[Libav-user] libavcodec usage inside Cinelerra-GG [LONG]

[Andrew Randrianasulu]

В сообщении от Sunday 03 November 2019 13:15:27 Carl Eugen Hoyos написал(а):
> Am So., 3. Nov. 2019 um 07:43 Uhr schrieb Andrew Randrianasulu
> <randrianasulu at gmail.com>:
> >
> > В сообщении от Sunday 03 November 2019 09:01:42 Carl Eugen Hoyos написал(а):
> > > Am Sa., 2. Nov. 2019 um 23:32 Uhr schrieb Andrew Randrianasulu
> > > <randrianasulu at gmail.com>:
> > >
> > > > I think I can also link in https://www.cinelerra-gg.org/bugtracker/view.php?id=330
> > > > because IMO it shows how wild timestamp can ruin synchro
> > >
> > > I tested the following and the output file has fine noise, no "pulsed noise":
> > > $ ffmpeg -ss 11:00 -i LD_160909_2.avi -qscale 2 out.avi
> >
> > Yeah, it should work in ffmpeg. This is why I posted this to Libav-user,
> > because Cinelerra _is_ libav user, from programmer's perspective ....
> >
> > https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=blob;f=cinelerra-5.1/cinelerra/ffmpeg.C;h=70098ca189c5267b3aeea8bfdb9de8ea19f051ff;hb=HEAD
> >
> > function int FFStream::seek(int64_t no, double rate)
> >
> > for some reason I saw timestamps even going negative.
> 
> For some files, this is expected but I don't see the code checking
> for AV_NOPTS_VALUE.
> 
> > Is it normal, for stream seek, or application must deal with this problem ?
> >
> >
> > AVRational time_base = st->time_base;
> >       int64_t tstmp = time_base.num > 0 ? secs * time_base.den/time_base.num : 0;
> >
> > for some reason stream's time_base was going from 1/25 to 1/30000
> > after seek, and this confused everything....
> 
> Did you already check how ffmpeg.c deals with seeking in this file?

How to do this? I only printed both parts of time_base in this function .... 
there was some commented out code probably doing seeking 'ffmpeg' way, 
but I don't know what exactly was wrong with this code - Cinelerra can deal with things like
multiprogram .ts file from tuner and I have no such files ....

For what exactly I should look?

> 
> Carl Eugen
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