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Médias (1)

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  • 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 (...)

  • MediaSPIP 0.1 Beta version

    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

  • Taille des images et des logos définissables

    9 février 2011, par

    Dans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
    Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...)

Sur d’autres sites (9894)

  • decode video frames into OpenGL textures with FFmpeg -> QSV -> glTexImage2D

    21 novembre 2019, par gameOverMan

    Is anyone aware of the most accelerated route of binding an AVFrame returned from ffmpeg avcodec_receive_frame when using Intel Quick Sync Video (QSV) to an OpenGL texture ?

    I’m using ffmpeg’s QSV decode and mapping a NV12 returned frame to a software buffer via av_hwframe_map to allow the OpenGL creation of two planes (NV12) as two textures for GLSL pixel shader colour conversion and more on route to display.

    Is this the fastest route using the two frameworks ?

    Native QSV via dx9 + HLSL is much faster.

    I’ve seen some OpenCL extensions for surface mapping. Any pointers are interesting to know. Note, QSV decoded frames have advantages as they may not reside in dedicated gc video memory as a thought.

  • How to use ffmpeg to record audio from a video for first 10 seconds in Python

    13 novembre 2022, par S Andrew

    I have RTSP stream coming from a camera which also has audio. My goal is to save the audio. To do this, I have below code :

    


    import ffmpeg&#xA;ffmpeg.input("rtsp://john:<pwd>@192.168.10.111:5545/Streaming/Channels/291/").output("test.wav", map="0:a:0").run&#xA;</pwd>

    &#xA;

    When I terminate the Python script, it saves the test.wav file which has just the audio from the rtsp stream. Now I am trying to save the first 10 sec from the stream into 1 file and then the next 10sec in another file and then it keeps on going until terminated.

    &#xA;

    To do this, I have thought of putting the ffmpeg stream in a separate thread and to schedule that thread to run every 10 sec. This way a new stream will create which will save the audio for 10sec and will exit, and then this keeps on going. But to achieve this, I need to know how can we just save the initial 10 sec from the stream.

    &#xA;

  • Best way to develop a multimedia player [on hold]

    30 décembre 2016, par Martin

    I would like to develop a multimedia player. I should design a structure which describes a collection of video and audio files. It can specify each video stream start and end time (such as different audio streams) and the player should play the collection as it was one stream.

    An example : I want to play 2 minutes from the first video file’s video stream from minute 3, and 3 minutes from the second video file from minute 1, during the 5 minute specified above I want to play a third file’s audio stream.

    I thought about developing it in C (which has the proper memory manipulation possibilities) with the help of ffmpeg library (to be able to support a wide range of media formats) and the SDL library to show the output.
    Have you any thoughts on this which could help me ? (eg. : any pitfalls, other/better ways to solve this problem)

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