NEW216874
REGRESSION: getUserMedia video does not display correctly if acquired immediately after stopping previous stream 
https://bugs.webkit.org/show_bug.cgi?id=216874
Summary REGRESSION: getUserMedia video does not display correctly if acquired immedia...
Sergey Tatarintsev
Reported 2020-09-23 06:11:18 PDT
Created attachment 409467 [details] Test case reduction If navigator.mediaDevices.getUserMedia called the second time immediately after the closing the previous camera screen, the call succeeds, but the resulting stream does not display correctly: - assigning it to srcObject of the video element does not start the playback - said video element does not emit any events Adding ~500ms delay between closing the previous stream and starting the next one fixes the problem. It also worked correctly without a delay on Desktop Safari 13. See attachment for reproduction. Expected result: camera stream is playing in the video element.
Attachments
Test case reduction (789 bytes, text/html)
2020-09-23 06:11 PDT, Sergey Tatarintsev 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2020-09-23 11:30:29 PDT
<rdar://problem/69447859>
Smoley
Comment 2 2020-09-24 17:43:16 PDT
Using the attached test case I am not able to reproduce this issue on Safari Technology Preview Release 113 (Safari 14.0.1, WebKit 15610.2.3.1). I see the LED indicator flash as the first stream ends and the second begins but the resulting stream seems normal.
Davy De Durpel
Comment 3 2020-10-07 06:45:12 PDT
I did these 3 tests: Safari 14 (15610.1.28.1.9) on MacOS 10.15.7 -> no issue Safari 14 on iPadOS 14.2 (latest public beta) -> no issue Safari 14 on iOS 14.0.1 -> black stream So it seems that the issue currently only exists on iOS 14 and not the 2 other operating systems.
youenn fablet
Comment 4 2020-10-07 09:53:46 PDT
(In reply to Davy De Durpel from comment #3) > I did these 3 tests: > > Safari 14 (15610.1.28.1.9) on MacOS 10.15.7 > -> no issue > > Safari 14 on iPadOS 14.2 (latest public beta) > -> no issue > > Safari 14 on iOS 14.0.1 > -> black stream > > > So it seems that the issue currently only exists on iOS 14 and not the 2 > other operating systems. This might be a playsInline bug. Can you fix your test case to use it? Currently it is set as playsline
youenn fablet
Comment 5 2020-10-07 09:57:27 PDT
Did a small experiment by setting playsInline to true. I had to call camera.play() to make it work.
youenn fablet
Comment 6 2020-10-07 10:11:35 PDT
It seems there might be a small amount of time where the session is interrupted and we do not transition automatically to play from autoplay.
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