[Mp4-tech] H.264 DPB storage

[John Cox]

Hi Eric
>Hi Experts,
>I have two questions regarding the DPB storage.
>1. The standard specifiy the method to decide the maximum DPB slot count
>in Annex A, depending on the level value. Does this level means decoder
>level or bitstream level ?
Bitstream - otherwise you can have a mismatch between how the encoder
expects the DPB to be managed and what the decoder is actually doing.
>2. In Annex C, the DPB operation described is used for both reference
>picture and non-reference picture, is this an enforcement ? If I let DPB
>storing reference picture only, and create another mechanism for
>managing non-reference picture, and handle the reoder and
>no_output_of_prior_pics_flag, would this cause any decoder conformance
>problem ?
I can't see why having your non-ref pictures in other storage would
cause any problems as long as you allow for their reordering as if they
were in the DPB.  Beware of explicit MMCOs which can convert ref
pictures into non-ref pictures.
>Thanks very much for your answering in advance,
>Eric
> 

Regards
John Cox
SJ Consulting Ltd