Issue with prerender in Sony Vegas

[littleheaven70.livejournal.com]

Hi guys, I'm hoping someone can please help me with an odd problem I've encountered in Vegas.  I'm running version 6.0b (build 126).  Because I vid with the raw vob files obtained with SmartRipper, the files are quite large and my preview is jerky and laggy.  That's fine, I've always just selectively prerendered my vid as I go.  I prerender a couple of seconds at a time so when I make changes I don't have to prerender the whole thing again.  Until now this has worked perfectly for me.

But now, when I prerender a section, the I lose the prerender on the previous section.  It's like it will only allow me one prerendered section at a time.  I've checked the folder where the prerendered files are stored.  It's empty and the drive it resides on has loads of spare memory, so that's not it.  Have I accidentally pressed a button and changed something?  I have no idea how to fix it and it's driving me mad.  I've been using the software since it was known as Screenblast and have never encountered this before.

Any suggestions would be most appreciated.

Comments

[http://users.livejournal.com/_sharvie_/]

My best guess is that you accidentally clicked "Clean Up Prerendered Video" as it sits just under the "Selectively Prerender Video". Depending on what you selected when the box popped up you could have deleted all of your previously prerendered files.

I don't quite understand what you mean about prerendering a couple seconds at a time and then when you make changes you don't have to prerender again. As I understand (and just tested) any changes to the prerendered parts makes them jerky again. So I'm not sure if maybe you are also using the "Build Dynamic RAM Preiew". This behaves very differently though I have no clue how it actually works, it sorta sits on the clip and minor changes will not take you back to the jerky playback but keep the smoothness of a rendered clip.

If you are using Dynamic RAM preview I would suggest looking in the video tab of your preferences and making sure you have a higher number than 64 in your Dynamic RAM preview max. If you set it to 0 it'll turn off this function. I have mine set to 256. And if you aren't using it, it'll probably help this as it takes less time to get back to vidding and the clips hold the smoothness over changes.

Sorry I couldn't be more help. I bought v6 just so I could edit vobs and I went bonkers over how the clips freaked out when I simply scrubbed over them and the jerky playback. That was what finally convinced me to start using Avisynth and I couldn't be happier with it....now that I've spent several months figuring out how to use it. :P

Good luck!

[littleheaven70.livejournal.com]

Thanks for your response! I appreciate it very much :o)

I think I have worked it out. I was definitely using the selective prerender because I use the hot keys to activate it (shift + M) rather than the drop-down menu. However, it seems that since I updated to the most recent build of Vegas, I can no longer overlap my prerendered sections. Previously I would start one prerender a few frames before the end of the last one, so that I got no gaps between prerendered sections. But now, if you do that it deletes the previous prerender. So I discovered if I start the prerender a few frames after the last one, the software keeps both prerendered sections intact, and actually joins them up for me. Really, really strange. But at least I can do my vid now!

FYI, what I meant about prerendering a few seconds at a time was that if I made changes, I only had to re-prerender the section I had changed, rather than the entire vid, which would take ages. That way I can at any stage preview everything I've completed with lovely, smooth playback. Before I learned this, I agree, the jerky preview was really annoying!