KVCD: How to do File Prediction for 2-CD Target? - digitalFAQ.com Forums [Archives]
 digitalFAQ.com Forums [Archives] KVCD: How to do File Prediction for 2-CD Target?

#1
02-10-2003, 06:50 PM
 Adder Free Member Join Date: Dec 2002 Location: UK Posts: 194 Thanks: 0 Thanked 0 Times in 0 Posts
Hi

How do i work out how to do 2 cd file prediction i.e. how do i calculate correct number of frames for each cd?

Thanks
Someday, 12:01 PM
 Site Staff / Ad Manager Join Date: Dec 2002 Posts: 42 Thanks: ∞ Thanked 42 Times in 42 Posts
#2
02-10-2003, 07:36 PM
 muaddib Free Member Join Date: Jun 2002 Location: Sγo Paulo - Brasil Posts: 879 Thanks: 0 Thanked 0 Times in 0 Posts
Use the file prediction method, but target your mpeg size for 1600-audio instead of 800-audio (for 80min CDs).
#3
02-11-2003, 12:36 AM
 jorel Invalid Email / Banned / Spammer Join Date: Aug 2002 Location: Brasil - MG - third stone from the sun Posts: 5,570 Thanks: 0 Thanked 0 Times in 0 Posts
Quote:
 Originally Posted by muaddib Use the file prediction method, but target your mpeg size for 1600-audio instead of 800-audio (for 80min CDs).

thank you !
#4
02-11-2003, 12:45 AM
 black prince Free Member Join Date: Jul 2002 Posts: 1,224 Thanks: 0 Thanked 0 Times in 0 Posts

Here's a sample speadsheet in excel. If you change cell B3 to 2
it's calculates the space for 2 CDs in B13. This speadsheet
works for both CQ_VBR and CQ

Quote:
 Sample File Prediction Spreadsheet ......A..........................B  ..1..Inputs ..2. ..3 No. of CDs.............................1. ..4..Audio File Size.......................99,000,000 ..5..Totals Frames........................152,255. ..6..Test Frames...........................2,544 ..7..Movie Length (seconds).........6350. ..8..Test File Size..........................24,053,987 ..9..Current CQ_VBR....................100 .10 .11..Results. .12... .13..CD.File.Size............................=813, 019,155 * B3... .14..Factor.....................................=@ Round(( B5 / ( B7 / 60 ) / 24,2) .15..Target File Size.......................=@Round((( B13  B4 ) / B5 ) * B6,2) .16..New CQ_VBR..............................=@Round(( B15 / B8 ) * B9,2).. .17..Diff %.....................................=@Round(( B15  B8 ) / B15,2). .18..Corrected CQ..........................=@Round(( B9 + B16 ) / 2,2). Enter data in Inputs. Results will give you the calculations. Use Corrected CQ for your next test. If Diff % is ~3% or less, you have come close to your Target File Size. If Corrected CQ is greater than 100, than use 100 the limit of Tmpgenc. Row 17 Diff % is format percentage, 2 decimal places. The other rows are format numeric with 2 decimal places.
-black prince
#5
02-11-2003, 12:52 AM
 muaddib Free Member Join Date: Jun 2002 Location: Sγo Paulo - Brasil Posts: 879 Thanks: 0 Thanked 0 Times in 0 Posts
Quote:
Headac3he will show you what will be the mp2 file size.
Lets say that your audio will be 100mb and you will be using an 80min CD.
CD capacity - audio size = 800 - 100 = 700
So you have 700mb for your mpeg video file.
That's it.
#6
02-11-2003, 01:14 AM
 jorel Invalid Email / Banned / Spammer Join Date: Aug 2002 Location: Brasil - MG - third stone from the sun Posts: 5,570 Thanks: 0 Thanked 0 Times in 0 Posts
Quote:
Quote:
Headac3he will show you what will be the mp2 file size.
Lets say that your audio will be 100mb and you will be using an 80min CD.
CD capacity - audio size = 800 - 100 = 700
So you have 700mb for your mpeg video file.
That's it.
very simple! ...for who knows.