CQ?? Confused...

[jonny_chief]

Am using TMPGEnc to create XSVCD and have found that i need to use CQ to get the best results, however the filesize always varies, i know this is supposed to happen but is there any way to regulate this?
I use a CQ of 65/100 and usuall set a max birate of 2500 and a min of 300, however i would like to know if there is a certain bitrate that i can use to keep the file size roughly the same all the time even on different movies?? I am trying to fit the most I can onto a 80min CD so around 800MB of Mpeg.
Can anybody help?
Also used FITCD to determine appropriate bitrate etc, but is FITCD referring to using VBR?? instead of CQ??
i presume so
any help appreciated

[Dave B]

A disadvantage of using CQ is that it is very difficult to predict the final filesize. CQ will allocate more bitrate to fast moving scenes than to more static scenes.

If you are working to exact media sizes (e.g. 1 or 2 CDs) then you may like to try using multipass VBR instead of CQ. TMPGEnc does an OK job but you should look at multipass MPEG2 VBR in CCE aswell. Using multipass VBR will guarantee that you fill a CD to the brim.

If you want to stick with CQ, you can sometimes get pretty close to your target size by eyeballing the movie and encoding little samples that you feel are representative of the movie as a whole. This will by no means guarantee you the final filesize but it may give you an idea.

[ya_jai]

I have used CQ all the time. I can tell you roughly about bitrate. BTW you range of CQ is so wide 65-100 what version of TMPGenc do you use? If version plus you need to bump to 100 or less but not too much, if older version you should set around 65 that should be enough.

Bitrate Max=2520 min=0 you will have around 40 mins
Bitrate max=2100 min=0 you will have around 50 mins
Bitrate max=1900 min=0 you will have almost 60 mins

On this depends on other setting as well such as audio bitrate, full screen, wide screen. I would suggest you test only short clip 2-3 mins first and compare the size what it will become for the whole cd.

[baker]

try m,y cvd guide for best results.

Baker

[wulf109]

Fit CD is calculating at CBR or average rates. I gave up on CQ because of it's un-predictabilty. One 50 min. video come to 800MB's but the next one from the same series will 1.2Gb's. I use 2-passVBR in Tmpeg and produces excellent resulrs. The bitrate you get from FitCD should be use as the average,min.-300,maximum I use 150% of the average.