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  • Keeping control of your media in your hands

    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 (...)

  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

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  • FFmpeg audio channel rematrix (5.1 to stereo)

    29 octobre 2014, par Flock Dawson

    I’ve got a (very large !) Apple ProRes 422 file with 16ch audio. To be able to use it on a less powerful computer, I’d like to convert it to a standard MP4 file (h264 video codec, stereo audio). The original file has 16 channels of audio, however, and FFmpeg gives an error when I try to convert it (’Rematrix is needed’). How do I do rematrixing of audio channels ? Are there additional steps needed ?

    This is the FFmpeg command I used :

    ffmpeg -y -i Capture0000.mov -vcodec libx264 -vb 2000k -pix_fmt yuv420p -coder 0 -profile:v baseline -acodec libfaac -ab 128k /tmp/out.mp4

    This is the FFmpeg output :

    ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
    
      built on May  8 2014 14:17:45 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
      configuration: --prefix=/usr/local/ffmpeg_build --extra-cflags=-I/usr/local/ffmpeg_build/include --extra-ldflags=-L/usr/local/ffmpeg_build/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab --enable-libxvid --enable-libfaac
    
      libavutil      52. 81.100 / 52. 81.100
    
      libavcodec     55. 60.103 / 55. 60.103
    
      libavformat    55. 37.102 / 55. 37.102
    
      libavdevice    55. 13.101 / 55. 13.101
    
      libavfilter     4.  5.100 /  4.  5.100
    
      libswscale      2.  6.100 /  2.  6.100
    
      libswresample   0. 18.100 /  0. 18.100
    
      libpostproc    52.  3.100 / 52.  3.100
    
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Capture0000.mov':
    
      Metadata:
    
        creation_time   : 2014-08-17 18:30:31
    
      Duration: 01:01:22.52, start: 0.000000, bitrate: 202001 kb/s
    
        Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080, 183513 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
    
        Metadata:
    
          creation_time   : 2014-08-17 18:30:31
    
          handler_name    : Apple Alias Data Handler
    
          encoder         : Apple ProRes 422 (HQ)
    
        Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32, 18432 kb/s (default)
    
        Metadata:
    
          creation_time   : 2014-08-17 18:30:31
    
          handler_name    : Apple Alias Data Handler
    
    [auto-inserted resampler 0 @ 0x3943da0] [SWR @ 0x39441a0] Rematrix is needed between 16 channels and 5.1 but there is not enough information to do it
    
    [auto-inserted resampler 0 @ 0x3943da0] Failed to configure output pad on auto-inserted resampler 0
    
    Error opening filters!

    This is the FFprobe output :

    ffprobe version 2.2.git Copyright (c) 2007-2014 the FFmpeg developers
    
  built on May  8 2014 14:17:45 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
  configuration: --prefix=/usr/local/ffmpeg_build --extra-cflags=-I/usr/local/ffmpeg_build/include --extra-ldflags=-L/usr/local/ffmpeg_build/lib --bindir=/usr/local/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab --enable-libxvid --enable-libfaac
    
  libavutil      52. 81.100 / 52. 81.100
    
  libavcodec     55. 60.103 / 55. 60.103
    
  libavformat    55. 37.102 / 55. 37.102
    
  libavdevice    55. 13.101 / 55. 13.101
    
  libavfilter     4.  5.100 /  4.  5.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Capture0000.mov':
    
  Metadata:
    
    creation_time   : 2014-08-17 18:30:31
    
  Duration: 01:01:22.52, start: 0.000000, bitrate: 202001 kb/s
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080, 183513 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
    
    Metadata:
    
      creation_time   : 2014-08-17 18:30:31
    
      handler_name    : Apple Alias Data Handler
    
      encoder         : Apple ProRes 422 (HQ)
    
    Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32, 18432 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-08-17 18:30:31
    
      handler_name    : Apple Alias Data Handler

  • movenc : Add a flag for using default-base-is-moof in tfhd atoms

    29 octobre 2014, par Martin Storsjö
    movenc : Add a flag for using default-base-is-moof in tfhd atoms

    Similarly to the omit_tfhd_offset flag added in e7bf085b, this
    
avoids writing absolute byte positions to the file, making them
    
more easily streamable.
    

    This is a new feature from 14496-12:2012, so application support
    
isn’t necessarily too widespread yet (support for it in libav was
    
added in 20f95f21f in July 2014).
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DBH] doc/muxers.texi
    • [DBH] libavformat/movenc.c
    • [DBH] libavformat/movenc.h
    • [DBH] libavformat/version.h

  • Minimize PCR Jitter in mpegts stream

    30 octobre 2014, par Anil

    I am using ffmpeg for capturing desktop screen and creating mpegts stream. I am using following command.

    ffmpeg -y -loglevel warning -f alsa -ac 2 -i pulse -f x11grab -s `xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -i :0.0 -r 25 -g 12 -flags +ildct+ilme -top 1 -vcodec mpeg2video -b:v 2M -minrate 2M -maxrate 2M -bufsize 4M -muxrate 4M -pix_fmt yuv420p -acodec mp2 -ac 2 -b:a 128k -ar 48000 -aspect 4:3 -mpegts_original_network_id 0x0001 -mpegts_transport_stream_id 0x0003  -mpegts_service_id 0x0004 -mpegts_pmt_start_pid 0x0030 -mpegts_start_pid 0x0500 -metadata service_provider="TEST01" -metadata service_name="test01" -f mpegts  "udp://227.40.50.60:1234?pkt_size=1316"

    In output video I am getting PCR jitter 65.000ms-78.782ms. I need to minimize PCR Jitter to less than 0.1ms. Any idea, how to solve this problem ?

    • OS version : Fedoa 19
    • Kernel ver : 3.9.5-301.fc19.i686
    • ffmpeg ver :
      ffmpeg version 2.2.4 Copyright (c) 2000-2014 the FFmpeg developers
      built on Jul 14 2014 14:03:29 with gcc 4.8.1 (GCC) 20130603 (Red Hat 4.8.1-1)
      configuration : —extra-libs=-ldl —enable-gpl —enable-nonfree —enable-libfdk_aac —enable-libvpx —enable-x11grab —enable-libpulse —enable-libx264
      libavutil 52. 66.100 / 52. 66.100
      libavcodec 55. 52.102 / 55. 52.102
      libavformat 55. 33.100 / 55. 33.100
      libavdevice 55. 10.100 / 55. 10.100
      libavfilter 4. 2.100 / 4. 2.100
      libswscale 2. 5.102 / 2. 5.102
      libswresample 0. 18.100 / 0. 18.100
      libpostproc 52. 3.100 / 52. 3.100

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