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reading S-VCDs is not a basic feature of any Windows OS ( not sure about 98SE/ME ) !!! A virgin Win2k installation can not read S-VCDs directly, only after installing WinDVD ( or whatever ) the OS gets these capabilities ! This is not true for VCDs it seems
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this cause windows comes with a built in mpg1 driver,
old mpg1 is free,while you have to pay for mpg2.
Would be easy to make one driver for both mpg1 and 2,
but isnt done for commercial reasons.
as avi mpg could contain almost every codec(and in fact the mpg1 format is very less simple than many think,old mpg1 drivers cant read many new mpg1)
only you cant just add a dll with the new codec,but have to rewrite all the driver,
so would be possible,i think,also to implement any mpg4 codec in a mpg1+2+4 or mpg1+4 driver,
with the advantage that it will be supported immediately from existing players and editors.