[Mp4-tech] (no subject)

[Gary Sullivan]

It should be noted that if the SEI method of conveying timing
information is not in use, the system should provide equivalent
information in some alternative form.  You cannot properly study the
timing operation of a video decoder in a manner that is entirely
divorced from the concept of a delivery and synchronization system.
Thus the study of this topic becomes a somewhat system-dependent issue.
I suggest also taking care to study various things, not just
num_reorder_frames.  In particular, I suggest to carefully study
subclause C.4.  I suggest that max_dec_frame_buffering (and the variable
MaxDpbSize) is probably better to look at than num_reorder_frames, and
that the syntax element num_ref_frames may also be of some interest.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Dong Tian
	Sent: Wednesday, November 30, 2023 7:46 AM
	To: Qiu Qiuping
	Cc: mp4-tech lists.mpegif.org
	Subject: Re: [Mp4-tech] (no subject)
	Hi Qiuping,
	I happen to know something related to your question.
num_reorder_frames in VUI tells the decoder the minimum number of
pictures should be stored in the DPB before any output. The bumping
process specified in Annex C of the standard can ensure the correct
output order.
	BRs,
	Dong
	On 11/30/05, Qiu Qiuping <qpqiu trident.com.cn > wrote: 
		Dear Experts,
		  I have a question regarding h.264 decoder
implementation. How to output pictures in DPB to display, especially,
when there is no SEI information available?
		Who can help me, thanks.
		Qiuping Qiu
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