[Bug 679522] isomp4: Export transformation matrix

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=679522
  GStreamer | gst-plugins-good | git

--- Comment #23 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-05-30 15:37:17 UTC ---
I think I forgot in videoflip, but if I change the rotation, I should update
the rotation tag accordingly. Cluttersink/Coglsink would have to do that same
if they want to handle it auto-magically. This way we don't mess with
application that wants to handle it (and don't break Bastiaen work, just
disable it). In the future, elements that handle transformation matrix, would
have to reset the matrix too. The only risk here is that we might do-undo a
transformation if an app want to display in some other orientation.

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