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I have 2 mp4 videos that fail to concatenate when using:

MP4Box -add 1.mp4 -cat 2.mp4 out.mp4

Is there a way to re-encode 2.mp4 so that the concat call will create a valid output? Possibly with ffmpeg? I can only re-encode one file and I want the concatenation to not do any encoding.

The error I currently get with these 2 files is:

[iso file] Box "minf" has 56 extra bytes Error appending 2.mp4: IsoMedia File is truncated

Scrooch
  • 111

1 Answers1

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You can try doing this with ffmpeg:

mkfifo temp0 temp1
ffmpeg -i input0.mp4 -c copy -bsf h264_mp4toannexb -f mpegts -y temp0 2> /dev/null & \
ffmpeg -i input1.mp4 -c copy -bsf h264_mp4toannexb -f mpegts -y temp1 2> /dev/null & \
ffmpeg -f mpegts -i "concat:temp0|temp1" -c copy -absf aac_adtstoasc output.mp4

This doesn't re-encode anything, it places them in a new transport stream container, which makes them more easy to concatenate, and then concatenates them back into an MP4. If output.mp4 already exists, the command will fail. The version above uses named pipes, it you're on a system that doesn't support those you'd have to use intermediate files:

ffmpeg -i input0.mp4 -c copy -bsf h264_mp4toannexb temp0.ts
ffmpeg -i input1.mp4 -c copy -bsf h264_mp4toannexb temp1.ts
ffmpeg -i "concat:temp0.ts|temp1.ts" -c copy -absf aac_adtstoasc output.mp4
evilsoup
  • 14,056