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  1. I'm trying to concat m4s files into an mp4 file and this is the message ffmpeg gives:

    [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000012a1c0] Format mov,mp4,m4a,3gp,3g2,mj2 dete
    cted only with low score of 1, misdetection possible!
    [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000012a1c0] moov atom not found
    [concat @ 0000000000120500] Impossible to open 'segment-0.mp4'
    segments.txt: Invalid data found when processing input
    I'm using the following command:
    ffmpeg.exe -f concat -i segments.txt video.mp4
    The segments.txt file looks like this:
    file 'segment-0.mp4'
    file 'segment-1.m4s'
    file 'segment-2.m4s'
    file 'segment-3.m4s'
    file 'segment-4.m4s'
    file 'segment-5.m4s'
    All of the segments, txt file, and ffmpeg files are in the same directory. All of the information I found regarding that error message wasn't applicable to my situation. Any help would be appreciated.
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  2. Are you using an old version of ffmpeg? Are you sure "segment-0.mp4" is the correct file and not broken? Can you post the download link?

    P.S.: I think you are supposed to use ffmpeg's "concat protocol" and not the "concat demuxer" but it doesn't explain the error message.
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