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Bitrate Questions

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Steven Free
Bitrate Questions
on Apr 12, 2006 at 2:39:48 am

Hello,
I'm all finished with 2 different video projects in Premiere 6.5 and ready to export them both from Premiere using the "Adobe MPEG Encoder" and bring them into a DVD authoring program called "DVD Lab Studio" by Mediachance. I will be burning a master of each to have DVD replications made down the road.

My question is how do I know what my audio bitrate should be set to http://www.videohelp.com/calc.htm so I can have a Calculated Bitrate?

Also, what is the difference between "Calculated Bitrate" and "DVD Max Bitrate" on that site?

Thank you


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Noah Kadner
Re: Bitrate Questions
on Apr 12, 2006 at 3:28:55 am

If you are using VBR, you set avg to calculated and max to max. For Ac3, typically 192Kbps is fine for stereo.

Noah


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George W.
Re: Bitrate Questions
on Apr 12, 2006 at 11:29:49 am

In that calculator you referenced, the item labeled "DVD Max Bitrate" is just a reference for how large your MAX video bitrate can be based on the dvd spec limit of 9800kbps (video+audio -- 10080kbps adding in subpics). Notice how it changes when you adjust the audio bitrate (it leaves a little room for menus and overhead). But I wouldn't necessarily use it for VBR MAX because you might be setting the video bitrate up to 9600kbps (and some encoders will periodically "spike" above your stated max number -- potentially making your dvd non compliant).

Also, if you plan to have a second audio track, make sure you change the number of audio tracks using the "Advanced" mode of that calculator.

Regards,
George


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Steven Free
Re: Bitrate Questions
on Apr 13, 2006 at 8:34:10 pm

I'll give it a try. Thanks!


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