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A comment on A dumb reason computer vision apps aren’t working: Exif Orientation. Parent comment

Re:A dumb reason computer vision apps aren’t working: Exif O... by asveikau on Wednesday October 09, 2019 @10:42PM (#21210343)
It's been a long time, but I once wrote code to parse and rewrite ['rotate'] the matrices at a previous job.

The "Matrix Structure" is in the 'mvhd' atom.

See:

* https://developer.apple.com/library/archive/documentation/Qu...

* https://developer.apple.com/library/archive/documentation/Qu...

[Some of the best documentation for MP4 that I've seen on the web is from Apple, since it grew out of QuickTime.]

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