digitalFAQ.com Forums [Archives] - TMPGEnc: CQ and CQ

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mjclark

10-26-2005 09:39 PM

CQ and CQ_VBR Mpeg Settings

Hi!Can somebody explain the difference between the simple Constant Quality setting and the Constant Quality_Variable Bitrate setting available in the TMPGEnc Mpeg setting options :?:
I thought that CQ had to use VBR anyway,so don't understand why there are 2 options here...
...But then again,there are a lot of things I don't understand...

kwag	10-26-2005 09:54 PM

HI mjclark,

CQ and CQ_VBR both are VBR, but with completely different bitrate distribution algorithms.
We found out a long time ago that CQ_VBR is optimal for resolutions of 352x240 and lower, while CQ is best for 352x480 and higher.
There's a whole thread about this in the forum, which explains all the tests we did, with a lot of samples.
Check here: http://www.kvcd.net/forum/viewtopic.php?t=2073

-kwag