Flickering is usually due to Global Illumination solution varying between frames. There is no animation-specific cache to handle this yet, unfortunately. The current solution is to increase GI detail and/or increase GI Blur Radius. I suggest starting with GI settings of 2 for Relative Detail and 4 for Sample Quality, with a blur radius of around 50. Also make sure you have a quality of at least 1 in the Quality tab.
If that doesn't eliminate flicker, try increasing the Sample Quality to 5, and/or GI Blur to 100 or even 200. If that still doesn't do it, you'll have to try to work out a non-GI solution with fill lights.
- Oshyan
