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  • Create muted video and black screen video with FFmpeg on OS X

    22 septembre 2017, par user2685832

    I’m trying to use FFmpeg on OS X to generate the following from a local mp4-file :

    • A copy of the original video with no audio
    • A copy of the original video with audio but without visuals (a black screen instead). This file also needs to be in mp4 format.

    After reading through the documentation I am struggling to get the terminal commands right. To remove the audio I have tried this command without any success :

        ffmpeg -i file.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy

    Could anyone guide me towards how to accomplish this ?

    Thanks !

  • ffmpeg : given a video of any length, create timelapse video of 6-8 seconds long

    14 mai 2018, par CDub

    I have an application which consumes video of any length (could be a few seconds, could be several minutes) and I want to use ffmpeg to return a "timelapse" version of the input video which will always be between 6 and 8 seconds long.

    I’ve been fiddling with the following :

    ffmpeg -y -i in.mp4 -r 10 -vf setpts='0.01*PTS' -an out.mp4

    Which seems to be a good start, but still generates very dynamic results given what in.mp4 is.

    I also don’t fully understand the verbiage in the ffmpeg documentation, so I’m not even sure what arguments to use for setpts, or if setpts is the correct filter I want to use.

  • Is there a way to display video, then an image, then more video using OpenCV ?

    24 septembre 2015, par kdibene1

    I have a bunch of frames (jpg images) and want to stitch some of them together and make a video, then display one image (essentially repeating the same frame for a number of seconds) and then stitch more frames together and continue playing the video. I want it to be continuous with no interruptions, is this possible ? I know about avconv and ffmpeg, but they only stitch together frames and make a video, they do not simply display a frame over and over again like with ImageMagick. Essentially what I want to do is take a bunch of image frames, stitch them together to an arbitrary point, then display an image, then stitch together the remaining frames to a video.

    Can anyone help ?

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