[Bug 785011] Sometime between 1.10.4 and 1.12.0 MKV video decode broke when mapping buffers to get pixel data

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785011

--- Comment #10 from Carsten Haitzler (Rasterman) <raster at rasterman.com> ---
oh btw... if you watch the garbage carefully... it changes over time that is
consistent with the video content changing. it's as if there is actually
decoded data there but in some totally bizarre layout/format ... i've seen
similar kind sof garbage when stride and plane offsets are totally wrong (this
is the case for vaapi btw - i figured out the plane offsets and stride values
are not correctly rounded to what the hw decoder actually uses - with some
guesswork i figured out the strides had to be 64byte aligned and plane was
similar - last i checked this was still broken with vaapi+gst just saying that
the effects i see are very similar visually).

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