Canon EOS RP Mirrorless Camera - Manual (Page 253)

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Setting the Movie Recording Size
Cards that Can Record Movies
For details on cards you can use for various movie recording sizes, see
= 585.
When recording movies, use a high-capacity card with a writing/reading
speed (as specified in card performance requirements) shown in the
table on = 585 or higher than the standard specification. Test cards by
recording a few movies to make sure they can record correctly at your
specified size ( = 249).
o Format cards before recording 4K movies ( = 367).
o If you use a slow-writing card when recording movies, the movie may not be
recorded properly. Also, if you play back a movie on a card with a slow reading
speed, the movie may not be played back properly.
o When recording movies, use high-performance cards with a writing speed
sufficiently higher than the bit rate.
o When movies cannot be recorded normally, format the card and try again.
If formatting the card does not resolve the problem, refer to the card
manufacturer’s website, etc.
o To obtain better performance with the card, formatting the card with the
camera before recording movies is recommended ( = 367).
o To check the card’s writing/reading speed, refer to the card manufacturer’s
website, etc.