[Bug 773544] New: gst-vaapi elements not usable if nouveau module is loaded

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773544

            Bug ID: 773544
           Summary: gst-vaapi elements not usable if nouveau module is
                    loaded
    Classification: Platform
           Product: GStreamer
           Version: 1.9.90
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

While trying to test gstreamer-vaapi on a machine that has an nvidia board as
well, i discovered that vaapi fails to create a VA context because it's
apparently trying to use nouveau's gallium libva instead.

$ GST_DEBUG=3 gst-inspect-1.0 /usr/lib/gstreamer-1.0/libgstvaapi.so
libva info: VA-API version 0.39.3
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/dri/gallium_drv_video.so
libva info: va_openDriver() returns -1
libva info: VA-API version 0.39.3
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/dri/gallium_drv_video.so
libva info: va_openDriver() returns -1
0:00:00.028795439   376      0x1aeb040 ERROR                default
gstvaapi.c:234:plugin_init: Cannot create a VA display
Plugin Details:
  Name                     vaapi
  Description              VA-API based elements
  Filename                 /usr/lib/gstreamer-1.0/libgstvaapi.so
  Version                  1.9.90
  License                  LGPL
  Source module            gstreamer-vaapi
  Source release date      2016-09-30
  Binary package           gstreamer-vaapi
  Origin URL              
http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer

  0 features:

Running vainfo does work:
$ vainfo 
error: can't connect to X server!
libva info: VA-API version 0.39.3
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.39 (libva 1.7.2)
vainfo: Driver version: Intel i965 driver for Intel(R) Haswell Desktop - 1.7.2
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :    VAEntrypointVLD
      VAProfileMPEG2Simple            :    VAEntrypointEncSlice
      VAProfileMPEG2Main              :    VAEntrypointVLD
      VAProfileMPEG2Main              :    VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:    VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:    VAEntrypointEncSlice
      VAProfileH264Main               :    VAEntrypointVLD
      VAProfileH264Main               :    VAEntrypointEncSlice
      VAProfileH264High               :    VAEntrypointVLD
      VAProfileH264High               :    VAEntrypointEncSlice
      VAProfileH264MultiviewHigh      :    VAEntrypointVLD
      VAProfileH264MultiviewHigh      :    VAEntrypointEncSlice
      VAProfileH264StereoHigh         :    VAEntrypointVLD
      VAProfileH264StereoHigh         :    VAEntrypointEncSlice
      VAProfileVC1Simple              :    VAEntrypointVLD
      VAProfileVC1Main                :    VAEntrypointVLD
      VAProfileVC1Advanced            :    VAEntrypointVLD
      VAProfileNone                   :    VAEntrypointVideoProc
      VAProfileJPEGBaseline           :    VAEntrypointVLD

Blacklisting nouveau makes it work as expected.

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