Display area for sub-picture images in scenarist

[s_i]

I have a script file to import into scenarist. I am using subpictures of .jpg format. These images are of PAL Resolution (720 * 576). What should be the display area I should mention in the script? When I mention x1=0, y1=2, x2=719, y2=479, it gets multiplexed correctly but when I mention x1=0, y1=2, x2=719, y2=574, the sub picture encoder fails and gives error that the y2 value should be less than 480(NTSC). All the resolutions are PAL in my script. What can be the issue? How to handle it? How does display area affect the output?

[mpucoder]

You didn't say if this is a DVD or BluRay, or what kind of script file. But if it is an .sst file for a DVD the first 2 lines should read
st_format 2
TV_Type PAL

[s_i]

It is DVD and it is .scp script file. I figured out the solution. It was just that the format for specifying the Start time and duration which I was using was wrong. It should be hours:mins:seconds;number_of_frames