[Wayland-bugs] [Bug 67190] [gst-vaapi] H264 video playback regression between 5fe72d9 and 0.5.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67190

--- Comment #17 from Gwenole Beauchesne <gb.devel at gmail.com> ---
Hi, I pushed something to the git master branch. It works, though I am not
fully satisfied yet.

Rationale:

- If VPP is not supported, or not available (libva >= 1.2.0, libva-intel-driver
>= 1.2.0), then we fallback to displaying the raw surface. This will be wrong
in most cases where video cropping or deinterlacing was needed. At least, we
now display something and no longer exit.

- If VPP is supported, then an intermediate surface is used to receive the
outcome of video processing. Currently, the target surface format is
arbitrarily set to YUV 4:2:0 (most probably NV12, under the hoods).

A future optimization is to use another format that would be more suitable to
the compositor, e.g. packed YUV 4:2:2 (YUY2). Though, we need to determine a
proper threshold/balance between extra memory bandwidth (YUV 4:2:2 requires
more bytes), or extra GPU/EU processing power (shaders are used for YUV 4:2:0,
but direct sampling from YUV 4:2:2 is possible on most hardware).

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