How to: Movie Cam
Go to the Command Line, and type in: -movie_cam
So you end up with this:
"C:\Program Files\Activision\Rome - Total War\RomeTW.exe" -movie_cam
To use the movie cam, just load a replay from a custom battle (remember it only works with custom and online battles). Once loaded, you will notice the movie cam is enabled when you see the blue text and all. Go Here
http://www.twcenter.net/forums/showthread.php?t=49260 for more info on using the move cam.
See also 1hHoplite’s movie cam guide here:
http://www.twcenter.net/forums/showthread.php?t=16473