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Incorrect rendering with vaapi + uyvy422

The attached sample plays well when using these command lines:

mpv --vo=gpu bbb_i.mp4
mpv --vf=format:nv12:convert=yes --vo=vaapi bbb_i.mp4

But when played like this:

mpv --vo=vaapi bbb_i.mp4

the rendering is broken: uyvy

In this case the compute_shader_video_buffer compute shader program is used by vlVaPutSurface.

From a quick look I'm not sure it's compatible with the uyvy layout (eg: I think it assumes 1 y value per pixel, while uyvy has 2) but I'm not familiar with this code.

(tested on radeonsi)

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