We use Vegas some and I can tell you that Vegas doesn't like quicktime files (it will read them but it's slow and will eventually require a render), and works best with AVI files. So decide what format/codec you're going to be editing with on Vegas and render to that from After Effects. If it's HD, the most efficient codec is the Cineform codec that ships with Vegas. If it's SD, you could use anyone of a half-dozen codecs depending on your system setup, from uncompressed to software codecs like Matrox DVCPro50 (freely available online) or combination hardware/software based codecs like Blackmagic's, which are also freely available online.
So if you're using capture hardware with Vegas? (Like a Blackmagic card) definitely use the Blackmagic codecs coming out of AE. But even without their hardware, you can find and install their software only codecs.
I never thought about the rendering can be based on my hardware.
I badly don't know where i can look up what hardware stuffs i have, i'm not good at computers really.
But i'm running an old laptop, and have the graphic card
"Mobile Intel(R) 956 Express Chipset Family".
Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz
ACPI Miltiprocessor PC
The size i'll do is going to be 480x270 and another will maybee be 1280x720.
Any ideas of a codec that might be great?
I just tried render with uncrompressed, a 8 secounds comp with just a picture inside, made 89 MB in size which is pretty much.
So i think i may use codec.
Well I was talking about video capture hardware, not your computer's graphic display. So if you're on a laptop, you're likely software input/output only.
For the HD resolution, Cineform is the best to output to as it's great quality (compressed but still looks amazing), and should play back in real-time. I'm not sure if AE will find and use the Vegas installed Cineform codec though, so another option if it can't render to that is to render uncompressed, then setup your Vegas timeline using Cineform and just render to that inside in Vegas.
On the smaller size, you could probably go uncompressed and be fine since it's a small pixel resolution.