256695 2023-05-12 04:29:44 -0700 WebRTC backed media element rendering is slow to update to changes of layers (size or layer made hidden/visible) 2023-06-20 00:00:11 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 youennf youennf bfulgham eric.carlson jer.noble ltsg0317 pvollan simon.fraser webkit-bug-importer zalan oldest_to_newest 1954941 0 youennf 2023-05-12 04:29:44 -0700 WebRTC backed media element rendering is slow to update to changes of layers (size or layer made hidden/visible) 1954942 1 webkit-bug-importer 2023-05-12 04:30:04 -0700 <rdar://problem/109257177> 1954943 2 youennf 2023-05-12 04:31:12 -0700 It takes sometimes more than one second for rendering to be updated. I was able to see this with a recent Safari build on iOS when rotating devices (in which case the size of the video element may change). I was also able to see this on macOS when setting a video track to enabled=false. It takes sometimes more than one second to have the layer being hidden. 1954944 3 youennf 2023-05-12 04:33:04 -0700 I wonder whether this is related to changes we did related to CARenderServer blocking. Is there an easy way to unblock it and get back to the previous GPU based approach? 1957555 4 youennf 2023-05-23 23:33:09 -0700 There are LocalSampleBufferDisplayLayer logs at the time we enqueue video frames in the AVSBDL. It may take more than 5 seconds sometime to render the first video frame. 1957583 5 youennf 2023-05-24 03:28:48 -0700 This is a regression from https://bugs.webkit.org/show_bug.cgi?id=253761. Reverting https://commits.webkit.org/261709@main fixes the issue. When the page is blank at camera starting time in macOS, CADebug tells us that the "LocalSampleBufferDisplayLayer AVSampleBufferDisplayLayer parent" size is (0, 0). When the rendering is ok, the size is correctly set. What is strange is that LocalSampleBufferDisplayLayer sets its CALayer bounds in a timely manner, but it does not seem to show up in CADebug. At some point, rendering is updated, sometimes after 1 second, sometimes after 5 or more seconds. 1959003 6 youennf 2023-05-31 04:28:21 -0700 Pull request: https://github.com/WebKit/WebKit/pull/14534 1959266 7 ews-feeder 2023-05-31 22:58:08 -0700 Committed 264777@main (0e0d7976dfe0): <https://commits.webkit.org/264777@main> Reviewed commits have been landed. Closing PR #14534 and removing active labels. 1962503 8 youennf 2023-06-20 00:00:11 -0700 *** Bug 257885 has been marked as a duplicate of this bug. ***