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Médias (17)

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Autres articles (50)

  • MediaSPIP : Modification des droits de création d’objets et de publication définitive

    11 novembre 2010, par

    Par défaut, MediaSPIP permet de créer 5 types d’objets.
    Toujours par défaut les droits de création et de publication définitive de ces objets sont réservés aux administrateurs, mais ils sont bien entendu configurables par les webmestres.
    Ces droits sont ainsi bloqués pour plusieurs raisons : parce que le fait d’autoriser à publier doit être la volonté du webmestre pas de l’ensemble de la plateforme et donc ne pas être un choix par défaut ; parce qu’avoir un compte peut servir à autre choses également, (...)

  • 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" ;

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

Sur d’autres sites (4007)

  • Revision 3606b78108 : Modified test for auto key frame detection. The existing test was triggering a

    16 avril 2015, par paulwilkins

    Changed Paths :
     Modify /vp9/encoder/vp9_firstpass.c



    Modified test for auto key frame detection.

    The existing test was triggering a lot of false positives on some types
    of animated material with very plain backgrounds. These were triggering
    code designed to catch key frames in letter box format clips.

    This patch tightens up the criteria and imposes a minimum requirement
    on the % blocks coded intra in the first pass and the ratio between the
    % coded intra and the modified inter % after discounting neutral (flat)
    blocks that are coded equally well either way.

    On a particular problem animation clip this change eliminated a large
    number of false positives including some cases where the old code
    selected kf several times in a row. Marginal false negatives are less
    damaging typically to compression and in the problem clip there are now
    a couple of cases where "visual" scene cuts are ignored because of well
    correlated content across the scene cut.

    Replaced some magic numbers related to this with #defines and added
    explanatory comments.

    Change-Id : Ia3d304ac60eb7e4323e3817eaf83b4752cd63ecf

  • avcodec/ffv1dec_template : Optimize common case in run mode

    23 mai 2019, par Michael Niedermayer
    avcodec/ffv1dec_template : Optimize common case in run mode

    Fixes : Timeout (14sec -> 9sec)
    
Fixes : 13398/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5664106709778432
    

    decode_line() becomes 1% faster for fate/vsynth2-ffv1.avi
    
for another fate sample there is a 0.5% speedup
    
the effect should be bigger for files with "flat" colored areas
    
the new faster branch is used in 97-100% of the cases in fate samples
    
compared to the older more complex (which i tested)
    

    vsynth3-ffv1-v3-bgr0.avi had the lowest percentual useage of about 97%
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/ffv1dec_template.c

  • Graph-based video processing for .NET

    23 octobre 2016, par Borv

    Does anyone know a good object-oriented library (preferably high-level, like C# or Java) for working with video and audio streams ?

    I wrote an app which fiddles with video and audio streams, feeds and such. The original task was simple :

    • grab an RTSP feed
    • display original feed(s) on the display
    • convert it to a series of h264 ts files
    • extract audio into separate MP3 files
    • upload videos and audio to the web site (preferably in real time, few minute delay is acceptable)

    As you may have already guessed it is about recording events (e.g. lectures) and publishing them on the web.

    To pull this out I needed some graph-based non-linear editing for media. Two weeks in, I tried ffmpeg, vlc and WMF. The only library I got to work is ffmpeg, and that comes with lots of "however". WMF required a lot of coding (and I abandoned this path), vlc looked great on paper, but I stumbled across some bugs with input splitting I could not get around (e.g. transcode:es combination flat out refused to work).

    So, the question. What are good non-linear editing libraries besides ffmpeg, vlc and wmf/directshow that allow for building video processing graphs with sources, sinks and filters ? Or perhaps good bindings over ffmpeg and vlc allowing to build such graphs ?

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