On 02/14/2021 08:44 PM, Paul B Mahol wrote:
On Mon, Feb 15, 2021 at 2:39 AM Mark Filipak (ffmpeg) <[email protected]>
wrote:
On 02/14/2021 08:28 PM, Paul B Mahol wrote:
On Mon, Feb 15, 2021 at 2:23 AM Mark Filipak (ffmpeg) <
[email protected]>
wrote:
On 02/14/2021 08:13 PM, Paul B Mahol wrote:
On Mon, Feb 15, 2021 at 1:46 AM Mark Filipak (ffmpeg) <
[email protected]>
wrote:
On 02/14/2021 07:34 PM, Paul B Mahol wrote:
On Mon, Feb 15, 2021 at 12:50 AM Mark Filipak (ffmpeg) <
[email protected]>
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.
So, the PTSs are generated.
What is the formula? Certainly it can't be anywhere nearly as complex as
the differential equations
and boundary conditions that control air flow through a duct of
arbitrary
shape or the air flow
across an aircraft wing of arbitrary profile. I guess if I can handle
those, I'll be able to handle
the generated PTSs of a periodic series of frames, eh?
You need TB aka timebase too.
TB is rational.
PTS is 64bit integer.
Thank you, Paul. I promise I can handle it. What is the formula?
See source code of telecine filter. ...
I can't read 'C'.
... It is doing all calculations avoiding
floats.
But formula in floats are pretty trivial and straightforward to write.
Then my request should be easy for you. What is the formula?
Note that when you change pts in wrong way like you do, you need to change
timebase too
or you will get many problems out of nowhere.
Indeed. I unknowingly make mistakes because I'm ignorant. That costs me hours and days and weeks of
my life.
Look, let's be straight with each other. You developers made the decision that, unlike other video
tools, you will use PTSs & TBs in lieu of frame numbers. That was an excellent decision and I
applaud it, and I applaud you. But if I can't predict and control PTSs & TBs, then I'm disarmed.
Surely you see that, eh?
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