some strange phrases in 1.2T

In the case of pinned transform behavior, a new viewport must not be 
establish.

Video at the native resolution given by the media shall then painted on 
a region whose center is the pin point and whose width and height are 
defined by the media

The first group will render a scaled and rotated video sequence on a 
viewer supporting video transformations while the second group will 
render the untransformed video on viewers that doesn't support video 
transformations.