[Bug 738681] qtdemux does not detect orientation

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738681
  GStreamer | gst-plugins-good | 1.4.3

Thiago Sousa Santos <thiagossantos> changed:

           What    |Removed                     |Added
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                 CC|                            |thiagossantos at gmail.com

--- Comment #2 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-10-20 09:04:39 UTC ---
Do you know what was used to encode/mux this file? The transformation matrix
isn't exactly correct and is being rejected.

x' = 0 * x + y + 0
y' = -1 * x + 0 * y + 0

For the corner input points (w is width, h is height):

0, 0 : x' = 0, y' = 0
w, 0 : x' = w, y' = -w
0, h : x' = h, y' = 0
w, h : x' = h, y' = -w

A rotation is happening but you can see that y is now ranging from -w to 0. The
correct way would be to have the matrix translate this into the 0-w range.
qtdemux can be fixed to handle this kind of matrix but it would be better to
fix the tool that generated this.

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