[Mp4-tech]Assign a LongTermFrameIdx to a short-term ref pic

[Gary Sullivan]

The intent is that this should never be possible (after the complete
operation of the decoding process of any picture).  We have one case in
the standard that has an editorial problem that makes it appear that
this might be possible.  But it should never be possible.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of luokai
	Sent: Tuesday, November 15, 2023 10:33 PM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech]Assign a LongTermFrameIdx to a short-term ref
pic 
	Hello, expert:
	When assigning a LongTermFrameIdx to a short-term ref pic
	it is said "... field_pic_flag is equal to 1, the marking of the
short-term ref field specified by
	picNumX is changed from 'used for short-term ref' to 'used for
long-term ref' ..."
	My doubt is can this situation happen: after this operation, top
field of a frame is "used for 
	Short-term ref" and bottom field of the same frame is "used for
long-term ref".
	Thanks!
	luokai
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