https://bugs.freedesktop.org/show_bug.cgi?id=111213

--- Comment #8 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to KJ Liew from comment #6)
> I don't know how you had verified VDPAU to make sure it is working. Running
> vdpauinfo is not enough.

mplayer -vo vdpau the-video

See https://nouveau.freedesktop.org/wiki/VideoAcceleration/ -- "Using VDPAU".
(You also have to tell it to use the "vdpau" codecs.)

> $ LIBVA_DRIVER_NAME=vdpau VDPAU_DRIVER=nouveau chromium
> [19735:19735:0726/182126.662312:ERROR:vaapi_wrapper.cc(455)]
> GetConfigAttributes failed for va_profile 13
> [19735:19735:0726/182126.662353:ERROR:vaapi_wrapper.cc(455)]
> GetConfigAttributes failed for va_profile 6
> [19735:19735:0726/182126.662359:ERROR:vaapi_wrapper.cc(455)]
> GetConfigAttributes failed for va_profile 7
> [19735:19735:0726/182126.764805:ERROR:sandbox_linux.cc(368)]
> InitializeSandbox() called with multiple threads in process gpu-process.
> [19735:19735:0726/182126.808082:ERROR:buffer_manager.cc(488)]
> [.DisplayCompositor]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error
> from previous GL command
> romium/chromium --type=gpu-process
> --field-trial-handle=7302155616383548209,8433935369873353489,131072
> --disable-breakpad
> --gpu-
> preferences=KAAAAAAAAAAgAACgAQAAAAAAAAAAAGAAAAAAAAAAAAAIAAAAAAAAAAgAAAAAAAAA
> --service-request-channel-token=6382519074401266972:
> ../mesa-19.1.3/src/gallium/drivers/nouveau/nvc0/nvc0_video.c:43:
> nvc0_decoder_begin_frame: Assertion `ret == 2' failed.

Ah yeah, that's something else.

This appears like it would happen as a result of

   ret = nouveau_bo_map(bsp_bo, NOUVEAU_BO_WR, dec->client);

failing. No clue how that could happen... OTOH, I see messages about threads,
and certainly video decoding + GL in different threads is highly likely to be
broken with nouveau.

Please try to build a debug version, see if that yields more info. Also look
for errors in dmesg.

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