If you are recording under lighting that is produced by discharge tubes (such as fluorescent, sodium or mercury-vapor lamps), the screen may flicker, colors may vary, or horizontal stripes may appear distorted. In such cases, enable the anti-flicker feature on your camera so that it can handle the flickering of artificial lighting. The options are 50Hz, 60Hz and OFF.
The anti-flicker setting can be found under some specific exposure modes (AUTO, AAE and Bright):
- In the OSD menu (pressing the MENU button on your remote control): CAMERA > EXPOSURE > Flicker
- Or -when supported- from the camera web gui: VIDEO tab > Camera Settings > Exposure > Flicker
(Depending on lighting types, such occurrences may not be improved with the anti-flicker setting. It is recommended to set -into the Manual or SAE exposure mode- the shutter speed to 1/100s in areas of 50 Hz power supply frequency, and to 1/60s in areas of 60 Hz power supply frequency)
It can be also worth asking oneself on which output do we see that flickering: HDMI, IP?
(Situation can vary according to the frame rate. If IP look at : VIDEO > Video Encoder . If HDMI: VIDEO > Output Format)
Be aware that in the case of USB camera the anti flicker is a setting that can be controled over UVC and mostly this will be the application that will dictate what the camera should deliver, for instance: