Rendering resolution?

BPB wrote on 4/9/2004, 11:05 AM

I am rendering a project for import to DVD Architect using the Main Concept template..I selected 9,800,000 constant .. is this appropriate for the highest quality rendering for DVD ..Did i read somewhere that the highest setting should be restricted to 8,000,000? It's only a 40 minute video so time is not an issue. Thanks
bryan

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riredale wrote on 4/9/2004, 6:37 PM

BPB:

AC-3 comes in many different flavors, but the most common is 2-channel (stereo), which requires 192Kb/s. I just round it off to 0.2Mb/s.

BPB wrote on 4/9/2004, 7:47 PM

Speaking of flavors...What are the preferred settings for AC3..you mention 192K. Is this the common setting or are the audio specs set as high as possible after calculating the video needs.

Also can I render an AC3 and a PCM audio track and compare them in dvd ARCHITECT without re-rendering the video or are they muxed to the video track?
thanks for all this great information..this together with Douglas Spotted Eagle's Vegas 4 book and I'm about up and running.

riredale wrote on 4/9/2004, 10:18 PM

If you go to render an audio track on Vegas to the .ac3 format, you'll see all kinds of adjustments you can make. Basically, I'd select the "audio 2/0" mode at 192Kb/s, and leave pretty much everything else alone for now. The other setting I'd change is the "dialog normalization." The default is -27db. The way this control works is as follows:

--If you set it for -31, the audio on your DVD will be the same level as the audio on your finished video that you're converting to DVD.

--If you leave it at -27, the audio on the DVD will be about 4db down from your reference level.

--If you set it lower, like -10, the audio will be extremely low on the finished DVD.

I know, I know, it doesn't seem to make much sense. If you want to dig deeper, go to the Dolby web site and read some of the documents they keep there.

Some people like to change the compression setting on the "Preprocessing" tab. There's really no need. Look at the menu settings on your home DVD player. There is usually a setting for audio compression, so that, for example, you can watch "Jurassic Park" late at night without waking up the neighbors. All the Preprocessing tab settings do is tell your set-top DVD player what kind of compression to use IF you turn on compression on that set-top DVD player in the first place. In other words, don't worry about it.

By the way, Dolby stereo at 192 sounds very good. If you have golden ears that can tell a huge difference between, say, mp3 and wav, then maybe you'll be able to hear a difference. From what I read, most people can't.

BPB wrote on 4/9/2004, 11:42 PM

Thanks riredale..the -31 tip is excellent. I rendered at PCM and AC3 and compared in DVD architect..and I'm not so sure about the 'golden ear part' but I notice a huge difference..AC3 has a squashed and slightly distorted lowend and typical harshness in the high end..but I have done over a 100 cd's and audio is my business..video is a new animal to me but quite the challenge..thanks for your help. This video is from a Jumbotron system and is quite good on closeup but quite poor on long shots...i'm trying to keep as much quality there as possible..I'm pushing the limit at 8Mbps and PCM ..we'll see how it plays and I'll make a lower res version for backup, plus I'll have the full res AVI file and DV tape archive to fall back on.