I found the problem. FFmpeg is corrupting the last B-frame at the end of cuts. It shows up during
subsequent concatenation. Why it's happening is unknown of course.
There is no workaround that I can conceive of.
--Mark.
000 PTS video 1 video 2
< 504197456 504204963 N=133560 _B[P]B_B_P_B_I_ _I_B_P_ <== 3
< 504201210 504201210 N=133559 [B]P_B_B_P_B_I_ _I_B_P_
< 504204963 504216225 N=133563 _B_P_B_B[P]B_I_ _I_B_P_ <== 2
< 504208717 504208717 N=133561 _B_P[B]B_P_B_I_ _I_B_P_
< 504212471 504212471 N=133562 _B_P_B[B]P_B_I_ _I_B_P_
< 504216225 504223732 N=133565 _B_P_B_B_P_B[I] _I_B_P_ <== 1
< 504219978 504219978 N=133564 _B_P_B_B_P[B]I_ _I_B_P_
join here
> 504219979 504227486 N=133566 _B_P_B_B_P_B_I_ [I]B_P_
> 504227486 504234994 N=133568 _B_P_B_B_P_B_I_ _I_B[P]
> 504231240 504231240 N=133567 _B_P_B_B_P_B_I_ _I[B]P_
1 - If I trim the end of video 1 at the I-frame at N=133565
ffmpeg -copyts -i this.m2ts -map 0 -bsf:v noise=drop='lt(pts\,2854113)+gt(pts\,504223732)' -bsf:a
noise=drop='lt(pts\,2854113)+gt(pts\,504223732)' -bsf:s
noise=drop='lt(pts\,2854113)+gt(pts\,504223732)' %CODE% -muxdelay 0 "%TARGET%"
I get "Packet corrupt (stream = 0, dts = 504219978)" and there's a glitch
during play.
2 - If I back up and trim the end of video 1 at the P-frame at N=133563
ffmpeg -copyts -i this.m2ts -map 0 -bsf:v noise=drop='lt(pts\,2854113)+gt(pts\,504216225)' -bsf:a
noise=drop='lt(pts\,2854113)+gt(pts\,504216225)' -bsf:s
noise=drop='lt(pts\,2854113)+gt(pts\,504216225)' %CODE% -muxdelay 0 "%TARGET%"
I get "Packet corrupt (stream = 0, dts = 504208717)" and there's a glitch
during play.
3 - If I back up again and trim the end of video 1 at the P-frame at N=133560
ffmpeg -copyts -i this.m2ts -map 0 -bsf:v noise=drop='lt(pts\,2854113)+gt(pts\,504204963)' -bsf:a
noise=drop='lt(pts\,2854113)+gt(pts\,504204963)' -bsf:s
noise=drop='lt(pts\,2854113)+gt(pts\,504204963)' %CODE% -muxdelay 0 "%TARGET%"
I get "Packet corrupt (stream = 0, dts = 504201210)" and there's a glitch
during play.
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