230624 2021-09-22 06:28:44 -0700 MediaStream canvas.captureStream() for Canvas element provides frames too late 2021-10-01 03:25:32 -0700 1 1 1 Unclassified WebKit WebRTC WebKit Local Build Unspecified Unspecified REOPENED https://bugs.webkit.org/show_bug.cgi?id=230613 InRadar P2 Normal --- 1 kkinnunen webkit-unassigned webkit-bug-importer youennf oldest_to_newest 1796046 0 kkinnunen 2021-09-22 06:28:44 -0700 MediaStream canvas.captureStream() for Canvas element provides frames too late To observe, obtain bug 230613 testcase mediastream-canvas-to-video.html When canvas draws, the frame should go to the video. Instead it doesn't go anywhere. When the canvas draws a new frame, previous frame goes to video. 1798295 1 webkit-bug-importer 2021-09-29 06:29:18 -0700 <rdar://problem/83668648> 1799218 2 kkinnunen 2021-10-01 02:56:43 -0700 Will be fixed by bug 231022 *** This bug has been marked as a duplicate of bug 231022 *** 1799221 3 kkinnunen 2021-10-01 03:12:59 -0700 Scratch that, probably too risky. Should fix it separately 1799223 4 kkinnunen 2021-10-01 03:25:32 -0700 The frame should be captured and provided to video element during canvas display buffer preparation. However, at that moment the tree is already laid out. Submitting a frame will cause needs-layout assertion.