[FFmpeg-user] Filter documentation -- PTSs

[Mark Filipak (ffmpeg)]

On 02/14/2021 08:19 PM, Phil Rhodes via ffmpeg-user wrote:
>   How does all this interact with files from cameras with very stable timing, such as broadcast and cinema cameras? ...

What is the antecedent of "this"? We've received no information yet, so how can you refer to "this"?

> Is there not a risk of long-term rounding errors?

Not for CFR I'd imagine. Perhaps that's why some informed folks advise to use solely CFR.

> 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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-- 
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.