Steve Forde, Adobe product manager for After Effects, shares a tip for object removal (roto) using the Warp Stabilizer options for Synthesize Edges as a pseudo content-aware fill in After Effects.
See also Using Photoshop’s Content Aware Fill for After Effects by Luisa Winters. For older techniques see posts on the AE Portal archive. For more on the Warp Stabilizer, see especially Chris Meyer’s detailed video on Synthesize Edges, a research backgrounder with video in Subspace Video Stabilization, and Todd Kopriva’s outline of resources in Warp Stabilizer in After Effects CS5.5.
Here’s Steve with the new technique: