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

[Limin Wang]

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Hi,


* Loren Merritt <lorenm at u.washington.edu> [2007-01-31 15:30:04 -0700]:

> >Now x264 support one SPS and PPS only, so it's ok in this case. If we want
> >to support more than one SPS and PPS, then it's too limited to configure 
> >the
> >both ids the same. I'm also confused why specs limit sps_id and pps_id
> >to different range, any good reason?
> 
> 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?



> --Loren Merritt
> 
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