Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 329)

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3 Setting the Time Code
If the frame rate is set to 2 (119.9 fps), 8 (59.94 fps), or 6 (29.97
fps), the time code’s frame count causes a discrepancy between the
actual time and time code. When [
Enable ] is set, this discrepancy is
corrected automatically. This correction function is called “drop frame.”
This is for advanced users editing movies.
Enable : The discrepancy is corrected automatically by skipping time
code numbers (DF: Drop frame).
Disable : The discrepancy is not corrected (NDF: Non-drop frame).
The time code will be displayed as follows:
Enable (DF)
: 00:00:00. (Playback time: 00:00:00.00)
Disable (NDF) : 00:00:00: (Playback time: 00:00:00:00)
Drop Frame
If the frame rate is 3 (100.0 fps), 7 (50.00 fps), 5 (25.00 fps),
B (24.00 fps), or 4 (23.98 fps), the drop frame will not work. (If 3 /
7 / 5 / B / 4 is set or if [ 5 3: Video system ] is set to [ For PAL ],
[ Drop frame ] will not be displayed.)