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  #1  
06-27-2002, 08:09 AM
Jellygoose Jellygoose is offline
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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...
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  #2  
06-27-2002, 08:26 AM
rendalunit rendalunit is offline
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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
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06-27-2002, 09:39 AM
Daagar Daagar is offline
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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.
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06-28-2002, 01:52 AM
Jellygoose Jellygoose is offline
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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 ?
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06-28-2002, 01:58 AM
Jellygoose Jellygoose is offline
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Quote:
Originally Posted by rendalunit
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
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 ??
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06-28-2002, 02:12 AM
kwag kwag is offline
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Quote:
Originally Posted by Jellygoose
Quote:
Originally Posted by rendalunit
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
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
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06-28-2002, 09:25 AM
Daagar Daagar is offline
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Quote:
Originally Posted by jellygoose
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 ?
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.
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06-28-2002, 03:47 PM
Mr_J Mr_J is offline
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I found reading this post very helpfull in regards to your question

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