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  • Gestion générale des documents

    13 mai 2011, par

    MédiaSPIP ne modifie jamais le document original mis en ligne.
    Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
    Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (7014)

  • Revision 0d0ed6a29b : Allow sub8x8 intra modes test for alt frame coding This commit allows sub8x8 in

    5 octobre 2013, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_onyx_if.c



    Allow sub8x8 intra modes test for alt frame coding

    This commit allows sub8x8 intra modes test in the rate-distortion
    loop for hd sequences in speed 1 and 2.

    For sequence y90n of hd set at 8000 kbps, speed 2 runtime goes
    from 207s to 210s. For ped_1080p at 3000 kbps, speed 2 runtim goes
    from 336s to 337s. Both are running with 300 frames.

    This improves compression performance by 0.24% for stdhd and 0.32%
    for hd.

    Change-Id : I173ca38a6411565ae6cfadd184c42b2070c5de1f

  • Converting DVD image with subtitles to MKV using avconv

    16 janvier 2016, par Carlos Eugenio Thompson Pinzón

    This is the procedure I know to convert a DVD image to another videoformat (v.g. MP4) :

    1. concatenate the VTS_01_n.VOB files inside VIDEO_TS folder (for n >= 0) into a single VOB file.
    2. use avconv or ffmpeg in order to convert that VOB into another format.

    So far so good, however now I want to convert the DVD image with the subtitles. As far as I know the MKV format supports subtitles, so it seems an obvious choice. Alternatively I might use any other format with hard subtitles (subtitles as part of the video image).

    However, the subtitle encoding in the DVD image is dvdsub and I get the following error

    Only SUBTITLE_ASS type supported.
    
Subtitle encoding failed

    However, when running avconv -codecs I get :

    ...
    
 DES    dvdsub          DVD subtitles
    
...

    And the -c:s copy switch, while it prevents the command to fail, it does not seem to produce a subtitle that the player can understand.

    So, how can I create ass subtitles from dvdsub using avconv ?

    My VOB file has eight subtitle channels and two audio channels. The Ubuntu video app does not show any subtitles, and only the first audio channel seems to be working, do the DVD image might be broken.

    Another file, for a double-layer DVD, displays the Subtitle encoding error, however when using the -c:s copy switch it further displays :

    Application provided invalid, non monotonically increasing dts to muxer in stream 2: 49 >= 49
    
av_interleaved_write_frame(): Invalid argument

    Thank you in advance for any ideas on how to solve these problems.

    (I am using Ubuntu where ffmpeg is an alias for avconv. I know it is possible to install the real ffmpeg but so far I have not done so.)

    update : commands and console outputs :

    commands

    cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB VTS_01_4.VOB VTS_01_5.VOB > ~/temp/mymovie.VOB
    
cd ~/temp
    
avconv -i mymovie.VOB

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0x1a64d40] max_analyze_duration reached
    
Input #0, mpeg, from 'mymovie.VOB':
    
  Duration: 00:00:01.95, start: 0.280633, bitrate: -2147483 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 7500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
At least one output file must be specified

    command

    avconv -i mymovie.VOB mymovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0x1cdad40] max_analyze_duration reached
    
Input #0, mpeg, from 'mymovie.VOB':
    
  Duration: 00:00:01.95, start: 0.280633, bitrate: -2147483 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 7500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
File 'mymovie.mkv' already exists. Overwrite ? [y/N] y
    
[buffer @ 0x1ce23c0] w:720 h:480 pixfmt:yuv420p
    
Output #0, matroska, to 'mymovie.mkv':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: mpeg4, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 29.97 tbc
    
    Stream #0.1: Audio: libvorbis, 48000 Hz, 5.1, s16
    
    Stream #0.2: Subtitle: ass, 200 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
    
  Stream #0:9 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:1 -> #0:2 (dvdsub -> ass)
    
Press ctrl-c to stop encoding
    
[ass @ 0x1ce0140] Only SUBTITLE_ASS type supported.
    
Subtitle encoding failed

    command

    avconv -i mymovie.VOB -c:s copy mymovie.mkv

    output omitted.

    command

    avconv -i mymovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[matroska,webm @ 0xbc1d40] Estimating duration from bitrate, this may be inaccurate
    
Input #0, matroska,webm, from 'mymovie.mkv':
    
  Metadata:
    
    ENCODER         : Lavf53.21.1
    
  Duration: 01:05:09.47, start: 0.000000, bitrate: N/A
    
    Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 30k tbc (default)
    
    Stream #0.1: Audio: vorbis, 48000 Hz, 5.1, s16 (default)
    
    Stream #0.2: Subtitle: dvdsub (default)
    
At least one output file must be specified

    Now, for the double-layer :
    commands

    cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB VTS_01_4.VOB VTS_01_5.VOB VTS_01_6.VOB VTS_01_7.VOB VTS_01_8.VOB > ~/temp/mylongmovie.VOB
    
cd ~/temp
    
avconv -i mylongmovie.VOB mylongmovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0x13c2d40] max_analyze_duration reached
    
Input #0, mpeg, from 'Cosmos-0203.VOB':
    
  Duration: 00:00:30.24, start: 0.280633, bitrate: 2103365 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 8000 kb/s, 27.46 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
File 'mylongmovie.mkv' already exists. Overwrite ? [y/N] y
    
[buffer @ 0x13ca3c0] w:720 h:480 pixfmt:yuv420p
    
Output #0, matroska, to 'mylongmovie.mkv':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: mpeg4, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 59.94 tbc
    
    Stream #0.1: Audio: libvorbis, 48000 Hz, 5.1, s16
    
    Stream #0.2: Subtitle: ass, 200 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
    
  Stream #0:9 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:1 -> #0:2 (dvdsub -> ass)
    
Press ctrl-c to stop encoding
    
[ass @ 0x13d19c0] Only SUBTITLE_ASS type supported.
    
Subtitle encoding failed

    command

    avconv -i mylongmovie.VOB -c:s copy mylongmovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0xce1d40] max_analyze_duration reached
    
Input #0, mpeg, from 'mylongmovie.VOB':
    
  Duration: 00:00:30.24, start: 0.280633, bitrate: 2103365 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 8000 kb/s, 27.46 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
File 'mylongmovie.mkv' already exists. Overwrite ? [y/N] y
    
[buffer @ 0xce93c0] w:720 h:480 pixfmt:yuv420p
    
Output #0, matroska, to 'mylongmovie.mkv':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: mpeg4, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 59.94 tbc
    
    Stream #0.1: Audio: libvorbis, 48000 Hz, 5.1, s16
    
    Stream #0.2: Subtitle: dvdsub
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
    
  Stream #0:9 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:1 -> #0:2 (copy)
    
Press ctrl-c to stop encoding
    
[matroska @ 0xce4b40] Application provided invalid, non monotonically increasing dts to muxer in stream 2: 49 >= 49
    
av_interleaved_write_frame(): Invalid argument

  • convert avi to 3gp with ffmpeg

    2 octobre 2013, par jeet

    I'm trying to convert avi to 3gp, and reduce the size of frames from 800x600 to a smaller size, suitable for mobiles.
    What size should I use and where to set it in this command below ?
    Please give me the new command.

    ffmpeg -i input.avi -vcodec libx264 -s qvga -b 6438912 -r 16 -acodec libvo_aacenc -ab 393216 -ar 32000 -ac 1 -y output.3gp

    Thanks

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