Canon EOS 80D - Manual (Page 215)

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General Movie Shooting Cautions
Recording and Image Quality
 If you use a card with a slow writing speed, a five-level
indicator 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
 If you connect the camera to a TV set and shoot a movie, the TV set will
not output any sound during the shooting. However, the sound will be
properly recorded.
Indicator
Restrictions on MP4-format Movies
Note that generally the following restrictions apply to MP4-format movies.
 Sound will not be recorded on approx. the last two frames.
 When you play back movies on Windows, images and sound may
become slightly out of synchronization.