[Webkit-unassigned] [Bug 252063] New: [GStreamer] Don't emit playbackStateChanged() event after a seek

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252063

            Bug ID: 252063
           Summary: [GStreamer] Don't emit playbackStateChanged() event
                    after a seek
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eocanha at igalia.com

It is not possible to pause the playback during a seek. Sink elements lose their states entering ASYNC PAUSED->PAUSED transition. Calling HTML video.pause() during a seek doesn't result in pipeline state change call as player reports it's paused already. Forcing gst_element_set_state() doesn't really help in this case as pipeline enters inconsistent state after a seek that everything is playing but sinks are paused.

In addition, triggering playbackStateChanged() at seek end causes HTMLMediaElement::playInternal() that cleans up all signs of previous pause() call.

Don't emit playbackStateChanged() at seek end so HTML won't force playInternal() and HTMLMediaElement will call pauseInternal() again after a seek (from updatePlayState()).

This fixes following scenario:

video.currentTime = x.xx
video.play();
setTimeout(()=>{ video.pause(); }, 1} // ensure async duringn a seek (video didn't pause after initial seek had finished)

See: https://github.com/WebPlatformForEmbedded/WPEWebKit/pull/1013

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