg:dash:utc:http-xsdate:2014" value="/pelican/testPlayers/time.php"></utctiming>&#xA;                </producerreferencetime>&#xA;                <resync dt="21333" type="1"></resync>&#xA;                <segmenttemplate timescale="1000000" duration="2000000" availabilitytimeoffset="1.800" availabilitytimecomplete="false" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">&#xA;                </segmenttemplate>&#xA;            </representation>&#xA;        </adaptationset>&#xA;    </period>&#xA;    <utctiming schemeiduri="urn:mpeg:dash:utc:http-xsdate:2014" value="/pelican/testPlayers/time.php"></utctiming>&#xA;</mpd>&#xA;

  


• Netflix neutrality

  31 mai 2014, par Mans — Law and liberty

  In the net neutrality debate, a rarely mentioned aspect is the widespread practice amongst ISPs of over-subscribing bandwidth. Before streaming video became readily available and popular, this was viable, even reasonable, since few users managed to actually saturate their links for extended periods of time. Now that customers are suddenly … Continue reading →