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Other articles (104)

  • Websites made ​​with MediaSPIP

    2 May 2011, by

    This page lists some websites based on MediaSPIP.

  • Gestion de la ferme

    2 March 2010, by

    La ferme est gérée dans son ensemble par des "super admins".
    Certains réglages peuvent être fais afin de réguler les besoins des différents canaux.
    Dans un premier temps il utilise le plugin "Gestion de mutualisation"

  • Les autorisations surchargées par les plugins

    27 April 2010, by

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

On other websites (9413)

  • Python get list of streams from video (audio/video)

    2 August 2019, by user972014

    I have a video file and I want to get the list of streams from it. I can see the needed result by for example executing a simple `ffprobe video.mp4:

    ....
    
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661) ......
    
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), ......
    
....

    But I need to use python and code that will work both on Windows and Ubuntu, without executing an external process.

    My real goal is to check whether there is ANY audio stream within the video (a simple yes/no would suffice), but I think getting extra information can be helpful for my problem, so I’m asking about the entire streams

    EDIT: Clarifying that I need to avoid executing some external process, but looking for some python code/library to do it within the process.

  • Is there a way to concatenate mp4 video files in ffmpeg without video resolution switching? [closed]

    15 May 2024, by Micery999

    So i tried this command from windows

    


    (echo file 'first file.mp4' & echo file 'second file.mp4' )>list.txt
ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4


    


    while making a batch file

    


    Then i concatenate two video's and as soon as the one video ended. It changes resolution, then the video player started to glitch out pixel's like in vlc.

    


    Even if i typed

    


    ffmpeg -safe 0 -f concat -i list.txt -vf scale=640:360 -c copy output.mp4


    


    Nothing happened.

    


  • Extracting audio from video per video frame (C++) [on hold]

    5 September 2015, by PaulZyCZ

    Several days ago I had written an interface (in C) to simple DLL library which processes video in OpenCV using Qt5 framework. There is a function which takes frame ID and returns the raw picture data of the frame (so it can be played in Unity using C#). There is however no function to extract corresponding audio. So I am looking for a way to write such a function.

    I am thinking of a way to extract audio from video file (say MP4 with MPEG-4), with length of the corresponding video frame. But so far I have found only tutorials about extracting whole track (via FFMPEG) either to save or play the sound.

    Is there a way to extract only a "frame" (1/fps seconds of audio)? Or would it be better to create indexes and extract whole track?

    Thank you for answers.

    PS: Usual questions deal with whole track, not one frame-length sample specified by video frame ID. I have little knowledge of the FFMPEG and it has been several months since I used it last in uni project.

    I have frame, it’s ID, but no sound to it.

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