Help For Optimized KVCDs
 

Hi All!

Yesterday I again tried to encode "The Big Lebowski" using the KVCD Template with a CQ of 74. The filesize came out 716 MB... :((

I bet you all know that sh....

I was wondering if there is a simple method to calculate the CQ you can use in company with a certain Min. and Max. Bitrate to fit a movie on one CD-R...

For Example :

677 MB as .avi ---> with min. 0 max. 1450 CQ 74 ---> 716 MB as .mpg

Or if there's no method why don't we just make a big LOG file online where we all post our recent encodings with the settings we used, and the filesizes of the output files...

hi jellygoose,

Did you mean that it came out to 816mb? Because 716mb will easily fit on a cdr with room to spare! You could probably even get the 816mb to fit with overburn.

That's a good idea to keep a log of the temps used and final file sizes of movies- I'll start keeping notes on that

Unfortunately, there is no way to predict the final file size precisely ahead of time while using CQ mode. The best you can do is to encode a small portion of the movie (say, 1000-2000 frames), and then extrapolate to the final filesize from that, and adjust accordingly.

I was wondering if it is better to use a higher CQ for best quality or a higher max. Bitrate. I know you gotta compromise but what do you guys think is the better way to go?

Higher CQ with lower Max. Bitrate, or higher Max. Bitrate and lower CQ ?

I'm kinda confused now. The normal CD-Rs I buy are 80 min. CD-Rs and you can burn 700 MB on them I think... Or am I wrong here, just tell me...
I heard about those 800 MB CD-Rs.

I never tried that overburning thing... Do you think I could overburn 16 MB ??

A 80 minute CD-R is normally 700MB. That's for data and audio CD's. For VCD's, it gives you 800MB, because it's burned in a different format. And a 74 minute 650MB CD gives you 740MB for VCD.

kwag

Good question... and I'm not really sure. As a rough guideline, Kwag has determined that adjusting the CQ by 4 results in about ~100meg change in resulting filesize. I'm not sure there are guesstimates about what size changes occur from bitrate adjustment, as I think I've seen most people adjust the CQ.

This is especially interesting in the case of the KVCDx2 template, because it is already running at a very low CQ of 50, so if you are over by just a bit, bitrate is really the only thing you can change... I don't think CQs below 50 would give enough quality.

I found reading this post very helpfull in regards to your question

http://www.kvcd.net/forum/viewtopic.php?t=184&start=18