[Webkit-unassigned] [Bug 196772] iOS 12.2 Drawing portrait video to canvas is sideways

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196772

--- Comment #5 from Jer Noble <jer.noble at apple.com> ---
Looks like the  video in question has a video track preferredTransform of: (a = 0, b = 1, c = -1, d = 0, tx = 1080, ty = 0), so rotated. I suspect that prior to the release of iOS 12.2, videos taken in portrait mode had an identity transform, and that if you played a portrait video captured in iOS 12.1 in the jsfiddle using iOS 12.2, everything would be correctly oriented.

We handle transformed tracks for MSE content by explicitly rotating the pixel buffers generated by a decompression session.  We may need to do the same for AVAsset-backed video elements.

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