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Autres articles (66)

  • 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.

  • 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 (...)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

Sur d’autres sites (10866)

  • FFMPEG multiple crop on same video

    18 juin 2017, par djdan_23

    I have one .mkv that have 4 sections in time that need to be cropped.
    (Meaning that the top-bot blacks bars appears sometimes during the viewing).
    How can I do that using FFMPEG.
    I know about crop for an entire film, but using it at 4 different places on the same video, that I don’t.
    Thanks at advance.

  • Merge MP4 files with ffmpeg

    10 mars 2014, par user3156324

    I have two MP4 files that one contain video and audio, and one contains only video,

    I have to combine both files – meaning, play both files at the same time. I do not want to concatenate them (add one after another).

    So how can I do this ?

  • avcodec/hevcdec : Add stat_coeffs to HEVCABACState

    30 juin 2022, par Andreas Rheinhardt
    avcodec/hevcdec : Add stat_coeffs to HEVCABACState

    The HEVC decoder has both HEVCContext and HEVCLocalContext
    
structures. The latter is supposed to be the structure
    
containing the per-slicethread state.
    

    Yet that is not how it is handled in practice : Each HEVCLocalContext
    
has a unique HEVCContext allocated for it and each of these
    
coincides with the main HEVCContext except in exactly one field :
    
The corresponding HEVCLocalContext.
    
This makes it possible to pass the HEVCContext everywhere where
    
logically a HEVCLocalContext should be used.
    

    This led to confusion in the first version of what eventually became
    
commit c8bc0f66a875bc3708d8dc11b757f2198606ffd7 :
    
Before said commit, the initialization of the Rice parameter derivation
    
state was incorrect ; the fix for single-threaded as well as
    
frame-threaded decoding was to add backup stats to HEVCContext
    
that are used when the cabac state is updated*, see
    
https://ffmpeg.org/pipermail/ffmpeg-devel/2020-August/268861.html
    
Yet due to what has been said above, this does not work for
    
slice-threading, because the each HEVCLocalContext has its own
    
HEVCContext, so the Rice parameter state would not be transferred
    
between threads.
    

    This is fixed in c8bc0f66a875bc3708d8dc11b757f2198606ffd7
    
by a hack : It rederives what the previous thread was and accesses
    
the corresponding HEVCContext.
    

    Fix this by treating the Rice parameter state the same way
    
the ordinary CABAC parameters are shared between threads :
    
Make them part of the same struct that is shared between
    
slice threads. This does not cause races, because
    
the parts of the code that access these Rice parameters
    
are a subset of the parts of code that access the CABAC parameters.
    

    * : And if the persistent_rice_adaptation_enabled_flag is set.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] libavcodec/hevc_cabac.c
    • [DH] libavcodec/hevcdec.c
    • [DH] libavcodec/hevcdec.h

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