TMPGEnc CQ Setting

[BV2001]

Hi,

I think I am going to try CQ setting since I had read many post about it here. I want an average of 1800kps. What should I set now for high and low bitrate , also, what is the % ?? the default is 65% should I make it 80% or 90 %. I want the best possible quality.
thank you

[johns0]

Its too hard to set the average bitrate on cq,you`ll have to do a few test encodes of about 1 minute each in various parts of the movie and then do a rough calculation of the average you get from the sum of the test clips.80 cq is a good setting to start with.

[SatStorm]

Unfortunatelly, you can't calculate the average of any CQ encoding.
Some try hard to do it (see www.kvcd.net forum, Kwag and his friends try hard to succeed this calculation years now...), but honestly, there is no way for 100% prediction!

In practice, a mediocre 4 hour filtered avi @ 352 x 576 with 2000 min - 8000 max, end ups about one DVD - R disc with TMPGenc. But you can't count on this, there are times that end ups 2 GB and times that end ups 6 GB!

[flaninacupboard]

if you know you need an average bitrate of 1800kbps, then using 2 pass VBR on 0minimum 1800average and 2500maximum will be more suitable. CQ is good because it's quicker than a 2-pass encode - but in my experience is only useful if you have no target size in mind. so great if you're putting a short clip on a disc and there's no way you can fill it (although arguably CBR at the max bitrate will be better for that) or if you're storing video on a computer - for instance for a video server.

In fact for footage on a video server CQ is the best option - quick to encode and all your files will be the same quality if you maintain the same settings.