[Bug 735379] mpeg2dec: use stride information from GstVideoFrame

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=735379
  GStreamer | gst-plugins-ugly | git

--- Comment #3 from Gwenole Beauchesne <gb.devel at gmail.com> 2014-08-25 13:44:04 UTC ---
(In reply to comment #2)
> (From update of attachment 284400 [details])
> Best to add a check for the other strides and error out (or copy!) if not
> matching

Well, fallbacking to copy would imply some more changes to further factor out
with the video cropping code. :)

So, I have currently error'ed out in the new patch. I would simply consider the
downstream allocator in error if it provides inconsistent/abnormal stride
information.

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