Stick to DVD spec for subpicture size and position
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erikvullings
According to the specs subpicture size and position must stick to:
NTSC:
0 <= Start_X_coordinate < End_X_coordinate <= 719
2 <= Start_Y_coordinate < End_Y_coordinate <= 479
PAL:
0 <= Start_X_coordinate < End_X_coordinate <= 719
2 <= Start_Y_coordinate < End_Y_coordinate <= 574