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Autres articles (43)

  • 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 (...)

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (8853)

  • HLS Streaming on IPad with IOS 7 / 8 causes 10 seconds freezed frame - no clue why

    25 juin 2014, par user3747636

    We have a problem with HLS h.264 mp4 on IPad devices using HLS streaming on IOS 7 and 8 :

    The first 9-15 seconds (the length of the first TS segment) only shows the first key frame (IDR) of the second TS segment, while the sound plays normally. When the second segment begins to play, the video continues as it should.

    HLS segmenter is a wowza with 10 seconds segment length. The encoding software we use is TMPG, latest version (uses x264). The funny thing is, that handbrake, xmedia recode, adobe me deliver videos which work. I am aware of the fact, that this hints to a bug within our encoding software, but if someone already had that problem with another software / segmenter combination and fixed it, I would like to know what the source of the problem was.

    What we already tried :

    • changing almost every setting so that it sticks as close as possible to apple’s recommendations
    • changing GOP structure, GOP length, encoding parameters which influence efficiency of encoding
    • analysis of the TS segments created by wowza, they are fine and begin all with keyframes
    • contact TMPG/Apple/Wowza support

    So, did anyone stumble upon this problem before ? Has anyone solved it ?

    EDIT :

    It seems that TMPGEnc uses a defective x264 implementation. The mediastreamvalidator tool from Apple returned an error stating that our TS segment "does not contain any IDR access unit with a SPS and a PPS" - which it does actually, but obviously in the wrong places if that somehow matters.

  • FFmpeg, overlay, black detect, intermission — too much to ask ?

    11 avril 2016, par Timo Mika Gläßer

    I have two streams (see the schematic in the picture below). One is the main video-stream which is constantly on and one is a picture-in-picture stream which have intermissions. Both are fed to ffmpeg as live streams and I want to redistribute them as a merged live stream again.

    Is there a way to either have a static image for the picture-in-picture stream when it has no data (i.e. using blackdetect) or completely hiding it temporarily ?

    Screenlayout

  • ffmpeg adding 6 secs of black frames in the beginning of a file

    7 août 2014, par user3842039

    Trying to convert a .mov file (h264 and pcm) generated in Mpegstreamclip (MacOS) and the result is strangely out of sync with around 6 seconds of black frames at the beginning. I have tried many differente audio and video codec and the result is the same even with a -vcodec copy and -acodec copy. Below the return of ffmpeg (git version compiled today - 06/08/2014) :

            ffmpeg -i /media/dados/x/PGM-970.mov -vcodec copy -acodec copy  /media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov 
    
    ffmpeg version 2.3.git-1ace957 Copyright (c) 2000-2014 the FFmpeg developers
    
      built on Jul 26 2014 20:25:06 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
    
      configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
    
      libavutil      52. 92.101 / 52. 92.101
    
      libavcodec     55. 69.100 / 55. 69.100
    
      libavformat    55. 49.100 / 55. 49.100
    
      libavdevice    55. 13.102 / 55. 13.102
    
      libavfilter     4. 11.102 /  4. 11.102
    
      libavresample   1.  3.  0 /  1.  3.  0
    
      libswscale      2.  6.100 /  2.  6.100
    
      libswresample   0. 19.100 /  0. 19.100
    
      libpostproc    52.  3.100 / 52.  3.100
    
    [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ddac20] multiple edit list entries, a/v desync might occur, patch welcome
    
    [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ddac20] Concatenated H.264 or H.265 might not play correctly.
    
    Guessed Channel Layout for  Input Stream #0.1 : mono
    
    Guessed Channel Layout for  Input Stream #0.2 : mono
    
    Guessed Channel Layout for  Input Stream #0.3 : mono
    
    Guessed Channel Layout for  Input Stream #0.4 : mono
    
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/dados/x/PGM-970.mov':
    
      Metadata:
    
        major_brand     : qt  
    
        minor_version   : 537199360
    
        compatible_brands: qt  
    
        creation_time   : 2014-08-01 16:50:24
    
      Duration: 00:24:56.30, start: 0.000000, bitrate: 8350 kb/s
    
        Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte1File '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov' already exists. Overwrite ? [y/N] y
    

    
70m), 720x480, 5258 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      handler_name    : Apple Alias Data Handler
    
      encoder         : H.264
    
      timecode        : 01:00:00;00
    
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      File '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov' already exists. Overwrite ? [y/N] yhandler_name    : Apple Alias Data Handler
    
    Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:3(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:4(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:5(eng): Data: none (tmcd / 0x64636D74) (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:51:16
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 01:00:00;00
    

    
Output #0, mov, to '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    encoder         : Lavf55.49.100
    
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, q=2-31, 5258 kb/s, 29.97 fps, 11988 tbn, 2997 tbc (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      handler_name    : Apple Alias Data Handler
    
      encoder         : H.264
    
      timecode        : 01:00:00;00
    
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-08-01 16:50:24
    
      handler_name    : Apple Alias Data Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help

    Even ignoring the audio stream with "-an" ffmpeg persists to add the frames and alter the output duration.

    Any help is very much appreciated ! thanks in advance

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