[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 #15 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-05-24 14:23:05 UTC ---
Created an attachment (id=277113)
 View: https://bugzilla.gnome.org/attachment.cgi?id=277113
 Review: https://bugzilla.gnome.org/review?bug=679522&attachment=277113

qtdemux: parse tkhd transformation matrix and add tags if appropriate

This patch handles the transformation matrix using tags for the 90, 180 and 280
rotation cases. Those are very common with mobile devices recording. It is more
complete and has safety fixes on top of the current patch attached here.

I'm leaving this here as a partial solution to handle the most common cases,
but
we should think on a way to organize metas to handle
rotation/transformation/positioning
(or the transformation matrix as a single meta?). From my previous discussions
on IRC one
issue was how to define the order of metas to be applied to avoid unexpected
results like
subtitles being flipped together with the video.

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