WebKit Cocoa doesn't support change of resolution mid-stream 
https://bugs.webkit.org/show_bug.cgi?id=232916
Summary WebKit Cocoa doesn't support change of resolution mid-stream
Jean-Yves Avenard [:jya]
Reported 2021-11-09 17:08:54 PST
Seen in bug 231084. The AVFoundation only supports AVC1 content where the H264 SPS/PPS NAL are defined out of bound and static. AVC3 allows for SPS/PPS to be in-band and to have the content change mid-stream. We do not support those files and we can't detect a change of resolution.
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Radar WebKit Bug Importer
Comment 1 2021-11-09 17:09:40 PST
<rdar://problem/85230716>
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