Dynamic RAM Preview

mjroddy wrote on 9/20/2003, 6:38 PM
Dynamic RAM Preview seems to work quirky for me (quirkily?).
I build a little project with a chroma key, bkg, and titles. I place a region area and Shift+B. The area appears to render and waits for me to press the Space Bar. I do and it plays the same speed as before the render - sometimes. Other times, it works just fine. And I can't tell what I'm doing differently to make it work on those Othertimes.
And Sometimes, I'll place region around a hard cut and (from main event on track 3, to cutaway on track 2 back to main event) and it will build only to the cutaway.
I can typically get about 7-8 seconds of RAM Preview, and that last example only uses about 5 (1 sec before cutaway, 3 sec cutaway and 1 sec after).
I've Cleaned Up All Prerendered Video and that doesn't change things.
Any suggestions? -mjr

Comments

TheHappyFriar wrote on 9/20/2003, 8:49 PM
If you didn't already, change your preview windows to a lower setting (ie preview or draft). Those take up less ram per frame, then more frames can be rammed. :) For stuff that I need to see how it looks full screen, I preview with media player. I've made several NTSC DV templats for draft, preview, with and w/o audio, etc.
Very handy,
Chanimal wrote on 9/21/2003, 7:20 AM
In addition, you didn't mention how much ram you have available. You can change the amount of available ram for Vegas to use for RAM Preview at OPTIONS, PREFERENCES and select the VIDEO tab. The setting is the first window. I have one GIG and set this amount to 100 mb, leaving me over 800 meg left according to Vegas.

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XOG wrote on 9/21/2003, 1:14 PM
On my system, dynamic ram preview only renders the complete loop region if external monitor preview is TURNED OFF. Turned on, it renders up to the end of a transition, or to the beginning of a new scene.

Interesting.

XOG
mjroddy wrote on 9/21/2003, 1:39 PM
"On my system, dynamic ram preview only renders the complete loop region if external monitor preview is TURNED OFF. "
Ok. This is the same for me. So that makes a certain sence now that I know it's not just me.
I have 1Gig of RAM and my Dynamic RAM Preview Max is set to 895.
I don't really want to set the quality lower, because I'm finetuning a ChromaKey and really need to make sure that I'm not loosing detail around the hair and ears.
So now I know not to have External Monitor for a RAM Preview over transitions, but that doesn't explain yet about the slower playback even after a Shift+B.
I'll keep experimenting to see why it works sometimes. There must be a common denominator. Thanks for the help. -mjr
kameronj wrote on 9/21/2003, 7:23 PM
I had the same issue a while back. Sometimes I could get a minute preview to ram...other times, I could only get a few seconds.

Come to find out the only thing I was doing different was looking at the preview differently. When I had it in Draft mode, I got much longer RAM previews. When in "Best" - I could only get a few seconds.

So, I stick to draft, for the most part.

But if the RAM preview sucks, I usually just do a quick render to a WMV file of what I want to see - I pick one of the smaller settings (usually 512) and it renders really fast and gives me the preview I want.

Hope that helps.