GoPro cameras cut up video in 4GB MP4 files.

Attempting to merge them with ffmpeg 4.4.1 like so:

ls GH017642.MP4 GH027642.MP4 | while read line; do echo "file '$line'"; done | ffmpeg -protocol_whitelist file,pipe -f concat -i - -c copy out.mp4

fails with:

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x5573df8c9ec0] moov atom not found
[concat @ 0x5573df8b7ec0] Impossible to open 'pipe:GH017642.MP4'
pipe:: Invalid data found when processing input

"moov" does seem to be present in that file, though:

> ffmpeg -v trace -i GH017642.MP4 2>&1 | grep -e type:\'mdat\' -e type:\'moov\'
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55a71e111dc0] type:'mdat' parent:'root' sz: 3999992669 28 4001343671
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55a71e111dc0] type:'moov' parent:'root' sz: 1350982 3999992697 4001343671

Additionally, both Quicktime and VLC play that file just fine.

What could cause the ffmpeg error, how to fix it?

6 Sorted by: Reset to default

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