[Mp4-tech] a doubt about a statement in the spec

[Gary Sullivan]

At first glance, it looks like this says "If A or B" where A and B are
synonymous, and therefore the form of the expression is
useless/confusing.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Alan Yan, Ying
Rui - SH
	Sent: Monday, November 13, 2023 7:08 PM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech] a doubt about a statement in the spec
	Dear Experts,
	I have a doubt about this statement in the spec. In 8.4.1.2.1,
it said that, 
	The motion vector mvCol and the reference index refIdxCol are
derived as follows.
	- If the macroblock mbAddrCol is coded in Intra macroblock
prediction mode or both prediction utilization flags,
	predFlagL0Col and predFlagL1Col are equal to 0, both components
of mvCol are set equal to 0 and refIdxCol is set
	equal to -1.
	About the red highlighted words, is it possible that an MB which
is not coded in Intra macroblock have both prediction utilization flags
equal to 0?
	I had thought that only Intra MB will have both prediction
utilization flags equal to 0.
	Could you please help to give an example please?
	Best Regards,
	alan
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