[Mp4-tech] [video] obmc and interlaced in ASP

[Gary Sullivan]

OBMC is not supported in ASP.  In fact there are NO PROFILES of MPEG-4
that support OBMC.  In my opinion, OBMC shouldn't even be described in
the standard if none of the 20 or so profiles support it.  The only
reason that it is there is that the standard was originally based on
H.263, which supports OBMC in some non-baseline profiles that were not
adopted into MPEG-4.  One persistent complaint that I have about
overviews of the standard is that they often say that the standard
supports this feature when in fact it basically does not.
Yes, interlaced video is supported in ASP, and I believe only for the
levels of the standard that support video resolutions that are typically
interlaced (e.g., HHI or BT.601 and above).
This would be documented in Annex N of the standard.  It doesn't seem to
be in the 2001 (2nd) edition of the standard, but it must be in the
current 2004 (3rd) edition, which is available at
http://tinyurl.com/6ccj3 for 364 CHF.
The MPEGIF resource page probably has pointers to conformance
bitstreams.  I believe those are publicly available.
Best Regards,
-Gary
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of ghvf jyg
	Sent: Thursday, September 09, 2023 5:37 AM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech] [video] obmc and interlaced in ASP
	Hi Everyone,
	I am working on Advanced Simple Profile (ASP). Does ASP support
overlapped motion compensation (OBMC), IIs interlaced support in ASP is
restricted to certain levels. Specifically where is this information
documented.
	I also want to know where I can find the complete set of
conformance streams for ASP. I could collect some from the Conformance
Streams CD from ISO (the old version), while I could get some from the
hannover ftp site. In all I have approximately 14-15 of them, where can
I find the remaining ones.
	I would appreciate any help on the above.
	Thanks and Regards
	Rahul
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