Chaos: A Mathematical Adventure* (2010) and Dimensions** (2008) by Jos Leys, Étienne Ghys, Aurélien Alvarez, et al. are excellent, CC BY-NC-ND 3.0-licensed (i.e., free) movies about math.
Chaos introduces determinism vs. indeterminism, the butterfly effect, and Lorenz attractors. Dimensions does a very good job introducing stereographic projection, fourth dimensional geometry, complex numbers, fibrations, and proofs.
Both films are dubbed and subtitled in various languages.
*downloadable from Archive.org, HD720p torrent, or HD1080 torrent
**on YouTube