[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 #9 from Carsten Haitzler (Rasterman) <raster at rasterman.com> ---
i'll give it a go... but i'm pretty certain i have garbage because the
converters on our side we use with libxine, libvlc and also vlc with shm
buffers, gstreamer 0.10 to... and even then given the exact same size, yuv
format, plane and stride values they work with an mp4, fail with the mkv.
changing zero code except downgrading to 0.10.4 from 1.12.0 fixes it. so i'm
99.99% sure the converters/display pipeline is right. if the only thing that
changes is gst version it goes from broken to working (if downgrading).

i'll give it a go to try save it out... but i'm pretty sure what the result
will be. it must have something to do with the code path we trigger because we
map buffers ... :/ i'll see about getsample.

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