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Sur d’autres sites (7666)

  • How to combine a video with audio from another video using FFMPEG ?

    21 août 2023, par Sigmond Kukla

    I have two videos of the same length that I'd like to combine. Video A has audio, video B does not. I'd like to take the audio from video A and put it onto Video B. I'd like to do this with FFMPEG, but I can't figure out the arguments I need ? Should I use map ?

    


    There's a lot of questions about combining a video with audio, but not two videos.

    


    Do I maybe need an intermediate step of converting my original video to audio ?

    


    I have tried using this FFMPEG command, and a couple of variations. All of the resulted in just Video A (the one with audio) being the output.

    


    ffmpeg -i videoB.mp4 -i video A.mp4 -c:v copy -c:a aac output.mp4


    


  • How to merge two videos, so that the scale of the video takes up 50% of the size of the output video

    3 avril 2023, par Gadzhimurad Radzhabov

    How to merge two videos, so that the scale of the video takes up 50% of the size of the output video.

    


    For example I need to merge two videos so that one half of the video takes up 50% of the output video size from the top and the other half takes up 50% of the output video size from the bottom.

    


    i.e. to divide both video halves in the output video !

    


    Example of such video youtube.com/shorts/InBFBwkUsgI

    


    I tried to ask questions GPT but did not get a normal answer, that is, I do not know how to implement it in general heard that you can implement through vstack

    


  • ffmpeg / video processing : make video repeat itself without duplicating content ?

    31 mars 2022, par RocketNuts

    Suppose I have a video file that is 20 MB in size and lasts 30 seconds.

    


    I want to create a new video file that basically consists of the existing video, repeated 10 times. So the new video should last 300 seconds (5 minutes) and contain the same content every 30 seconds.

    


    I could of course append this video to itself 10 times, resulting in a file of approximately 200 MB. But this seems very redundant, since obviously the same content is in there tenfold. I was hoping for a somewhat more intelligent approach, where the same 30 seconds of video is somehow 'referenced' 10 times over.

    


    Do common encoders or container formats (say h.264 in a .mp4 or .mkv container) support this ? And by any chance is there a way to pull this off with ffmpeg ?

    


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