On 1/8/24 00:34, Andrew Randrianasulu wrote:
пн, 8 янв. 2024 г., 07:02 Mark Filipak <markfilipak.i...@gmail.com>:
I think some of Mark's problems might steam from fact he apparently cuts
blu-ray transport stream, not something commonly cut with ffmpeg.
Yes, but not quite true. I'm cutting, '-ss 20.062', but remuxing to mp4, not m2ts. So I'm not really
cutting the MPEG-TS stream.
Unfortunately, the mp4s that ffmpeg makes are too different from the m2ts. They have new DTSs &
PTSs, and whatever the problem is that ignores '-bsf:a setts=time_base=1/90000' is not ignored in
the mp4s.
00395.m2ts --cut--> 01.mp4
00305.m2ts --> 00.mp4 --cut--> 01.mp4
The two versions of 01.mp4 are very different. FFmpeg is making too many changes. Its changes are
unnecessary and, in this case, detrimental. In this case, I'm trying to test how badly ffmpeg is
making the cut, and all the changes are making that practically impossible.
For example, if 'v' (video) and 'a' (audio) packets go from
v-a-a-a-a-v-a-a-a-a-v... to
a-a-a-a-a-a-a-a-v-v-v..., then somethings wrong, eh? That's the kind of difference I'm seeing
between the two versions of 01.mp4.
I have to stick with m2ts but I have to cut it down to just 34.076 seconds. I need to do that
without altering the internals of the packets
there is tsMuxer, it seems to have is own logic for dealing with mpeg
transport streams.
https://github.com/justdan96/tsMuxer
There is also another libav* based cutter VidCut
https://github.com/kanehekili/VideoCut
Thank you, Andrew. I'll take a look at them.
May be stream is ... slightly broken in some way? Even costly pro software
at some version can produce slightly ... confusing stream.
The m2ts is definitely strange in some way -- ffmpeg complains about the audio streams for example
-- and it's doubly strange because the video is a Criterion movie.
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