[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 #19 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
The buffer is not invalid, and from the caps you can only get incomplete
information about strides/offsets in the general case. That's why I asked for
the code of your sink: if you only want the "default" values that you can get
from the caps, you must not claim supporting GstVideoMeta and GstVideoAlignment
in your sink for example. If you don't claim that, getting buffers with
strides/offsets different than the defaults from the caps would be a bug
elsewhere.

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