On 2021-02-23 01:08, Mark Filipak (ffmpeg) wrote:
On 2021-02-23 00:41, Carl Zwanzig wrote:
-snip-
... 'Presentation time stamps have a resolution of 90kHz", so at 29.97fps the PTSs should be
3003.003... apart. Since they're whole numbers, that would be 3003, 6006, etc with an extra +1
every 333 frames.
Are those MPEG SCR counts or ffmpeg TB counts? Let's see...
1001/30000 = 33.3[6..]ms.
1/90000 = 0.011[1..]ms.
33.3[6..]/0.011[1..] = 3003 (exactly), so you are a little bit off.
You know, MPEG uses a 90KHz SCR (27MHz/300) for a good reason. The reason is so that all valid frame
rates (e.g. 30fps v. 30/1.001fps) come out as whole integers (not fractional).
The question is: What does ffmpeg use as its TB in the decoder and pipeline?
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