[Webkit-unassigned] [Bug 160930] New: Safari fails bitstream switching of video streams under MSE if the resolution doesn't change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160930

            Bug ID: 160930
           Summary: Safari fails bitstream switching of video streams
                    under MSE if the resolution doesn't change
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rb at living.video

Safari fails bitstream switching of MPEG-DASH video streams under MSE if the resolution doesn't change.
Here are two sample files:
https://living.video/MPD/xxx1.mpd
https://living.video/MPD/fawsleyoverlay.mpd

With both dash.js and shaka players, these files corrupt on switching video representation in the resolution doesn't change (so, bitrate change only).
It switches fine if the resolution changes too.
The same files work perfectly in all other browsers tested on both PC and Mac, just fails in Safari.
We have labelled the video stream representations with a text overlay. Our streams labelled 1-4 are all 768x432 pixels. Our stream labelled 5 is 1280x720 pixels.
The video will switch from representations 1-4 TO representation 5 (and vice versa), but will fail if it switches between representations 1-4 which are at the same resolution.
This is a bug in Safari in handling the switch under MediaSource Extensions.

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