[FFmpeg-user] Filter documentation -- PTSs

[Paul B Mahol]

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.


>
> Filter documentation should include:
> 1, More than just the names of directives (i.e. "options") -- some do,
> some don't,
> 2, Input specifications that include
> 2.1, The minimum number of output frames,
> 2.2, The number of output frames per input frame, and
> 2.3, Indication of the frames that are dropped (if any), for example:
> "first frame is dropped",
> "last 2 frames are dropped", etc., and
> 3, The mathematical formula employed to calculate output PTSs.
>
> I urge responses from all who are critical -- You know who you are!
> Perhaps someday we will be
> allowed to contribute. There are several of us who are critical. If
> allowed, we could resolve all
> issues for all filters in just a few days.
>
> --
> Any journey, no matter how long, is just a series of small steps.
> "Government is the problem!" -- 1982 and onward.
> "_______ is the enemy of the people!" -- 2016 and onward.
> "You have to fight like hell or you're not going to have a country!" --
> Jan 6, 2021.
> It isn't the distance that's important, it's the direction.
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