[Webkit-unassigned] [Bug 160222] New: HTMLVideoElement with MediaStream src shows paused image when all video tracks are disabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160222

            Bug ID: 160222
           Summary: HTMLVideoElement with MediaStream src shows paused
                    image when all video tracks are disabled
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: All
                OS: Other
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gruan at apple.com

According to HTML 5 Spec https://w3c.github.io/mediacapture-main/#life-cycle-and-media-flow, "A muted or disabled MediaStreamTrack renders either silence (audio), black frames (video), or a zero-information-content equivalent."

Currently, when all MediaStreamTracks are disabled, the video renders a paused image from the last moment that the MediaStream had a track that was enabled.

It's preferred that the HTMLVideoElement render black frames for video, since 
- The MSE equivalent of de-selecting all tracks renders black frames.
- If a canvas is painted to from a HTMLVideoElement with all of its tracks disabled, it is painted black.

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