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Old 20th December 2010, 10:00   #2  |  Link
Dark Shikari
x264 developer
 
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Join Date: Sep 2005
Posts: 8,666
The primary purpose of QMs in MPEG-2 is to compensate for the horrible lack of precision in the MPEG-2 quantizer range at high qualities when the exponential quantizer scale isn't used.

Other than that, I consider them mostly useless.
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