Support for the "ProjectionPoseRoll" element was added in MPC-BE 1.5.6.5997.
The wording of "ProjectionPoseRoll" is pretty confusing for the average user.
Matroska Element Specification
Quote:
ProjectionPoseRoll
Specifies a roll rotation to the projection. Value represents a counter-clockwise rotation, in degrees, around the forward vector.
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Here is a picture for illustration.
The vector is directed forward, rotating counterclockwise relative to the vector. Accordingly, the picture that is in front of the observer rotates clockwise. Did I understand everything correctly?
Maybe there are some clear and proven MKV samples?