I captured a quick test file using Premiere straight to the hard drive. I open Premiere and After Effects and when I add the file to the timeline, I get these jaggies.
When I play the file alone in vlc, there are no jaggies so the file is fine. Vegas Pro displays it correctly. I even set the file to progressive and that doesn't fix it. So it's definitely an issue with Premiere and After Effects. I can fix this in AE by applaying a deartifacter plugin. But i shouldn't have to do this. Why is Prem/AE screwing with the file?
If it's any kind of anamorphic footage, I bet you're seeing artifacts from AE's "Toggle Aspect Ratio Correction" feature. It looks terrible in the viewer, but renders fine.
Look for this button under your composition viewer:
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events