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Autres articles (94)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • Le profil des utilisateurs

    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
    L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)

  • Configurer la prise en compte des langues

    15 novembre 2010, par

    Accéder à la configuration et ajouter des langues prises en compte
    Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
    De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
    Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...)

Sur d’autres sites (11026)

  • FFmpeg : Read profile level information from mp4

    31 mars 2016, par Martin

    I have a mp4 file and need the profile level of it. FFmpeg says, it has baseline profile, which is what I need, but I need also the level.

    Here is what I get from FFmpeg :

    ffmpeg version 0.8, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Jul 20 2011 13:32:19 with gcc 4.4.3
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264
    
  libavutil    51.  9. 1 / 51.  9. 1
    
  libavcodec   53.  7. 0 / 53.  7. 0
    
  libavformat  53.  4. 0 / 53.  4. 0
    
  libavdevice  53.  1. 1 / 53.  1. 1
    
  libavfilter   2. 23. 0 /  2. 23. 0
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test-show.mp4':
    
  Metadata:
    
    major_brand     : f4v 
    
    minor_version   : 0
    
    compatible_brands: isommp42m4v 
    
    creation_time   : 2012-03-21 16:00:00
    
  Duration: 00:56:07.40, start: 0.000000, bitrate: 2004 kb/s
    
    Stream #0.0(eng): Video: h264 (Baseline), yuv420p, 854x480 [PAR 1:1 DAR 427:240], 1904 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 2012-03-21 16:00:00
    
    Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 96 kb/s
    
    Metadata:
    
      creation_time   : 2012-03-21 16:00:00
    
At least one output file must be specified

    Is there any option other than -i I can use to get the level information ?

  • command for ffmpeg encode h264 baseline profile level 1

    25 décembre 2011, par Morteza M.

    Can anyone suggest a command to encode video to h264 baseline profile ( level 1) ?

    Here is a link for reference : http://blog.mediacoderhq.com/h264-profiles-and-levels/

    I used this command but ffmpeg says it is Main profile not baseline.

    ffmpeg -i <source> -vcodec libx264 -coder 0 -flags +loop+mv4 \
    
-partitions +parti4x4+parti8x8+parti4x4+partp8x8+partb8x8 -me_method hex -subq 7 \
    
-trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -threads 2 \
    
-s 240x160 -b:v 64k -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 \
    
-qmin 10 -qmax 51 -qdiff 4 -strict experimental -acodec aac -ac 1 -ab 48000 \
    
-f mpegts udp://127.0.0.1:10006?pkt_size=1316
    
</source>

  • Recommendations for real-time pixel-level analysis of television (TV) video

    6 décembre 2011, par Randall Cook

    [Note : This is a rewrite of an earlier question that was considered inappropriate and closed.]

    I need to do some pixel-level analysis of television (TV) video. The exact nature of this analysis is not pertinent, but it basically involves looking at every pixel of every frame of TV video, starting from an MPEG-2 transport stream. The host platform will be server-class, multiprocessor 64-bit Linux machines.

    I need a library that can handle the decoding of the transport stream and present me with the image data in real-time. OpenCV and ffmpeg are two libraries that I am considering for this work. OpenCV is appealing because I have heard it has easy to use APIs and rich image analysis support, but I have no experience using it. I have used ffmpeg in the past for extracting video frame data from files for analysis, but it lacks image analysis support (though Intel's IPP can supplement).

    In addition to general recommendations for approaches to this problem (excluding the actual image analysis), I have some more specific questions that would help me get started :

    1. Are ffmpeg or OpenCV commonly used in industry as a foundation for real-time
      video analysis, or is there something else I should be looking at ?
    2. Can OpenCV decode video frames in real time, and still leave enough
      CPU left over to do nontrivial image analysis, also in real-time ?
    3. Is sufficient to use ffpmeg for MPEG-2 transport stream decoding, or
      is it preferable to just use an MPEG-2 decoding library directly (and if so, which one) ?
    4. Are there particular pixel formats for the output frames that ffmpeg
      or OpenCV is particularly efficient at producing (like RGB, YUV, or YUV422, etc) ?

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