[Webkit-unassigned] [Bug 222781] New: MP4 transformation matrix ignored

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222781

            Bug ID: 222781
           Summary: MP4 transformation matrix ignored
           Product: WebKit
           Version: Safari 14
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chris at hiszpanski.name

Created attachment 422338

  --> https://bugs.webkit.org/attachment.cgi?id=422338&action=review

Sample video with 90 degree clockwise transformation matrix

The MovieHeaderBox and TrackHeaderBox within MPEG-4 both support transformation matrices. These transformation matrices enable movies or tracks to be rotated, amongst other affine transformations. While these transformation matrices are respected by Quicktime Player, Chrome, and other products, Safari and iOS do not appear to support them. For instance, the attached sample video specifies a 90 degree clockwise rotation via the TrackHeaderBox transformation matrix. While it plays with the rotation in Quicktime Player and Chrome, it does not in Safari or on iOS.

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