[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 #27 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Carsten Haitzler (Rasterman) from comment #25)

> is gst_video_frame_map() pretty much guaranteed for gst 1.0 and on? or was
> it added during a specific revision after 1.0?

That's supposed to work for all versions of 1.x, and the recommended way of
doing this. In addition you probably want to add code like this
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/sys/d3dvideosink/d3dvideosink.c#n466
(without the CROP meta and only until line 470!) to your sink for improved
performance (if you can indeed handle all strides/offsets). Without this,
various decoders will have to do an internal copy.

Nonetheless, it's a bug somewhere that you found here.

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