Creating a Bit Rate Calculator

[DoC hEx]

What would be a good source for reading material on creating a Bit Rate Calculator?

DoC hEx

[Nocturno]

These forums offcourse!

try a using a calculator to do the following:

example:
movie = 90 minutes and you want it on a 650mb disc,your audio will be encoded at 224 bitrate

bitrate= bits/sec
movielength= 90 minutes=5400 seconds.

you want to put it on a 650mb disc
1mb=1024 bytes, 1 byte = 8 bits
so 1 mb=8192 bits!
you have 5400 seconds and 650X8192 bits =(5324800 bits)
divide the number of bits by the time in secs and you have the bitrate! (986 bits/sec)
say your audio bitrate is 224 (svcd)
substract it from your bitrate (986-224=762)
et voila 762 is your video bitrate to fit 90 minutes of video on 650mb with audio at 224.

[Navellint]

hi Nocturno,
isn't there supposed to be overhead data added to your media streams? E.g. DivX+mp3 needs 7 MB overhead to mux everything. In that case 762 kilobit is too much. BTW, you forget 'kilo' in your stated bitrate ;-)

[Nocturno]

yep offcourse but i was just showing how easy these calculations are,
the overhead may vary, for dvd you need a lot more that 7 mb for example.. its just my way of showing the basics of bitrate calc