[Webkit-unassigned] [Bug 231019] New: [MSE][GStreamer] Honor MP4 edit lists

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231019

            Bug ID: 231019
           Summary: [MSE][GStreamer] Honor MP4 edit lists
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

This patch takes into consideration the GstSegment attached to a
sample to offset the PTS and DTS. This ensures accurate timestamps are
obtained for MP4 files containing edit lists (commonly necessary for
files containing video with B frames to have PTS starting at zero).

Before this was implemented, a workaround was in place based on a
heuristic (DTS = 0 && PTS > 0 && PTS < 0.1). The workaround is
preserved for the sake of content without proper edit lists, but
any edit list takes preference.

The time fudge factor has been modified from 0.083 seconds up to
0.100 seconds to accomodate the size of the empty edit in test.mp4
used by Web Platform Tests.

This test fixes improves expectation results and fixes two subtests in
imported/w3c/web-platform-tests/media-source/mediasource-remove.html.

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