Rotating videos using DRM/KMS on the Pi3 isn't trivial. I had to revert to using the VideoCore co-processor and its massive 64x64 register to improve performance to level comparable with the older firmware implementation. This blog post describe why that's necessary and how it works.
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Rotating videos using DRM/KMS on the Pi3 isn't trivial. I had to revert to using the VideoCore co-processor and its massive 64x64 register to improve performance to level comparable with the older firmware implementation. This blog post describe why that's necessary and how it works.