I found that if Anti-alias ratio could be set to a certain %
to obtain my image below Anti-Alias ratio the subtitle would look perfectly clean & Clear on TV or PC

but i couldn't find the Ratio % to set it this way, do you know what is this Ratio?
you look at the inner line of outline is all the way 1px all around the font body

This Subtitle image is Extracted From Region 3 Taiwan Commercial DVD
Where i replace the dark Gray Outline with red for you guys to see
Original color before i replace red for everyone to see the inner black outline
Outline = Dark Gray 1f1f1f
Anti-Alias = Black 000000
Body = Grayish White e5e5e5
BG = redish e63f07

Sample Image SUP zoom x2 in dvdsubedit