Vegas Preview Problems

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Vegas Preview Problems

Postby xistareatthesunx » Wed Oct 04, 2006 4:15 am

Hi ^__^ recently when i've been using Vegas 6 or 7 to preview the clips i make, i've noticed that there are certain times especially round transitions that the framerate on the preview drops below 29.970 and by doing so it makes it very hard for me to edit as well as i can because i can't see what works and what doesn't so i was wondering if anyone knows how to fix this problem please let me know. Oh yea and if i render the project the video comes out fine. But i don't want to have to render everytime just to see how a small change looks
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Postby Willen » Wed Oct 04, 2006 4:58 am

You can try to take your preview window down a notch or two. Does it still happen in Draft?

If the quality or the size of the Draft preview is too small, then I think your only hope is some kind of hardware upgrade (this is assuming you are using a decent computer spec-wise and aren't trying to edit with AVS scripts (fake AVIs or VFAPI) which will probably lag in those spots since you have an intermediary program running).

Either a bigger, faster HDD is in order (or maybe try to do a defrag on the one you have now), or more RAM is needed. A CPU/mobo swap will improve things too, but then you are treading on new PC territory there...

btw, how is your footage encoded (if these are AVI clips you are using)? Huffyuv? Lagarith? Other? Or VFAPI/Fake AVIs?
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Postby CrackTheSky » Wed Oct 04, 2006 9:30 am

I have this problem too, on my relatively powerful Athlon 3200+ with a gig of RAM. There are two practical solutions to your problem, because simply decreasing the resolution of your preview window *probably* won't do it.

The first is to loop the region you wish to preview, go to the "Tools" menu, and select "Build Dynamic RAM Preview". This will devote a portion of your RAM to rendering the looped region at the full 29.97 FPS. Depending on how much RAM you choose to give over to this option (the amount can be changed in "Options > Preferences > Video > Dynamic RAM Preview Max"; at least 64 MB must be left for Vegas to function), you can render a larger loop. This is one way.

The second way, and the one I find to be much more practical, is to loop the region you want previewed and render it into an AVI file. This is what I do; for example, the file that I have for my RahXephon video is called "RXLoop", and whenever I want to preview a section I've just completed at the full FPS I just render over the old "RXLoop". It takes less than 20 MB with Lagarith-encoded video clips (larger for HuffYUVencoded clips).

I use the first option for more accurate editing; sometimes rendering a clip for precision editing isn't really the most practical solution because it takes too long and there's lots of guessing involved when it comes to synching. That's when the dynamic RAM preview is the better choice. When you just want to see how effects look and if everything is working correctly, rendering is your best option.

Hope that helped!
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Postby CrackTheSky » Wed Oct 04, 2006 9:31 am

I just now noticed that you said you don't want to render every time...so you can ignore a good portion of my last post. I still feel like it's a viable option.

:/
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Postby xistareatthesunx » Wed Oct 04, 2006 2:54 pm

first off i want to say thank you to everyone who replied to my thread.

Okay for Willen i doubt its my computer because i have a Pentium 4 2.8 GHz computer, and i have 2 gigs of ram. As for the actual project its running on a external mini HD thats 60 gigs in size with a 7200 rpm. So all in all its at the very least a standard computer. As for the codecs that i use when i encode, At the moment i am using a x264 codec. I was hoping to finish the project as x264 since its relatively small and when i was done with everythng go back and redo it with huffyv which should take very little time since the groundwork is already done.

As for Crack the Sky T___T. My dynamic memory has an entire gig dedicated to it :P. So i don't think i can give anymore to the program HAHA. And when u mean looping do u mean just highlighting the clip area i want to see and just render that portion?

PS: i prolly forgot to mention in my first post. But the x264 clips i import in work perfectly fine until i cut them and add transitions thats when they start to go haywire. As for the overall project the first 30 seconds work without a hitch transitions and all its just after that it starts to break apart T__T.

Again thnx for any help and advice you have given me i really appreciate it
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Postby xistareatthesunx » Wed Oct 04, 2006 3:03 pm

Oh yeah and i do use draft at the lowest setting for previews and this still happens
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Postby CrackTheSky » Wed Oct 04, 2006 3:36 pm

By looping I mean selecting only a portion of your video and either rendering or building a dynamic preview from it, instead of watching the video from the beginning every time. I assume you know how to do this; I think that's what you were describing to me. But in case you don't, all you do is click on the timeline and drag so that a blue box selects the part of your video you want to render/preview.

If none of those options satisfies you, I'm going to just say that you're gonna have to choose whichever one works best and stick with it, because the preview quality isn't going to change. Looping > Dynanimc RAM previews should be the best option in your case.
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Postby Willen » Wed Oct 04, 2006 9:27 pm

If doing the things that CrackTheSky recommends don't do it, then rendering the section is your only option. I assume you aren't using x264 for your preview renders?
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