GRRR Bitrate calculation

[mh2360]

I'm trying to create bitrate calculation sub-routine in VB 6:

MovieLength = MovieLength / 25# ' (PAL)

AudioSize = (((192000# / 8#) * MovieLength) / 1024#) / 1024#

VideoBrate = ((4454.4 - AudioSize) / MovieLength) * 1024#

MovieLength = the amount of frames
AudioSize is the size of the audio file in MB (192kps, im pretty sure that this is OK)

VideoBrate: This is where im going wrong, any help please?

[SaSi]

Your calculations look a bit strange:

MovieLength = MovieLength / 25

It looks like MovieLength in the right part of the equation refers to frames and MovieLength in the left part refers to seconds.

AudioSize is hardcoded for 192Kbps. Typical value, I don't argue, but for a bitrate calculator it should be a user field.

The calculation for AudioSize appears, otherwise, correct.

For VideoBRate I am at a loss. The bitrate calculator should provide a bitrate value for the video so that it fits to some value. You have chosen the DVD size in Mbytes.

4454.4 - AudioSize gives a value in MBytes.

You then divide this value by MovieLength, which should be a seconds value, giving a result in Mb / sec.

It is correct to multiply this by 1024 to reach a Kb/s value (kBytes / sec).

What you are missing is a multiplication by 8 to reach a kbits/sec value.