Canon POWERSHOT SD400 DIGITAL ELPH User Manual page 122

', Movies recorded with high resolutions and frame rates may
momentarily stop playing if played on slow reading SD cards.
,, Movies recorded at the _ Fast Frame Rate setting and with the
video signal set to the PAL format, may play back with a frame rate
lower than the recorded one when output to a TV or video. You can
play every frame by using the slow motion playback. To check the
images at the original frame rate, you are recommended to play the
movie back on the camera's LCD monitor or on a computer.
,_ You may experience frame dropping and audio breakup when
playing back a movie on a computer with insufficient system
resources.
,, Movies shot with other cameras may not play back on this camera.
See List of Messages (p. 162).
,_ You can adjust the playback volume of movie clips in the _ (Set
up) menu.
,, Use the television's controls to adjust the volume when playing a
movie on a TV set (p. 155).
,, The audio cannot be played in slow motion playback.
120