Not sure why i purchased mipi cas v4l2 cameras for imx8mqevk, but is very slow on wayland shell camera application. how to speed this up on linux 4.19.35 kernel ?
You should get 4K at 60fps is you are using MIPI, maybe you are doing something wrong, also please update your linux BSP to L5.4.24 to have better performance:
i.MX 8M Evaluation Kit | NXP
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