Making a bitrate calculator!!

[shawnr10]

Im making a bitrate calculator but i don't know the exact formula, can anyone help me out?

[Conquest10]

theres already one.
https://www.videohelp.com/calc.htm

[shawnr10]

um yea i know, but i wanted to make my own, im sitting at home sick with nothing to do, doeas anyone know the formula?

[BJ_M]

well it can be figured out with some pretty basic math skills from the 6 or so calculators already posted and another 10- 15 found on the net ..

[ZippyP.]

You mean this:

Manually calculate the bitrate
The basic bitrate formula is

(Size - (Audio x Length )) / Length = Video bitrate
L = Lenght of the whole movie in seconds
S = Size you like to use in KB (note 700 MB x 1024° = 716 800 KB)
A = Audio bitrate in KB/s (note 224 kbit/s = 224 / 8° = 28 KB/s)
V = Video bitrate in KB/s, to get kbit/s multiply with 8°.

°8 bit = 1 byte.
°1024 = 1 kilo in the computer world.

Example
90 minutes video, L = 90 x 60 = 5 400 seconds
700 MB CD but be sure that if fits use a bit lower like 695 MB, S = 695 x 1024 = 711 680 KB
Audio bitrate, A = 224 kbit/s / 8 = 28 KB/s

(711 680 - (5400 x 28) ) / 5400 = 104 KB/s x 8° = 830 kbit/s.



That's right off the bitrate calculator page. 8)

[shawnr10]

yes, thats what i was looking for, however, it doesn't match up to any other bitrate calculator i've used so far. in fact no of the bitrate calculators give me the same bitrate. which one is correct?