[Webkit-unassigned] [Bug 209119] New: [Gstreamer]Youtube 'live stream'/H264 URLs fail to play, VP8/9 URLs play OK

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209119

            Bug ID: 209119
           Summary: [Gstreamer]Youtube 'live stream'/H264 URLs fail to
                    play, VP8/9 URLs play OK
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cbillington at emulti.net
                CC: bugs-noreply at webkitgtk.org

Arch Linux x86_64
Since updating to Gnome 3.36/Epiphany(Web) 3.36  Epiphany doesn't play H264 Youtube videos. 
Eventually YT message appears 'If playback doesn't begin shortly, try restarting your device'

These are usually 'live streams', since they are not often streamed using the YT-preferred VP8/9 codec.

An example is https://www.youtube.com/watch?v=9Auq9mYxFEE (Sky UK News live stream): 

'Stats for nerds' show the video codec as 'avc1.4d401f(136). Other live streams using this codec also fail. 

Tested using Epiphany/Gnome Web and also Webkit2gtk MiniBrowser (with default User Agent string) on two different systems with different Intel graphics carss.

Previously these kind of YT URLs worked with Epiphany 3.34/Webkit2gtk 2.26, though with noticeable video decoding delay relative to audio.

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