[FFmpeg-user] Filter documentation -- PTSs

[Paul B Mahol]

On Mon, Feb 15, 2021 at 2:19 AM Phil Rhodes via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

>  How does all this interact with files from cameras with very stable
> timing, such as broadcast and cinema cameras?
> Is there not a risk of long-term rounding errors?
>

PTS and TB (timebase) are used together.


> P
>     On Monday, 15 February 2021, 01:13:37 GMT, Paul B Mahol <
> onemda at gmail.com> wrote:
>
>  On Mon, Feb 15, 2021 at 1:46 AM Mark Filipak (ffmpeg) <markfilipak at bog.us
> >
> wrote:
>
> > On 02/14/2021 07:34 PM, Paul B Mahol wrote:
> > > On Mon, Feb 15, 2021 at 12:50 AM Mark Filipak (ffmpeg) <
> > markfilipak at bog.us>
> > > wrote:
> > >
> > >> Disclosure: Everything that follows may be wrong.
> > >>
> > >> I reckon that, except for a few filters, the important metric is PTS,
> > not
> > >> the frame #s assigned at a
> > >> filter's input node nor its wall-clock arrival time at a filter's
> input
> > >> node. For example,
> > >> 'interleave' performs frame interleaves based on the PTSs of incoming
> > >> frames -- at least, that's
> > >> what I think.
> > >>
> > >> Am I correct?
> > >>
> > >> If so, wouldn't it be helpful if filter documentation included how it
> > >> generates PTSs?
> > >>
> > >
> > > PTS are not generated.
> >
> > ffmpeg -i SOURCE -vf telecine TARGET
> >
> > What are the PTSs of the first 5 frames at the output of the filter?
> >
> >
> Interpolated by very complex formula.
>
>
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