Formula for finding exact bit rate to Render

ScheffFrog wrote on 6/4/2013, 10:00 AM

I know sometime ago one of you explained a formula for calculating the maximum bit rate you can use to render a video and keep it within the limit of your media. I have wondered about using a bit rate of your own making instead of the numbers given you. Do you have to use an exact number, or can you use a number that will get you closer to filling up the DVD thus getting the highest bit rate possible.

Any help would be appreciated. Especially if someone knows the formula for figuring it out.

Thanks,
Ribbit.

Comments

cohibaman#1 wrote on 6/4/2013, 4:14 PM

Not sure if this is what you were looking for or can use, but check out the link below:

http://www.winhoros.de/docs/bitrate-viewer/index.html

musicvid10 wrote on 6/4/2013, 4:28 PM

"

That's not quite correct. The only way to predict a specific file size is done by knowing or calculating the average bitrate, not the maximum. Using constant bitrate is the same as average bitrate. Maximum and minimum variable bitrates don't figure into it at all.

That being said, here is the math:

Time (sec) X Avg. Bitrate (Mbps) X .125 = File Size (MB)

Note that bitrate is Megabits per second, and File Size is Megabytes, as is customary.
As there are other variables, this equation is only accurate withing a few %. Remember to add in your audio stream size!