[FFmpeg-user] framecrc

[Paul B Mahol]

On Mon, Nov 13, 2023 at 11:33 AM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> On 11/13/23 04:04, Paul B Mahol wrote:
> > On Mon, Nov 13, 2023 at 4:33 AM <markfilipak.imdb at gmail.com wrote:
> >> Why are the target PTSs out of order?
> >> Why are there no 0 or 1001 DTSs?
> >
> > DTS is different from PTS.
>
> Indeed: Decoder versus Presentation.
> '-bsf:v setts' is before decoding, so there's both PTS & DTS, right?
> '-vf setpts' is after decoding, so there's no '-vf setdts', right? And
> '-vf setpts' applies to the
> pictures going to the encoder, right?
> Is PTS > DTS? Or is PTS <= DTS? I've seen it both ways in professional
> DVDs.
> What do you say, Paul?
>
> > And you should probably reorder DTS by keeping original order - just do
> > offset and not by using packet number.
>
> Then, of what use is '-bsf:v setts=pts=xxxx:dts=xxxx'? Why do they exist?
>
>
You can use expression and that allows numerous possibilities.


> I designed video hardware/chips at Atari in the early 1980s, so I know
> every detail of PAL & NTSC
> and I designed state machine sequencers to generate the signals -- pretty
> easy, actually. The
> engineers before me screwed the signals up and got Atari a bad name for a
> while.
>
> Maybe I don't understand how 'bit stream filter' got its name. Everything
> is a bit stream, so I
> don't really know to what 'stream' 'bsf' refers to. I've assumed that
> 'bsf' refers to the packet
> stream prior to decoding. Is that right, Paul?
>
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