[FFmpeg-user] ffmpeg concat copy changes xvid to mpg4a that stutters

[f1cg2x+7377ko01vyox4 at guerrillamail.com]

In put files have xvid mpeg-4, mpg3

ffmpeg -f concat -safe 0 -fflags +genpts -i files.txt -c copy -bsf:v mpeg4_unpack_bframes test.mkv

has mp4v, mpga

The concatenated video stutters, audio is fine. Why is this happening when I just copy? And why does the output file not have xvid?





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