Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 251)

Movie Recording
For movie recording, set the Live View shooting/Movie shooting switch to < >.
Caution
When switching from still photo shooting to movie recording, check the camera
settings again before recording movies.
• Tab Menus: Movie Recording
• Movie Recording
• Movie Recording Quality
• Sound Recording
• Time Code
• Canon Log Settings
• Movie Digital IS
• Other Menu Functions
• General Movie Recording Precautions
251