[FFmpeg-user] the trim filter

[Paul B Mahol]

Its in documentation: asetpts=N/SR/TB, assuming everything starts from 0,
so add it after each atrim.

On Thu, Jul 4, 2024 at 11:09 PM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> I meant the "broken non-IDR frame".
>
> On 04/07/2024 17.04, Mark Filipak wrote:
> > Paul, if I find a way to change only the audio frame's PTSes, what would
> I change them to?
> > Don't I want to simply drop them, instead?
> > _But_ if I use -noise=drop, I'll drop the video packets, too, and the
> video decoder will malfunction
> > because of the broken IDR frame.
> >
> > This is not a simple problem, eh?
> >
> > --Mark.
> >
> > On 04/07/2024 16.25, Mark Filipak wrote:
> >> On 04/07/2024 14.22, Paul B Mahol wrote:
> >>> On Thu, Jul 4, 2024 at 8:05 PM Mark Filipak <
> markfilipak.imdb at gmail.com>
> >>> wrote:
> >>>
> >>>> Is there some secret to the trim filter?
> >>>>
> >>>> --filter_complex "split=2[i5][i6],
> >>>>    [i5]trim=start_frame=481:end_frame=134047[o5],
> >>>>    [i6]trim=start_frame=138745:end_frame=246719[o6],
> >>>>    [o5][o6]concat=n=2"
> >>>>
> >>>> I get "dup=481", instead, and wind up with 20.061708[3..] seconds of
> black
> >>>> frames preceding the
> >>>> segment I want, and the frame rate is 19.181 FPS.
> >>>>
> >>>>
> >>> You need to rewrite audio timestamps, otherwise you get 'empty' gaps.
> >>
> >> Have you found an atrim expression that works?
> >>
> >> I tried adding atrim=start=20.062. Now playback goes for 20.061708[3..]
> sec of black frames, then
> >> freezes for another 20.061708[3..] sec, then continues as though
> nothing strange had happened.
> >>
> >> Actually changing the audio frame's PTSes is going to be harder than
> hard.
> >>
> >> --Mark.
> >>
> >>
> >
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