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The maximum number of subpicture lines for PAL is 573, you lose two at the top, and one at the bottom. This means the biggest display area is 0 2 719 574
It's alright to use bmp's that are larger, you just have to determine which line(s) to lose.
In your case, since the bmp's have 574 lines, I would recommend:
Pixel_Area (1 573)
Display_Area (0 2 719 574)
And Muxman will accept them, cropping off the top line.
Muxman complies with the specs, so if this is what subresync produces, it should change.
Auto pan/scan and auto letterbox are methods of displaying 16:9 video on 4:3 displays. Scenarist and Muxman both require either:
a) 16:9 video and a Picture_Display_Extension header (specifies the horizontal offset)
b) Sequence_Display_Extension indicating display horizontal size of 540
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