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Autres articles (31)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • 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 (...)

  • De l’upload à la vidéo finale [version standalone]

    31 janvier 2010, par

    Le chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
    Upload et récupération d’informations de la vidéo source
    Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
    Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)

Sur d’autres sites (5567)

  • movenc : Allow interleaving samples when writing fragmented files

    10 septembre 2013, par Martin Storsjö
    movenc : Allow interleaving samples when writing fragmented files

    This is incompatible with the omit_tfhd_offset flag (writing
    
position independent fragments with interleaving requires the
    
default_base_moof flag).
    

    This makes the moof atoms slightly bigger, but can be better for
    
playback (improving locality of sample data in the mdat).
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DBH] libavformat/movenc.c
    • [DBH] libavformat/movenc.h

  • ffmpeg video streaming deep understanding

    14 novembre 2012, par Stefan Alexandru

    The main question is if it is possible to somehow go around the frame index checking that ffmpeg does when writing the frame to a file.

    Now I will explain my exact problem so you can understand better what I need or maybe think of an alternative solution.

    Problem n0.1 : I am getting video stream from two independent cameras and for some reason I want to save it in the same video file. First the frames from the first camera and then the frames from the second. When writing the frames from the second camera av_write_frame would return the error code -22 and will fail to add the frame. That's because the writing context is expecting a frame index following the index of the previously written frame (the last frame from camera 1) but he receives a frame with the index 0, the first frame from the second camera.

    Problem no.2 : Consider the following problem independently to the first one.
    I am trying to save a video stream to a file but the frame rate is double the real speed. So because I couldn't find any working solution to speed down the frame rate i thought to write every frame twice in the video file. But it won't make any difference to the frame rate.
    I also tried a different approach on the frame rate problem but it also failed(question here).

    Any kind of working solution would be highly appreciated.

    Also it's important that I can't use console commands, I need C code, as I need to integrate those functionalities in an Android application that is automated.

  • Discard channels when recording from audio interface with FFmpeg

    23 novembre 2017, par filib

    I’m calling ffmpeg from a program I’m writing in order to record audio from an audio interface. The audio interface has six channels and what I’d like to do is only record from the first two audio channels, discarding the rest. I can’t work out how to do this or if it is even possible from the documentation.

    The command I’m using is as follows :

    ffmpeg -f alsa -acodec pcm_s32le -ac 6 -ar 44100 -i hw:CARD=K6,DEV=0 output.wav

    Is this something that is possible ? If so, how ?

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