You need to look at the export settings. You may be using a lossy codec which will have an impact on the output quality.
What settings did you use to export it from AE and PP?
In AE I added the clip to the render que and exported it with the standard settings. I just checked it says: best settings / lossless. But when I press on it it gives the format .AVI. With 25 frames. Is that the problem?
In PP the export setting were H 264, 25 frames and progressive.
The export out of AE still looks really sharp. But when I import it into PP and render the clip, it turns pixelated.
What is the best setting for a widescreen video (PAL)?
How will it be delivered?
Just use dynamic link so you dont have to worry about lossy rendering.
Preferably as an AVI. Or another small file size, which can be implemented into Powerpoint.
Avi is not small
I would go for wmv for Powerpoint.
Some versions of Powerpoint (windows) only take WMV or MPEG1. Mac powerpoint, only seems to like MPEG1 and MP4 files. Newer versions of Powerpoint may be different.
It's most likely an issue with your sequence / composition settings (Resolution, fps, and progressive/interlaced ). Make sure they are the same throughout.
In AE: Composition settings & Render setting
In PP: Sequence settings & Render setting
Premiere Pro can automatically create the sequence with the right settings using the rendered AE file. Just select New - > sequence from clip.
And when rendering, make use the input & output settings are the same.
Hope this helps.