Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 371)

371
k Playing Back Movies
Full HD movies shot at a high frame rate (119.9 fps or 100.0 fps) will be
played back at 1/4-speed slow motion (29.97 fps or 25.00 fps). No
sound will be played because no sound is recorded when shooting High
Frame Rate movies. Note that each second of playback time and the
time code count up equals to 1/4 sec. in real time.
Playing High Frame Rate Movies
If you connect the camera to a TV set to play back a movie (p.379),
adjust the sound volume with the TV set. (Turning the <
6 > dial will not
change the sound volume.) If there is audio feedback, place the camera
farther away from the TV set or turn down the TV sound volume.
If you detach or attach the lens, the card’s writing speed is slow, or the
movie file contains corrupted frames during movie playback, the movie
playback will stop.
With a fully-charged Battery Pack LP-E19, the continuous playback time
at room temperature (23°C/73°F) will be approx. 4 hr. 30 min. (with
L
6 / 5 / B / 4X set).
By connecting commercially-available headphones equipped with a 3.5
mm diameter stereo mini plug to the camera’s headphone terminal
(p.28), you can listen to the movie sound (p.324).