RESOLVED CONFIGURATION CHANGED 235597
Capturing canvas through local peer connection to video element does not show first frame 
https://bugs.webkit.org/show_bug.cgi?id=235597
Summary Capturing canvas through local peer connection to video element does not show...
Kimmo Kinnunen
Reported 2022-01-25 10:42:23 PST
Created attachment 449941 [details] shows the problem Capturing canvas through local peer connection to video element does not show first frame 1) Load https://youennf.github.io/webrtc-tests/src/content/capture/canvas-pc/ 2) See teapot and black rectangle expected: 2) See teapot and teapot
Attachments
shows the problem (282.34 KB, image/png)
2022-01-25 10:42 PST, Kimmo Kinnunen 		no flags
Details
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youenn fablet
Comment 1 2022-01-25 23:56:40 PST
That is worth investigating, Safari and Chrome do not show the first frame but Firefox does. Looking at Safari, the peer connection does not seem to send the first frame so it seems the issue is on sender side. It might be a race between the time the track is generating the frame and the time the peer connection is set up, in which case there might not be anything for us to change.
:fippo
Comment 2 2022-01-31 03:30:55 PST
This particular sample has been long haunted by autoplay issues. Do you get the appropriate amount of teapots after running document.querySelector('video').play() ? Works in Chrome at least (which initially has .paused set to true the element)
Radar WebKit Bug Importer
Comment 3 2022-02-01 10:43:16 PST
<rdar://problem/88336856>
:fippo
Comment 4 2022-03-15 01:05:59 PDT
https://webrtc.github.io/samples/src/content/capture/canvas-pc/ has been updated with some heuristics to detect autoplay woes. Oddly dragging then only seems to show the first frame and then one needs to double-tap the right/lower teapot to make it update once?
youenn fablet
Comment 5 2023-05-15 04:40:21 PDT
I retried today using https://webrtc.github.io/samples/src/content/capture/canvas-pc/ and all three browsers seem to behave the same now (teapot only appears when a redraw is done). Closing.
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