On 2021-02-23 01:38, Carl Zwanzig wrote:
You missed mentioning the program clock reference (PCR) of the -ts. -And- many references to PTS
directly say that it's contained in a -ts (which if the -ts contains a -ps, is correct).
The answers are in a GIF illustration (not text) in the H.262 spec, so searching the PDF doesn't
find any hits. From the GIF,
In the encoder:
STC (System Time Clock) is 27MHz.
PTC is (STC counter value)+(fixed buffer delay) that's written into the PS at the start of each
frame. [1]
PCR (Program Clock Reference) is (STC counter value) that's written into the TS (in the muxer) every
100ms.
In the decoder:
STC (System Time Clock) is 27MHz.
There are no counters in the decoder. There's a STC-PTS comparator to signal new frames and a
STC-PCR comparator to control the STC's phase lock loop.
[1] Why the GIF leaves out the by-300 PTS divider is a mystery, but I know it exists (i.e., PTS
resolution = 1/(27MHz/300).
The question is: What does ffmpeg use as its TB in the decoder and
pipeline?
>
Read the source code? It's going to be in there somewhere.
But I don't like SPAM! -- I don't read 'C'.
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