MPEG-2 Variable Bit Rate Settings

[Mike Kujbida]

DVDA will take WAV files directly.
The option to do this is found in the Properties setting.
Be advised that you will have to lower your bitrate to allow for the increased audio file size (8,000,000 down to 6,840,000 for a 70 min. video).
If DVDA is set to AC-3 (the default) instead of PCM, it will pop up a recompress warning and then transcode it for you.

[Michael Spooner]

That makes sense. I would like to use AC-3, I’m just wondering whether the compression that DVD Architect uses is up to snuff, or whether it’s better to do the conversion with the Dolby Render plug-in inside of Vegas?

[Mike Kujbida]

Just like doing an MPEG-2 encode, it’s always better to it from Vegas as you can customize it to your heart’s content which you can’t do in DVDA.

[Michael Spooner]

Gotcha, thanks. Do you know if both applications use the same conversion software?

On another subject–I’m trying to smooth out 24p to see if I can get it to have more of the smoothness of 30p (what I’d like to use if it were in the DVD standard, but I’m concerned about keeping things universally compatible). I’ve tried both motion blur and supersampling in Vegas. For my project (panning across still images) motion blur just seems to fuzzy things up and doesn’t really do much for judder. However, I think I can see a difference when using supersampling, although I’m confused… I thought that supersampling only had an effect when using motion blur? At any rate, is there any draw back (other than rendering time) to turning supersampling up all the way (8) throughout the project?

Perhaps I should start a new thread on this.

[Mike Kujbida]

If by both applications, you mean Vegas and DVDA, the answer is is probably a “yes but” with the “but” being that Vegas has a lot more tools to allow you to customize pretty much any encoding setting.
DVDA simply says “I need to do this so I’ll do the quickest way I know how”.
Unfortunately the quickest way isn’t always the best way.

As far as the rest of your questions are concerned, I’ll plead a lack of competent knowledge about them.
A separate thread is a good idea as I there are users here that know a lot more about these topics than I do.

[Odd Magne nilsen]

Some people claims that if average is higher than 90% of max, one will not gain quality by using VBR.
And if one uses VBR, one should use 2-pass.

odd magne nilsen

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