[Mp4-tech] [H.264]A question about the "initialisation process for reference picture lists for B slices in frames"

[Tan Rui -- Huawei]

Hi, all experts,
When I read the 8.2.4.2.3 section about the ""initialization process for reference picture lists for B slices in frames",
I found the following description:
For B slices, the order of short-term reference entries in the reference picture lists RefPicList0 and RefPicList1 depends
on output order, as given by PicOrderCnt( ). When pic_order_cnt_type is equal to 0, reference pictures that are marked
as "non-existing" as specified in subclause 8.2.5.2 are not included in either RefPicList0 or RefPicList1.
I guess that when pic_order_cnt_type is equal to 0, the POC information must be extracted from the slice header. If the reference pictures are
marked as "non-existing", the decoder can not get the correct information from them. So that, the protocol said these conditions shall not be
included in either RefPicList0 or RefPicList1. Can someone tell me the true meaning in the protocol? Thanks.
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