[Nouveau] [Bug 82255] [VP2] Chroma planes are vertically stretched during VDPAU playback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82255

--- Comment #12 from Ilia Mirkin <imirkin at alum.mit.edu> ---
The source data is messed up. Just look at the luma/chroma planes that you
captured.

The overall image is 1280x544. Which means that each field is 1280x272. And
chroma would be 640x136

These look great:
gm display -size 1280x272 gray:sv0-texture0
gm display -size 1280x272 gray:sv0-texture1

These... don't:
gm display -size 640x136 gray:sv1-texture0
gm display -size 640x136 gray:sv1-texture1

Note that texture1 has *some* stuff in it... and trying to display it as

gm display -size 1280x68 gray:sv1-texture1

Shows *some* stuff, but not that much. Of course, vdpau *generally speaking*
works on vp2, so it's highly unlikely that the decoding step is entirely
broken. It must be some bit of sampler view setup, I guess.

I'm also guessing that you somehow messed up capturing the contents of the
chroma since it should have had 2 components, not 1 (which is probably why the
1280 stride works out for the chroma image that has something in it).

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