Rendering .avi... quick question

PainterPaul wrote on 2/19/2004, 8:05 PM
Just wondering…

Through reading and corresponding on this forum, I was under the impression that when re-rendering an .avi after changes have been made, only the altered part of the .avi would be rendered, and the rest (already rendered) just copied. I am into my second hour of a render, after making only about a fifteen-second addition to the Intro (I added a lower track of video to superimpose upon the upper track with some text).

Granted, the original 46 minute footage took about 3.5 hours to render (I’m looking at 2.5 hours now – so it is “slower” than before, but this is not what I expected.

What am I doing wrong if anything? I only added fifteen-seconds at the beginning of the track. I am rendering the entire file. Should I be doing something else?

Thanks as always.

Comments

PeterWright wrote on 2/19/2004, 8:20 PM
If you Selectively Prerender (Tools menu) this will only render where something has changed.

If you are rendering a complete avi, it will re-render the changed bit, then copy the rest (it still renders, but no new calculations ... - this part shouldn't take long - realtime at the most.)

Have you set something on the superimpose track which vegas thinks applies throughout?

If you don't need to have a single avi, another way would be to render a new avi for the first bit only, where you've changed things, then substitute this for the first part of the original avi.
Jessariah67 wrote on 2/19/2004, 8:24 PM
If you added something to the beginning of the PROJECT that took you 3+ hours to render, it will take you 3+ hours to re-render. If you just "add" something to the beginning of the rendered .avi and re-render, it will take less time than rendering the entire original project, but it will still take longer than it would to just render the 15 seconds you're talking about.

Unless you have pre-rendered sections, Vegas doesn't "remember" that it already rendered section X, Y, Z and nothing has changed...

HTH
Jessariah67 wrote on 2/19/2004, 8:27 PM
Peter finishes in first place...

To add to something he said, I have, at times on larger projects, rendered just a region that I wanted to alter, then placed it into or over (to replace) the section I wanted to change. A re-reender at that point is done almost in real time, and if you line it up properly, you see no signs of the edit whatsoever.
PainterPaul wrote on 2/19/2004, 8:49 PM
You guys are absolutely great!

I did not Selctively Render. I just added the Inro and rendered. So this is why I am re-rendering the entire file, hence so much time. Makes total sense, though I did not know about the selctive render part.

I am really trying to get this down. I have been rendering to .avi in order to save time all in all. (I like the idea of having backups (.avi).) I'm trying to organize my workflow in such a way as to render as I go (to .avi) knowing that after that is done it takes less time to render an mpeg2 for final burning. This is a different "view" in that all my clips/transitions etc. are not visable as they were in the original .veg file. Looking at 160 clips for a few days in the original .veg file is NICE. After rendering to .avi it all looks "bland". But since this time I have a rather large project, I wanted to save time. Thanks!

Any and all advice would be greatly appreciated. Like I said. You guys/gals are great. Thanks again.

Paul

I'm going to digest the responses. Thank you
PainterPaul wrote on 2/19/2004, 9:01 PM
Oh, one last thing. Selectively Render. Does this mean what it implies? Do I need to *select* the new parts first, and then render?
PeterWright wrote on 2/19/2004, 9:33 PM
Yes - if you define a looped selection it will go through this part only, and still only render where necessary.