Bug 248585

Summary:	currentTime progress even when playback has stalled
Product:	WebKit	Reporter:	Jean-Yves Avenard [:jya] <jean-yves.avenard>
Component:	Media	Assignee:	Jean-Yves Avenard [:jya] <jean-yves.avenard>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Other
Hardware:	Mac (Apple Silicon)
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=236722

Description Jean-Yves Avenard [:jya] 2022-11-30 22:22:57 PST

This problem got exposed in bug 236722.

In bug 236722, playback doesn't actually start unless the entire media has been fetched.
However, we can see that the progress bar is moving forward as if it did.

It shouldn't. Somehow we are not detecting that the underlying playback framework has stalled and we fail to notify the content process which in turn will incorrectly estimate the currentTime.

Comment 1 Radar WebKit Bug Importer 2022-11-30 22:23:25 PST

<rdar://problem/102846199>

Comment 2 Jean-Yves Avenard [:jya] 2022-11-30 22:29:26 PST

actually, this has already been lodged. It got fixed but changes were reverted

*** This bug has been marked as a duplicate of bug 230210 ***

Comment 3 Jean-Yves Avenard [:jya] 2022-12-02 15:13:40 PST

issue in bug 230210 can't be reproduced so let's start with a new bug

Comment 4 Jean-Yves Avenard [:jya] 2022-12-02 15:47:56 PST

Pull request: https://github.com/WebKit/WebKit/pull/7103

Comment 5 Jean-Yves Avenard [:jya] 2022-12-02 15:51:10 PST

problem can be seen when attempting to open the URL https://mediaserver.avenard.org/test/89041245.py?name=foo&stallOffset=100000&stallDuration=20&chunkSize=1024 , playback will not start until 20s after the first frame has been displayed

Comment 6 EWS 2022-12-06 02:23:45 PST

Committed 257403@main (384fb5b098b8): <https://commits.webkit.org/257403@main>

Reviewed commits have been landed. Closing PR #7103 and removing active labels.