On 17-07-2019 12:08 AM, Stéphane Chauveau wrote:
It seems that the pts value depends of the stream time_base so the
formula 'N*30' is probably not valid in the general case.
So if FR is not available in you meg file then I propose the following:
Find the time_base value with
ffprobe -hide_banner -show_streams -select_streams v input.mpg | grep
time_base
For example, that could be 1/1000
Then use the formula 'N/(30*(1/1000))' assuming fps=30 and
time_base=1/1000
If you get the right formula then the frame n=30 should have
pts_time=1.00 in the showinfo dump.
The constant TB is available, so to retime the stream as a 30 fps
stream, it would be
-vf setpts=N/30/TB
If a framerate value has been set then
-vf setpts=N/FR/TB
Gyan
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