[x264-devel] Re: [PATCH] add pps_id option and define sps_id and pps_id as uint8_t

[Limin Wang]

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* Loren Merritt <lorenm at u.washington.edu> [2007-01-31 20:04:55 -0700]:

> On Thu, 1 Feb 2007, Limin Wang wrote:
> >Loren Merritt [2007-01-31 15:30:04 -0700]:
> >
> >>I don't know why they need different ranges (since there's no penalty for
> >>having unused numbers), but I can guess why you'd expect more PPSs than
> >>SPSs. SPS contains properties of the decoded stream. PPS contains all the
> >>settings that only the codec itself needs to know. So I'd expect multiple
> >>SPSs only if you're concatenating video from different sources, but PPS
> >>could change within each source if different scenes have different optimal
> >>settings. (Ok, so the segregation isn't that perfect, but the idea
> >>stands.)
> >
> >Thanks, it sounds reasonable. So I think pps_id and sps_id value should be
> >decided by encode self instead of user configure. In order to get optimal
> >encode result, it's necessary to support multiple PPS also. right?
> 
> The reason it's configurable in x264 is because that's easier than writing 
> a program to take two streams with conflicting ids and renumber them so 
> they can be concatenated. (mp4/mov/mkv only. Containers without global 
> headers don't care if there are conflicting ids.)
> If x264 used multiple PPS, I'd still have to have an option to specify 
> which ids to use, until such a program exists.
Thank for your explanation. I'm missing container format.

 
> --Loren Merritt
> 
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