[Bug 774428] videoconverter: Segfault in orc when converting UYVY to I420 from a raw video in mp4 streamed over HTTP

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774428

--- Comment #10 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
This is an alignment problem probably. The src pointers passed in
convert_UYVY_I420() to video_orc_convert_UYVY_I420() are required to be 32 bit
aligned (we give them as 32 bit words to ORC!) but at the time it crashes they
are even odd here.

Similar the first two dest pointers must be 2-byte aligned (the two Y
destinations), but that's the case unless odd width (or someone decides to do
an odd stride... we don't prevent that, do we?).

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