[Mp4-tech] SPS switch on non-IDR I-frame?

[Ye-Kui.Wang nokia.com]

No, it is not allowed to change the content of an active SPS at non-IDR access units. SPSs may be repeated at non-IDR access unit, though. See the following paragraph in §7.4.1.2.1.
Any sequence parameter set NAL unit containing the value of seq_parameter_set_id for the active sequence parameter set RBSP shall have the same content as that of the active sequence parameter set RBSP unless it follows the last access unit of a coded video sequence and precedes the first VCL NAL unit and the first SEI NAL unit containing a buffering period SEI message (when present) of another coded video sequence.
BR, YK
________________________________
	From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of ext Andrew Palfreyman
	Sent: Friday, August 31, 2023 9:19 PM
	To: mp4-tech lists.mpegif.org
	Subject: [Mp4-tech] SPS switch on non-IDR I-frame?
	I'm unclear from the AVC spec whether or not it's legal to switch the active SPS on a non-IDR I-frame. There appears to be no issue with the decoders I've tried.
	Best,
	Andrew Palfreyman
-------------- next part --------------
An HTML attachment was scrubbed...
URL: /pipermail/mp4-tech/attachments/20070901/da9e9f47/attachment.html