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afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > video rate calculation ii
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Video Rate Calculation II
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gkrshnn
Junior Member
_ 		13. November 2003 @ 08:46 _ Link to this message    Send private message to this user   
I have found the following formula:

(Size - (Audio x Length )) / Length = Video bitrate

Here the Size (of the disc) is in KB.

So, 4.36GB,

is it equal to 4.36*1,000,000 KB

or, is it equal to

4.36*1,000*1,028 KB?

Or, is the 4.36GB equal to something else?

By the way, where did the 4.36GB come from?

Thanks.
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gkrshnn
vurbal
Staff Member

2 product reviews
_ 		14. November 2003 @ 08:23 _ Link to this message    Send private message to this user   
Companies that sell blank DVDs advertise/label them as being 4.7GB, which translates to 4.7 Billion Bytes. This isn't technically accurate, because your computer sees 4.7 Billion Bytes as 4.3772161006927490234375GB, therefore the amount of data you can burn to the disc is about 4.37GB. Many people use the number 4.36GB to allow a larger margin for error.

Basically, the manufacturer's number treats Bytes as a metric unit, meaning that 1GB=1000*1000*1000 Bytes, but since computers use Base2 numbers instead of Base10, Byte isn't a metric unit and the correct calculation is 1GB=1024*1024*1024 Bytes. That's not really important to understand as long as you remember that 1KB=1024B, 1MB=1024KB, 1GB=1024MB, 1TB=1024GB, etc,...
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Praetor
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_ 		14. November 2003 @ 11:30 _ Link to this message    Send private message to this user   
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afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > video rate calculation ii
 

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