Most files don't contain the values for transposing the coordinates
back to the positive quadrant so qtdemux was ignoring the rotation
tag. To be able to properly handle those files qtdemux will also ignore
the transposing values to only detect the rotation using the values
abde from the transformation matrix:

[a b c]
[d e f]
[g h i]

https://bugzilla.gnome.org/show_bug.cgi?id=738681