Canon EOS Rebel SL1 18-55mm IS STM Lens Kit - Manual (Page 211)

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3 Menu Function Settings
Video snapshots
You can shoot video snapshots. For details, see page 197.
In Basic Zone modes, the settings available for [Sound recording] will
be [On/Off]. If [On] is set, the sound-recording level will be adjusted
automatically (same as with [Auto]). However, the wind filter function will
not take effect.
The sound volume balance between L (left) and R (right) cannot be
adjusted.
Both L and R record audio at a 48 kHz/16-bit sampling rate.
COP
Y