KVCD: How to do File Prediction for 2-CD Target?

Adder · #1 02-10-2003, 06:50 PM

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

muaddib · #2 02-10-2003, 07:36 PM

Use the file prediction method, but target your mpeg size for 1600-audio instead of 800-audio (for 80min CDs).

jorel · #3 02-11-2003, 12:36 AM

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).

muaddib,
please,talk about "800-audio",i forgot to ask in my "pm".

thank you !

black prince · #4 02-11-2003, 12:45 AM

@Adder,

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

muaddib · #5 02-11-2003, 12:52 AM

Quote:

Originally Posted by jorel

muaddib,
please,talk about "800-audio",i forgot to ask in my "pm".
thank you !

Load your audio file in headac3he and choose the mp2 constant bitrate.
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.

jorel · #6 02-11-2003, 01:14 AM

Quote:

Originally Posted by muaddib

Quote:

Originally Posted by jorel

muaddib,
please,talk about "800-audio",i forgot to ask in my "pm".
thank you !

Load your audio file in headac3he and choose the mp2 constant bitrate.
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.

thanks Ademar!