[Webkit-unassigned] [Bug 185740] New: [MSE][GStreamer] Force segment.start = 0 after matroskademux

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185740

            Bug ID: 185740
           Summary: [MSE][GStreamer] Force segment.start = 0 after
                    matroskademux
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

This patch ensures that when WebM MSE media segments are appended in
an out of order fashion their frames are not discarded by opusparse or
any other potential elements downstream in the AppendPipeline that
perform segment clipping.

This patch fixes the following YTTV 2018 tests:

38. OpusAudioWithOverlap
39. OpusAudioWithSmallGap
40. OpusAudioWithLargeGap
70. VP9VideoWithOverlap
71. VP9VideoWithSmallGap

This patch is necessary, but not sufficient for fixing the following
YTTV 2018 tests:

36. AppendOpusAudioOutOfOrder
67. AppendVP9VideoOutOfOrder

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