Implementations
DivX Offers 1 warp-point GMC encoding: This enables easier hardware support in DivX certified and non-certified devices. But as 1 warp-point GMC limits the global transform to panning operation only (since panning can be described using blocks), this implementation rarely improves video quality.
Xvid Offers 3 warp-point GMC encoding: As a result, it currently has no hardware support.
Read more about this topic: Global Motion Compensation