Pre-render concept clarification...

kentwolf wrote on 5/2/2006, 2:28 PM
Please tell me, is the purpose of a pre-render to enable perhaps a particularly complex section of the timeline to "stay rendered" so it doesn't have to render again during the final overall render?

If the section is changed, that would either need to again be pre-rendered or rendered in the final render.

The prerendered section merely becomes part of the final render.

Am I correct on all of this?

I never use pre-renders, but I may start.

Thanks.

Comments

winrockpost wrote on 5/2/2006, 2:46 PM
I;d say you about nailed it. Problem is it is very ,very sensitive to changes made .
I use it like others may use ram preview
rmack350 wrote on 5/2/2006, 2:51 PM
Different NLE's treat things differently. Vegas' prerenders are very fragile and dissappear if you look at them sideways. This is because they are prerenders of spots on the timeline and if you change things at those spots the prerender is gone.

Also keep in mind that you get to chose the file format for the prerender and that a DV25 prerender is useless if the final output is something else. You may find that Uncompressed is the only universally useful prerender type but if you use it and don't have the disk throughput you'll have pretty poor playback of those prerendered sections.

Rob Mack
kentwolf wrote on 5/2/2006, 3:12 PM
OK.

Thanks guys!
apit34356 wrote on 5/2/2006, 4:11 PM
also be warned, using uncompress avi render to tracks, sometimes. one can have 5+rendertracks on top of each other, the events on top each other, will experience a serious performance hit vs dv25 avi.
kentwolf wrote on 5/2/2006, 6:14 PM
It almost sounds better to just keep like I've been doing and not pre-render and just wait it out. At least it will work right...

Thanks!
rmack350 wrote on 5/2/2006, 8:54 PM
I think it probably depends on the sort of render you do in the end, and it'd be worth doing some prerender tests.

What I found recently was that a DV25 prerender would be completely ignored if the final render was to something else. And that's a good thing. So try a few tests and figure out how your prerenders will work.

Personally, I don't think prerenders are worth putting a lot of effort into if the goal is just to speed up the final render. By the time you've got a project stable enough that the prernders won't just dissappear you're probably ready to render.

Rendering sections to a new track is much more useful because then it can be cut and it also responds to ripple edits, which prerenders don't do.

Rob Mack