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  • 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 (...)

  • MediaSPIP version 0.1 Beta

    16 avril 2011, par

    MediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
    Pour avoir une installation fonctionnelle, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
    Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

  • Amélioration de la version de base

    13 septembre 2013

    Jolie sélection multiple
    Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
    Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...)

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  • 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.

  • 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.

  • 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.

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