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    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

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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

  • Revision 63230 : tite pétouille : ajout de deux paramètres au modèle image_legendes ...

    3 juillet 2012, par brunobergot@… — Log

    tite pétouille : ajout de deux paramètres au modèle image_legendes pour permettre de surcharger la liste des extensions autorisées ainsi que le fichier affiché en arrière plan du bloc d’édition des légendes

  • Revision 66490 : retour sur r63230 : générer la bonne échelle quand on utilise un ...

    5 octobre 2012, par brunobergot@… — Log

    retour sur r63230 : générer la bonne échelle quand on utilise un fichier perso pour l’arrière plan du bloc des légendes => maj version

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