Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual page 184

3 Shooting Video Snapshots
Shooting duration
184
Select [Album settings].
3
Select [Album settings], then press
<0>.
If you want to continue shooting for
an existing album, go to "Adding to an
Existing Album" (p.187).
Select [Create a new album].
4
Select [Create a new album], then
press <0>.
Select the Snapshot length.
5
Press <0> and use <V> to select
the snapshot's length, then press
<0>.
Select [OK].
6
Select [OK], then press <0>.
Press the <M> button to exit the
menu and return to the movie
shooting screen. A blue bar will
appear to indicate the snapshot
length.
Go to "Creating a Video Snapshot
Album" (p.185).