Nikon D3400 Reference Manual - English - Page 164

A Maximum Length The maximum length for individual movie files is 4 GB (for maximum recording times, see page 141); note that depending on memory card write speed, shooting may end before this length is reached (0 269). D Recording Movies Flicker, banding, or distortion may be visible in the monitor and in the final movie under fluorescent, mercury vapor, or sodium lamps or with subjects that are in motion, particularly if the camera is panned horizontally or an object moves horizontally at high speed through frame (for information on reducing flicker and banding, see Flicker reduction; 0 213). Jagged edges, color fringing, moire, and bright spots may also appear. Bright regions or bands may appear in some areas of the frame with flashing signs and other intermittent light sources or if the subject is briefly illuminated by a strobe or other bright, momentary light source. Avoid pointing the camera at the sun or other strong light sources. Failure to observe this precaution could result in damage to the camera's internal circuitry. The camera can record both video and sound; do not cover the microphone during recording. Note that the built-in microphone may record lens noise during autofocus and vibration reduction. Flash lighting can not be used during movie recording. Matrix metering is used regardless of the metering method selected. Shutter speed and ISO sensitivity are adjusted automatically unless On is selected for Manual movie settings (0 142) and the camera is in mode M. 140 Recording and Viewing Movies