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.
<rdar://problem/102846199>
actually, this has already been lodged. It got fixed but changes were reverted *** This bug has been marked as a duplicate of bug 230210 ***
issue in bug 230210 can't be reproduced so let's start with a new bug
Pull request: https://github.com/WebKit/WebKit/pull/7103
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
Committed 257403@main (384fb5b098b8): <https://commits.webkit.org/257403@main> Reviewed commits have been landed. Closing PR #7103 and removing active labels.