When you’re run ffmpeg command and receive an error message similar to the following: Unsafe file name '00 M00S.mp4' mylist.txt: Operation not permitted This is because there is space in target filename in the text file. To fix this issue, add -safe 0 before -i If you have this issue from Combine MP4 files using FFMPEG on Windows (without re-encoding), simply replace command in step 7 to the following: ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4
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