[Tudor “ted” jelescu]

Best if you set-up your project in AE – import the sequence, create a comp- then open the project in Adobe Media Encoder and render out from there what ever you need.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

Have you tried a different codec?
What version of AE are you running?

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

turn open GL off
use region of interest selection to update the image in the viewer only with your subject
get used to roto in AE being slow or get a roto package.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

You may also want to try Trapcode Starglow.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

You can check my work right here on the cow.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

Ok- so you have maybe a few issues to check on. If you are editing in Premiere CS5, there’s no need to export footage and then bring it in to AE CS5- you can just import the Premiere project and open the Sequence you want to work on in AE- it will open it as a comp with all your cuts as individual layers.
When you import footage in AE, you need to make sure that the frame rate of the comp, the footage and the output is the same. It may be that AE is set up on your computer to import sequences of files at 25fps while you rendered them at 30fps (for example), and that may throw off the sync.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

You can start by looking at this tutorial:
https://magazine.creativecow.net/article/building-a-3d-world-in-after-effects
Pretty much what you are looking for- all in AE.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

If you want to get specific answers, ask specific questions.
In your case, what are you thinking of shooting on a green screen- an object, a person, a group of people… How are you going to shoot them- camera on a tripod, dolly or crane, computer assisted movement… What is the type of 3D scene that you’re thinking of introducing the chroma footage in ( a stage, a room, a whole landscape…).
There are various ways of doing what you are trying to do, from really complicated and time consuming to pretty simple and straightforward stuff (if well thought in pre-production). So be specific and you will get help catered to your need.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

It’s all in the settings you have for rendering out your final piece. If you render to an uncompressed codec, like QuickTime Animation, then even a SD movie will play choppy on most machines – it’s just too much information to compute. You have a variety of possibilities to render your final piece. It all depends on your final use of the piece: DVD, play from a digital source, web…etc.
Adobe Media Encoder is the best option – open the AE project in it, choose the composition you want to render and the choose from the presets- flash video for web, mpeg2 for DVD, and a variety of others.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania

[Tudor “ted” jelescu]

If I understand correctly you are wondering how you can play with a premiere project in After Effects- if that is so, then it’s really easy. Just import the Premiere project in AE and open the sequence you want to work on. AE will open that as a composition with all your cuts as layers.

Tudor “Ted” Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania