Canon EOS REBEL T1 i/EOS 500D Instruction Manual page 121

Shooting Movies
Set the Mode Dial to
<."
> to
shoot movies. The movie file
format will be MOV.
o
SO Cards for Movie Shooting
When shooting movies, use a card with an SO speed Class 6
"CLASS@" or higher. If you use a card with a slower SO speed
Class, the movie shooting and playback might not work
properly.
Also, a large-capacity card is recommended for movie
shooting.
[i]
About Full HD 1080
Full HD 1080 indicates compatibility with High-
~
Definition with 1080 vertical pixels (scanning lines).
1080