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Autres articles (57)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Librairies et logiciels spécifiques aux médias

    10 décembre 2010, par

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)

  • 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 (11951)

  • lavfi/fifo : fix flushing when using request_samples

    4 août 2013, par Anton Khirnov
    lavfi/fifo : fix flushing when using request_samples

    If any samples are still buffered when request_frame returns EOF, they
    
won’t be returned currently.
    • [DH] libavfilter/fifo.c

  • Audio clicks / cracklings with ffmpeg audio recording on mac os

    15 février 2023, par Specimen

    I'm having audio clicks on my ffmpeg audio recordings. If I record with OBS for example, the audio comes out just fine. This is what I put in the terminal :

    


    ffmpeg -f avfoundation -i ":0" test.mp3


    


    where 0 is my Soundflower audio device, which I found using ffmpeg -f avfoundation -list_devices true -i "", which returns :

    


    AVFoundation audio devices:
[0] Soundflower (2ch)


    


    Soundflower, my speakers, and the ffmpeg recording are all set at 48kHz.
There is another thread that states that this may be an issue with ffmpeg version 4.3, and to try to downgrade to 4.2 ; I tried to google how to downgrade on brew, but didn't find anything.

    


  • FFmpeg - Fragmented MP4 with non-fixed frame rate

    8 octobre 2015, par galbarm

    I’m creating a fragmented MP4 for the use of playing in Media Source Extensions.
    The command line is : ffmpeg.exe -probesize 10000000 -r 10 -i - -vcodec copy -an -f mp4 -reset_timestamps 0 -blocksize 30000 -movflags empty_moov+default_base_moof+frag_keyframe -loglevel debug -

    The source of the video is an IP camera streaming H.264.
    The configured and expected frame rate is 10FPS but there is no guarantee for 10FPS, for example a frame may get dropped occasionally, or the camera may just not play nice with what it declares.
    I have simulate a 10% p-frames drops to emphasize the following issue :

    With the above command, the output video plays faster than real-time and this is a problem because the whole pipe is a live stream.
    With the 10% frame drop simulation, the effective playback rate it 1.1x.
    I don’t want to obligate to a fixed frame rate because there is no guarantee for a fixed-rate.
    If I remove the -r 10 flag entirely, the MP4 seems to the playing at 2x-3x speed.

    Is there a way building the MP4 timestamps in a more dynamic way ? for example, giving it the RTP timestamp or somehow telling ffmpeg to build the MP4 with the timestamp of the "feed" time ?

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