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Autres articles (42)

  • 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 (...)

  • 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 (...)

Sur d’autres sites (5316)

  • Unable to find a suitable output format for : Invalid argument

    17 février 2016, par Edgar Canul

    Grettings.
    I’ve read another questions for this problem, but they are instruction-specific issues. Here’s mine :

    ffmpeg -ss 118 -i E :\PF2015\VUELO_1\Video1hd.mp4 -t 6 -codec copy E :\H61005 Git\H61005\reportes\testSnaps\videos\hdVideo121_3.mp4

    The surprise is that I had used this instruction to extract a video fragment (from 118 to 124 secs) and it worked fine. Suddenly it stopped working.

  • Find and remove multiple audio tracks in video using ffmpeg

    14 février 2016, par Jaimin Patel

    I have 1 video which has multiple audios in it. There are some dialogues and few different soundtracks. But, when i use ffmpeg -i 1.mp4 it shows only 2 streams.

    Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2964 kb/s, 24 fps, 24 tbr, 90k tbn, 48 tbc (default)

    Stream #0:1(und) : Audio : aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)

    Its showing only 1 audio stream, If i remove that stream whole video will be mute. But, i only want to remove particular soundtrack from video, and its not showing separate audio stream for different soundtracks and dialogue used in video.

  • How to find the actual size occupied by an AVFrame ?

    23 septembre 2013, par jsp99

    The main task at hand is to find the actual size of a decoded AVFrame.

    Here is some background information about the problem -
    I wrote a program which takes as input a media file and displays all the video frames of the file, on the screen. My Code (written in C using SDL and ffmpeg) worked perfectly with .wmv files. When it came to .mkv files, it failed (SIGSEGV) due to the following reason :

    Example : Suppose I have a decoded frame from my video stream of file (filename.mkv) in AVFrame *pFrame. The frame has a pix_fmt (pFrame->pix_fmt) of yuv420p. It has dimensions 640 * 346. The Y-plane has it's linesize (pFrame->linesize[0]) as 672.

    I think you get the point here. When I use avpicture_get_size() to get the size of the frame, it calculates a wrong size. It takes pix_fmt, width and height as arguments. Nowhere does it consider 672 instead of 640.

    avpicture_get_size() : Calculates the size in bytes that a picture of the given width and height would occupy if stored in the given picture format.

    I got around this problem by adding some yuv420p frame specific code, which can find the size of the frame in situations like above.

    • Can someone explain why are most of the decoded frames (from video streams of most of the formats) this way ? And why is it not this way with the wmv format ?

    But if I have to find the actual size occupied by an AVFrame of another format (Eg: yuv410p), I have to write the format specific code again. Coming to the main problem,

    • How can I find the actual size occupied the decoded AVFrame (size in bytes occupied by the data of the AVFrame) ?

    • I tried using av_image_get_buffer_size(), but I couldn't understand how to use the align parameter. Can someone explain the usage of the parameter align ? Tried using many other functions in pixdesc.c, but I am missing something.

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