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• FFMPEG intermittent failures reading live RTMP stream

  22 janvier 2019, par stevendesu

  The Command

  I’m attempting to read a live RTMP stream and save the result to a file with the following command :

  ffmpeg -re -rtmp_live live -y -i "rtmp://<server>/<app>/<stream>" -c copy -f flv /tmp/dump.flv
  
  </stream></app></server>

  I run this command then after 10-15 seconds I kill the process and check /tmp/dump.flv. I’m trying to do this for stream diagnostic purposes (determine the encoding, bitrate, resolution, pixel format, and key frame interval of the live stream)

  This command works about 25-50% of the time. When it works FFMPEG takes about 5 seconds to connect to the stream, then it begins dumping data to disk. After I kill the process, I can find a couple of megabytes of video data in /tmp/dump.flv which can be probed using ffprobe.

  When the command fails, it goes into one of two failure states :

  Failure State 1

  stderr is flooded with a series of messages about "missing picture in access unit with size X", and the output file /tmp/dump.flv is created but contains 0 bytes

  ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  [NULL @ 0x55b72d568920] pps_id 381 out of range
  
  [AVBSFContext @ 0x55b72d5692c0] Invalid NAL unit 0, skipping.
  
      Last message repeated 1 times
  
  [h264 @ 0x55b72d568920] Invalid NAL unit 0, skipping.
  
      Last message repeated 1 times
  
  [h264 @ 0x55b72d568920] no frame!
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2200
  
  [AVBSFContext @ 0x55b72d5692c0] Invalid NAL unit 0, skipping.
  
      Last message repeated 2 times
  
  [h264 @ 0x55b72d568920] Invalid NAL unit 0, skipping.
  
      Last message repeated 2 times
  
  [h264 @ 0x55b72d568920] no frame!
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 3171
  
  [AVBSFContext @ 0x55b72d5692c0] Invalid NAL unit 0, skipping.
  
  [h264 @ 0x55b72d568920] Invalid NAL unit 0, skipping.
  
  [h264 @ 0x55b72d568920] no frame!
  
  [NULL @ 0x55b72d568920] missing picture in access unit with size 80572
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 1560
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2608
  
  [h264 @ 0x55b72d568920] non-existing PPS 0 referenced
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2734
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2885
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 77739
  
  [h264 @ 0x55b72d568920] non-existing PPS 254 referenced
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 3360
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2804
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 3051
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 3067
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 77693
  
  [h264 @ 0x55b72d568920] non-existing PPS 0 referenced
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2421
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2779
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2442
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2678
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 76877
  
  [h264 @ 0x55b72d568920] sps_id 15 out of range
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 1342
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2412
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 2238
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 3550
  
  [h264 @ 0x55b72d568920] missing picture in access unit with size 3075
  
  ...
  
  (after hitting Ctrl+C:)
  
  Input #0, flv, from 'rtmp://<server>/<app>/<stream>':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
    Duration: 00:00:00.00, start: 5285.919000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Constrained Baseline), yuv420p, 1920x1080, 2543 kb/s, 24 fps, 24 tbr, 1k tbn, 48 tbc
  
  Output #0, flv, to '/tmp/dump.flv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (Constrained Baseline) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080, q=2-31, 2543 kb/s, 24 fps, 24 tbr, 1k tbn, 1k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Exiting normally, received signal 2.
  
  </stream></app></server>

  Failure State 2

  The message "No start code is found." is displayed and FFMPEG immediately terminates after less than a half-second. When this happens the file /tmp/dump.flv is not created.

  ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  [NULL @ 0x56274b0be920] missing picture in access unit with size 3710
  
  [AVBSFContext @ 0x56274b0bf2c0] No start code is found.
  
  rtmp://<server>/<app>/<stream>: could not find codec parameters
  
  Input #0, flv, from 'rtmp://<server>/<app>/<stream>':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
    Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264, none, 2543 kb/s, 24 fps, 1k tbn
  
  Output #0, flv, to '/tmp/dump.flv':
  
  Output file #0 does not contain any stream
  
  </stream></app></server></stream></app></server>

  What I’ve tried

  • Adding or removing -re to try and limit the input frame rate to the source frame rate
  • Adding or removing -rtmp_live live
  • Adding or removing -timeout 5 (or any other timeout value)
  • Using RTMP URL parameters (e.g. -i "rtmp://<server>/<app>/<stream> live=1 timeout=5"</stream></app></server>)

  Does anyone know why this command’s success is so intermittent or how I can get more consistent results ?

  Alternate Acceptable Solution

  The only reason I’m using ffmpeg to dump the stream to a temporary file at all is because I plan to perform multiple tests on the file (at least two at the moment — one to get the encoding, and another to get the key frame interval). By downloading the stream I reduce bandwidth usage and reduce runtime. However it’s perfectly acceptable to forego ffmpeg and just use ffprobe directly on the RTMP URL if this would help.

  Note that I did try this and I get the same two failure states with ffprobe

• How do I fix my stream errors on ffmpeg (ac3) and (h264)

  8 octobre 2018, par Mic

  I recently learned how to transcode a stream using FFMPEG, the stream itself works fine for a moment, then it buffers, freezes, pixelation etc. I’m curious if fixing the errors will resolve this problem.

  My commands are :

  FFmpeg -i udp://... -f mpegts -b:v 50M -udp://....ts 

  The error is :

  [ac3 @00000216e3b98140] left block unavailable for required requested..

• Revision 101593 : utiliser les fonctions standard objets de SPIP 3+ plutot que les ...

  9 janvier 2017, par cedric@… — Log

  utiliser les fonctions standard objets de SPIP 3+ plutot que les inclusoons inc-notation-preferee-xx qui ne sont pas generiques. Corrige aussi le bug d’affichage quand l’objet n’existe plus en base (td qui manquait dans les tableaux).
  On laisse les squelettes modeles/inc-notation-preferee-xxx pour le moment, pour ne pas casser des appels existants, a supprimer dans un upgrade majeur