[Bug 797312] vaapi: GStreamer fails to play HEVC video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797312

--- Comment #2 from Richard B. Kreckel <kreckel at ginac.de> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #1)
> Please provide additional information such as VAAPI support details, as
> reported by vainfo utility, and confirm which version of GStreamer you are
> testing. Ideally, test against newer libva and vaapi driver, as the issue
> may already been resolved.

This is libva-2.3.0 and GStreamer 1.14.4, both from Debian/testing:

$ gst-launch-1.0 --version
gst-launch-1.0 version 1.14.4
GStreamer 1.14.4
http://packages.qa.debian.org/gstreamer1.0
$ vainfo 
libva info: VA-API version 1.3.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_2
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.3 (libva 2.2.0)
vainfo: Driver version: Mesa Gallium driver 18.1.7 for Radeon RX 560 Series
(POLARIS11, DRM 3.26.0, 4.18.0-2-amd64, LLVM 6.0.1)
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :    VAEntrypointVLD
      VAProfileMPEG2Main              :    VAEntrypointVLD
      VAProfileVC1Simple              :    VAEntrypointVLD
      VAProfileVC1Main                :    VAEntrypointVLD
      VAProfileVC1Advanced            :    VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:    VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:    VAEntrypointEncSlice
      VAProfileH264Main               :    VAEntrypointVLD
      VAProfileH264Main               :    VAEntrypointEncSlice
      VAProfileH264High               :    VAEntrypointVLD
      VAProfileH264High               :    VAEntrypointEncSlice
      VAProfileHEVCMain               :    VAEntrypointVLD
      VAProfileHEVCMain               :    VAEntrypointEncSlice
      VAProfileHEVCMain10             :    VAEntrypointVLD
      VAProfileJPEGBaseline           :    VAEntrypointVLD
      VAProfileNone                   :    VAEntrypointVideoProc

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