Bug 230624

Summary:	MediaStream canvas.captureStream() for Canvas element provides frames too late
Product:	WebKit	Reporter:	Kimmo Kinnunen <kkinnunen>
Component:	WebRTC	Assignee:	Nobody <webkit-unassigned>
Status:	REOPENED
Severity:	Normal	CC:	webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	WebKit Local Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=230613

Kimmo Kinnunen

Reported 2021-09-22 06:28:44 PDT

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.

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Radar WebKit Bug Importer

Comment 1 2021-09-29 06:29:18 PDT

<rdar://problem/83668648>

Kimmo Kinnunen

Comment 2 2021-10-01 02:56:43 PDT

Will be fixed by bug 231022 *** This bug has been marked as a duplicate of bug 231022 ***

Kimmo Kinnunen

Comment 3 2021-10-01 03:12:59 PDT

Scratch that, probably too risky. Should fix it separately

Kimmo Kinnunen

Comment 4 2021-10-01 03:25:32 PDT

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.

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