Maurus please not IF! you choose 528 or 544 as DVD widths like Phil does, then you shouldnt use GripfFit as Resize Calculator! As GripFits c++ code showed me that the PAR of 544 is calculated directly out of 3/4 PAR from 720 and thats not correct.
So if you resize to 528/544 widths (NTSC or PAL) do use FitCD in case of all other known widths you can use GripFit.
Btw .... IF the DVD Standalone also supports 528 widths in DVD Mode I never would use 544 widths in PAL as a lot of Pixels which are encoded will be finally out of the TV effective Display range. Its the same "logic" like when encoding 704 and not 720
768 = PAL max. Area (Overscan not included)
544 * (512/351) = 793!
528 * (512/351) = 770!
... means 528 is enough to match PALs needed 768 Area
768/(512/351) = 526,5 ... means the effective Picture Width area of 544 and 528 encoding shown on a PAL TV Device (overscan still not included!)