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Bit-rate calculator problems

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Jerel Peterson
Bit-rate calculator problems
on Nov 10, 2010 at 10:06:04 pm

I've always used the bit-rate calculator at GuyGraphics.com to calculate my settings based on the minutes that I want to put on a DVD, but somehow it's coming up wrong now. Either that or I'm doing something wrong.

The DVD is just for high school football games, so I don't have to have the highest possible quality. I've got 147 minutes to put on a dual-layer disc. The calculator gives me a calculated bit-rate average of 8130 kbits (audio at 192). My settings in Premiere CS5 for the MPEG2 export were:

minimum Mbps 7
Target 7.5 Mbps
Max 8.25 Mbps

Granted, the MAX is too high, but I thought that the Target of 7.5 would keep me well under the max. What am I overlooking? Isn't the conversion from kbits to Mpbs just a factor of 1000?

My entire project is coming in at about 9.25 GB.



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Daniel Ludwig
Re: Bit-rate calculator problems
on Nov 12, 2010 at 3:26:28 pm

Hi Jerel,
the bitbudget is wrong:

if you have 147min runningtime and 192kbit audio, that leads you to 7.2MBit average.

cheers

danny


PS: one of my german colegues created a nice mac-app for butbudgeting, called simple bit-budget - give it a try on google ;)


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