Canon EOS 7D Mark II Advanced Owners Manual - Page 352

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. Indicator 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. If the indicator indicates that the card is full and movie shooting stops automatically, the sound near the end of the movie may not be recorded properly. If the card's writing speed decreases (due to fragmentation) and the indicator appears, formatting the CF card (p.67) or low-level formatting of the SD card (p.67-68) may resolve the problem. Still Photo Shooting during Movie Shooting Regarding the image quality of still photos, see "Image Quality" on page 310. 352