Canon EOS M100 User Manual page 286

Cutting Off the Beginning/End of Movies
4
Choose the setting
item
[ ] → button
z
You can remove unneeded portions from the beginning and end
of movies. Note that digest movies cannot be cut off.
5
Specify portions to
cut
(1)
(2)
[ / ] → /
z
buttons to move [ / ]
[ ] is displayed.
z
Cut the beginning of
z
the movie (from [ ])
by choosing [ ],
and cut the end of the
movie by choosing
[ ].