Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 258)

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General Movie Shooting Cautions
Recording and Image Quality
z If you use a card with a slow writing speed, a five-level indicator
(1) may appear on the right of the screen during movie shooting.
It indicates how much data has not yet been written to the card
(remaining capacity of the internal buffer memory). The slower
the card, the faster the indicator will climb upward. If the indicator
becomes full, movie shooting will stop automatically.
If the card has a fast writing speed, the indicator will either not
appear or the level (if displayed) will hardly go upward. First, shoot
a few test movies to see if the card can write fast enough.
Playback and TV Connection
z If you connect the camera to a TV set ( = 305) and shoot a movie, the TV
set will not output any sound during the shooting. However, the sound will be
properly recorded.
Restrictions on MP4-format Movies
z Note that generally, the following restrictions apply to MP4-format movies.
- Sound will not be recorded for approx. the last two frames.
- When you play back movies on Windows, movie images and sound may
become slightly out of synchronization.
(1)