Flickering or shimmering is often a result of a lack of synchronization between the shutter speed/frame rate of the camera and the frequency of the AC power that the lights are plugged in to. This is known as the strobe effect. To prevent shimmering, the video frequency should synchronise with the frequency of the electric current. There are a few easy options to go about this.
Stop flickering video on iPhone by changing to a lower frame rate
The first solution is to use a shutter speed/frame rate that is slower than the frequency of the AC power. For example, in countries like the United States, Canada, and Mexico, the AC mains power runs at 60 cycles per second, so try shooting at frame rate that is lower than that but that syncs with 60Hz. For example, try 30 fps (frames per second).
If you are unable to do this in the default camera of your iPhone, download and install a 3rd party camera app, like Moment or Filmic Pro. These apps give you more control over frame rates and shutter speed.
Fix flickering video on iPhone by changing the shutter speed to match your country’s power mains
If you are not in the US, Canada, Mexico, or any other country using 60Hz current, your country’s mains power likely runs at 50Hz. Simply use shutter speeds of 1/25, 1/50, 1/100 or any factor of 50. These synchronise well with 50Hz current and eliminate the flickering.
Stop flickering video on iPhone by shooting or recording in PAL format
If you are located outside of North America where your mains current is 50Hz, another way to eliminate the flickering of video on iPhone is to do your video recording in PAL (Phase Alternating Line) format, which is widely used in most of the rest of the world. PAL shoots videos at 25 fps, which should eliminate the flickering when recording video with your iPhone. To change the video recording format to PAL on your iPhone, open Settings, go to Camera, and select Record Video. From the options listed, select any with PAL in it. One option allows you to shoot in pAL format at 1080p quality, and another at 4K quality. Both record at 25 fps. Select one and you are ready to start shooting your flicker-free videos. These are the three ways to get rid of the flickering you see when recording a video with your Apple iPhone. Happy recording.
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