[Mp4-tech] HRD Bumpping Process

[EricChuang via.com.tw]

Dear experts,
I have two question about the HRD bumpping process.
1) In C.4.5.3, it desribes as following:
           - ....
           - If this frame buffer contains a complementary non-reference
field pair with both fields marked as "needed for output" and both
fields has the same PicOrderCnt(), the first of these two fields in
decoding order is considered first for output.
           - Otherwise, if this frame buffer contains a complementary
reference field pair with both fields marked as "needed for output" and
both fields have the sampie PicOrderCnt(), the entire complementary
reference field pair is considered first for output.
           - ...
My first question is that when a frame buffer contains a complementary
non-reference field pair, one of the field is considered first for
output. And when the frame buffer contains a complementary reference
field pair, both fields is considered first for output. Why they are
different ? To me it seems both fields can be flushed out no matter it
contains complementary reference field pair or complementary
non-reference field pair, because the bumpping process is just seeking
for a candidate of empty frame buffer,
2) The definition of POC is output order, I think it also means the
display order. When two fields having the same POC, how can I display
these two fields, merge them as a frame, and output, or output each
field individually.
Thank your for your comments,
Eric
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