[Webkit-unassigned] [Bug 199436] New: iPadOS 13 beta 3: Some Youtube Live streams do not work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199436

            Bug ID: 199436
           Summary: iPadOS 13 beta 3: Some Youtube Live streams do not
                    work
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattias.bergstrom at outlook.com

Created attachment 373386

  --> https://bugs.webkit.org/attachment.cgi?id=373386&action=review

Develop console log with MSE logging enabled

Live streams that have been going for some time (more than 1-2 hours) do not work on iPadOS 13 beta 3. They get stuck with a spinner, and never start. Newly started live streams seem to work fine, though.

Repro steps
- Open safari on iPadOS 13 beta 3
- Open any of the following urls:
    https://www.youtube.com/watch?v=lrX6ktLg8WQ
    https://www.youtube.com/watch?v=21X5lGlDOfg
    https://www.youtube.com/watch?v=d3_gK9MrXo8
- Observe that the video does not start

I attached a log from the safari developer console with MSE logging enabled. From what I can see it seems to be appending segments as expected, but this log line caught my attention:

[Log] MediaPlayerPrivateMediaSourceAVFObjC::seekCompleted(6792942B) waiting for video frame

Might be unrelated, but it seems like it gets stuck after seeking.

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