[Bug 764673] blacklist unsupported backend drivers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764673

--- Comment #3 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Holger Kaelberer from comment #2)
> That's a pity. We use gst-vaapi with vdpau-driver (on native NVIDIA driver +
> hardware) on several k installations which runs perfectly well for 'basic'
> video playback (vaapidecode ! vaapisink) for years.
> 
> I don't follow gst-vaapi development closely for maybe the last 2 years, but
> guess that the reported problems come from recently added features like GL
> texture sharing, postprocessing etc.
> 
> Would be great if a more fine-grained control of what is considered not
> working would be possible.
> 
> Also with respect to the underlying hardware. E.g. our experiences with the
> open source radeon driver + mesa vdpau state tracker are very bad when it
> comes to long running playback and robustness with discontinuous video data.

An environment variable as Tim mentioned shouldn't be an issue for you, right?

Which means, in order to get HW decode/enc/vpp support, all non-intel backend
users (until there is properly tested backends available) are supposed to
enable the environment variable.

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