[Bug 772076] New: playing videos breaks with with libva plugin (fglrx)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772076

            Bug ID: 772076
           Summary: playing videos breaks with with libva plugin (fglrx)
    Classification: Platform
           Product: GStreamer
           Version: 1.6.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gnome-bugs at digital-trauma.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Gentoo x84_64 system with AMD GFX card (R9 285).

gst-play-1.0 test.mp4 gives:

Press 'k' to see a list of keyboard shortcuts.
Now playing /home/user/Downloads/test.mp4
libva info: VA-API version 0.38.1
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib64/va/drivers/fglrx_drv_video.so
libva info: Found init function __vaDriverInit_0_33
libva info: va_openDriver() returns 0
Redistribute latency...
ERROR Cannot access memory for read and write operation. for
file:///home/user/Downloads/test.mp4
ERROR debug information:
/var/tmp/portage/media-plugins/gst-plugins-libav-1.6.3/work/gst-libav-1.6.3/ext/libav/gstavviddec.c(1242):
get_output_buffer ():
/GstPlayBin:playbin/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0/avdec_h264:avdec_h264-0:
The video memory allocated from downstream pool could not mapped forread and
write.
Reached end of play list.

vainfo:
libva info: VA-API version 0.38.1
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib64/va/drivers/fglrx_drv_video.so
libva info: Found init function __vaDriverInit_0_33
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.38 (libva 1.6.2)
vainfo: Driver version: AMD MMD 1.0
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :    VAEntrypointVLD
      VAProfileMPEG2Main              :    VAEntrypointVLD
      VAProfileMPEG4Simple            :    VAEntrypointVLD
      VAProfileMPEG4AdvancedSimple    :    VAEntrypointVLD
      VAProfileMPEG4Main              :    VAEntrypointVLD
      VAProfileH264Baseline           :    VAEntrypointVLD
      VAProfileH264Main               :    VAEntrypointVLD
      VAProfileH264High               :    VAEntrypointVLD
      VAProfileVC1Simple              :    VAEntrypointVLD
      VAProfileVC1Main                :    VAEntrypointVLD
      VAProfileVC1Advanced            :    VAEntrypointVLD

mpv --hwdec=vaapi runs fine, so it seems to be something gst specific.

By the way, is there a simple way to blacklist an installed plugin? I'd like to
disable vaapi while it's not working without just deleting it and fighting my
package manager.

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