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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 (2580)

  • avcodec/vdpau : Support for VDPAU accelerated HEVC decoding

    13 juin 2015, par Philip Langdale
    avcodec/vdpau : Support for VDPAU accelerated HEVC decoding

    This change introduces basic support for HEVC decoding through vdpau.
    
Right now, there are problems with the nvidia driver/library implementation
    
that mean that frames are incorrectly laid out in memory when they are
    
returned from the decoder, and it is normally impossible to recover the
    
complete decoded frame due to loss of data from alignment inconsistencies.
    

    I obviously hope that nvidia will be fixing it in due course - I’ve verified
    
the problems exist with their example application.
    

    As such, this support is not useful for any real world application, but I
    
believe that it is correct (with the caveat that the mangled frames may hide
    
problems) and will work properly once the nvidia problem is fixed.
    

    Right now it appears that any file encoded by x265 or nvenc is decoded
    
correctly, but that’s because these files don’t use a bunch of HEVC
    
features.
    

    Quick summary :
    

    Features that seem to work :
    

    1) Short Term References
    
2) Scaling Lists
    
3) Tiling
    

    Features with known problems :
    

    1) Long Term References
    

    It’s hard to tell what’s going on here. After I read the nvidia example
    
app that does not set the IsLongTerm flag on LTRs, and changed my code,
    
a bunch of frames using LTR started to display correctly, but there
    
are still samples with glitches that are related to LTRs.
    

    In terms of real world files, both x265 and nvenc only use short term
    
refs from this list. The divx encoder seems similar.
    

    Signed-off-by : Philip Langdale <philipl@overt.org>
    • [DH] configure
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/allcodecs.c
    • [DH] libavcodec/hevc.c
    • [DH] libavcodec/vdpau_hevc.c
    • [DH] libavcodec/vdpau_internal.h

  • codec_desc : mark some lossless audio codecs as intraonly.

    3 avril 2017, par Ronald S. Bultje
    codec_desc : mark some lossless audio codecs as intraonly.

    Fixes tsan warnings in several audio codecs (flac, alac, wavpack, tta
    
and tak) that look like this :
    

    WARNING : ThreadSanitizer : data race (pid=14340)
    
  Read of size 4 at 0x7d64000169d8 by main thread (mutexes : write M1335) :
    
    #0 update_context_from_thread src/libavcodec/pthread_frame.c:284 (ffmpeg+0x000000dc795f)
    
[..]
    
  Previous write of size 4 at 0x7d64000169d8 by thread T1 (mutexes : write M1333) :
    
    #0 wavpack_decode_block src/libavcodec/wavpack.c:1012 (ffmpeg+0x00000112b175)
    • [DH] libavcodec/avcodec.h
    • [DH] libavcodec/codec_desc.c

  • Fade out in ffmpeg when creating a video from a still image is wonky ?

    13 juin 2017, par Matt W

    I’m creating a video that :

    • uses a still image as a source
    • has a text overlay
    • fades in and out
    • has a silent stereo audio track.

    So far, I have this, and it (almost) works correctly :

    ffmpeg -f lavfi -i "aevalsrc=0|0" -loop 1 -i turtle-2.jpg  -c:v libx264 -t 5 -r 30 -s 1920x1080 -aspect 16:9 -pix_fmt yuv420p -filter:v drawtext="fontsize=130:fontfile=comic.ttf:text='hello world':x=(w-text_w)*.25:y=(h-text_h)*.75",fade=in:0:60,fade=out:90:60 -acodec aac turtle11.mp4

    The only problem is that the fade out doesn’t seem to be going to black, even tho this is a 150 frame video and I believe I am following the ffmpeg documentation correctly.

    The resulting video is here :

    http://video.blivenyc.com/vid-from-image/turtle11.mp4

    Any thoughts ?

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