Neg gun. To save up space, it seems AH films only record data at a fixed rate hard coded into it by HT. As such, it will appear jerky: quite annoying, but I like the film viewer anyhow.
Suggestion to HTC: make the "updates per second" for the films be user changeable - that way the user can decide how big he wants his films to be, and with it, how "fluid" they are.