[Mp4-tech] interlace field support in H.264

[Gary Sullivan]

Fields can be stored.  Certain pairs of fields are grouped together in
two special ways.  Those special pairs are called complementary
reference field pairs and complementary non-reference field pairs.  You
should read the details of the standard to understand how this stuff
really works.  The basic notion is that the decoder reference picture
buffer is considered to be constructed of memory areas that are
structured as frames.  When appropriate, two fields will be placed in
the same decoder frame memory storage area.  Fields can only be coupled
together for use as a reference frame when this is the case.  So the
model basically fits your structuring described in "(2)", rather than
"(1)".  But again I caution you to study and consider all the details
before jumping to any overly-general conclusions.
Best regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of pankaj bansal
	Sent: Tuesday, May 03, 2024 10:12 PM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech] interlace field support in H.264
	I have one doubt related to the decoded reference buffer in the
case of interlaced support. Is there only frames are stored or field can
be stored?
	for example suppose ref_buffer[8] is a buffer used to store the
decoded ref. frames or fields. Now which of the following thing can be
possible
	(1)
	ref_buffer[0] store frame1
	ref_buffer[1] store top_field(frame2)
	ref_buffer[2] store bottom_feld(frame2) ...........
	(2)
	ref_buffer[0] store frame(frame1)
	ref_buffer[1] store top_field and bottom_field of (frame2)
	thanks & regards
	pankaj
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