[Webkit-unassigned] [Bug 216088] New: REGRESSION <img src=mp4> with hvc1 and (some) avc1 do not load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216088

            Bug ID: 216088
           Summary: REGRESSION <img src=mp4> with hvc1 and (some) avc1 do
                    not load
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: colin at bendell.ca

All hvc1 and some avc1 encoded mp4s no longer render in <img src=mp4>. 
* https://colinbendell.github.io/webperf/animated-gif-decode/mp4.html
* https://colinbendell.github.io/webperf/animated-gif-decode/mp4_hvc1.html

The first link uses all avc1 mp4 files, while the second uses hvc1 payloads. Safari 13 loads these links properly but fail in Safari TP, and Safari 14.

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