On Thu, Jul 4, 2024 at 10:44 PM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> On 04/07/2024 14.22, Paul B Mahol wrote: > > On Thu, Jul 4, 2024 at 8:05 PM Mark Filipak <markfilipak.i...@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. > You need to rewrite timestamps otherwise you get discontinuities. Also note that each frame have certain number of audio samples in it. > > Actually changing the audio frame's PTSes is going to be harder than hard. > > --Mark. > > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
