I'm importing a few screen grabs that I made using Snapz Pro video. The quality of the original file is great. But when I import it into AE CS 5.5, and then zoom in and animate it, it looks really, really bad ONLY when I render at 1/2 resolution.
If I did the same thing to images, they would look fine. But this movie asset (h264) looks horrible unless it's rendered at exactly 100%.
To be clear, this only happens at render, and in the preview pane when the pane or render are set to less than 100%. If I view or render at 100%, it looks fine.
Os X 10.7.3
H264 .mov captured with Snapz Pro Video
Rendering at half resolution, or previewing at half-resolution (also happens at other resolutiosn below 100%)
Mac Pro 12-core 2.93, 24GB RAM, Radeon HD 5870, 4 internal drives (7TB total), about 10 external drives (RAID and separate other drives)
I see that when you set the screen size to 50%, you also set the resolution to Half. What's it look like at Full?
And even on the 100% shot, the detail in the video really isn't much to write home about. Perhaps when you used the term "zoom" in your original post, you actually meant, "scale beyond 100%", and that's not good for any image.
It looks fine when previewing at 50% but leaving the resolution at full. But this defeats the purpose of using 50%. I'd be inclined to not call this a solution, but instead a workaround.
It appears to me that the real issue is AE not accurately scaling the video layer in preview and render. This looks like a bug, folks.