Nikon 1 J5 Reference Manual page 79

A
Frame Rate and Playback Length
The frame rate for slow-motion movies can be selected using the Slow
motion option in the & menu; the faster the frame rate, the smaller the
frame size.
Frame size
Option
(pixels)
1280 × 720 12 Mbps
120 fps
800 × 296
400 fps
1200 fps 400 × 144
1 All figures are approximate.
2 Slow-motion movies will play back over a period of about 4 (120 fps), 13
(400 fps), or 40 (1200 fps) times the recording time.
Maximum length
1
Bit rate
(shooting)
3 Mbps 3 seconds
1 Mbps
Maximum length
1
(playback)
12 seconds
40 seconds
120 seconds
1, 2
y
57