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I have the following files (all .mp4). Whenever I want to concatenate them, the timestamps apparently get broken. Is there a way to correct those files with transcoding? enter image description here

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No need to transcode, it can be done via remuxing.

ffmpeg -i in.mp4 -map 0 -c copy -video_track_timescale 30 out.mp4

where 30 is the new tbn value.

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