I have a file 1.mp4 (Video: h264, Audio: mp3) that has a duration of 90 mins
and a file second.mp4 (same Video/Audio). Both files play fine.
I'm trying to cut a piece from second.mp4 by
ffmpeg -ss 0:12:09 -i second.mp4 -codec copy -t 0:01:19 2.mp4
and then to concatenate both with
ffmpeg -f concat -i <(printf "file '$PWD/%s'\n" ./{1,2}.mp4) -c copy new.mp4
The problem is that new.mp4 only plays until the end of former 1.mp4. The
following 2.mp4-part is either still picture or kinda slow motion. I think
it's because of wrong timestamps because ffmpeg tells about DTS being
non-monotonous or out of order.
So how can I concatenate both files? ffmpeg is v2.8.6.
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