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

[Gary Sullivan]

Andrew Palfreyman et al,
That is not allowed.  The SPS sets up basic things like picture size, which could be problematic to switch in non-IDR access units.  At the moment I don't have time to look up exactly where and how it is prohibited, but I am confident that it is prohibited.
Best Regards,
Gary Sullivan
________________________________
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Andrew Palfreyman
Sent: Friday, August 31, 2023 11:19 AM
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
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