[Mp4-tech] reg initialisation process for reference picture lists for B slices in H264 decoder

[Ashwani Gupta]

Thanks for your help
I still have one more doubt. But I am not sure whether this scenario will
occur or not.
Can this case is possible only the first two entries in list 0 and list 1 are
same while the remaining entries are different because under this condition
there will not be any swapping of the first two entries of one of the lists,
since both the list are not identical. Because if this is possible then in
this scenario how to decide which list has to be used.  
Best regards
Ashwani
________________________________
From: Gary Sullivan [mailto:garysull windows.microsoft.com] 
Sent: Tuesday, April 22, 2024 6:48 PM
To: Ashwani Gupta; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] reg initialisation process for reference picture
lists for B slices in H264 decoder
Clarification: There is not swapping "of these two lists".  There is swapping
of the first two entries of one of the lists (under the specified
conditions).
If we did not do this swapping, the first two pictures in both lists would be
the same (and in the same order) under these conditions.  The signaling of
which list to use (i.e. list 0 versus list 1 prediction) would just be waste
of bits.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Ashwani Gupta
	Sent: Tuesday, April 22, 2024 12:35 AM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech] reg initialisation process for reference picture
lists for B slices in H264 decoder
	Dear experts,
	I have one querry related to the Initialisation process for reference
picture lists for B slices in frames\fields in H264 video decoder.
	In the section 8.2.4.2.3 for frames and 8.2.4.2.4 for fields in the
standard, it has been written that when the RefPicList1 has more than one
entry and refPicList1 is identical to the RefPicList0, the first two entries
RefPicList1[0] and RefPicList1[1] are swapped.
	My querry is what is the significance of swapping the first two
entries of RefPicList1? I mean to say why this swapping of these two lists
are required?
	Could anyone help me to figure out this doubt? 
	With best regards
	Ashwani
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