Webcam Anti Flicker: 50Hz vs 60Hz Settings

Why lights flicker in video

Artificial lighting powered by the AC grid does not shine at a constant level. The current driving the lamp alternates direction many times per second, so the light intensity pulses up and down at a rate tied to the power line frequency. Your eyes perceive this as steady light because the pulse is fast, but a camera sensor can catch the bright and dim moments separately.

The result appears as horizontal bands that drift slowly across the frame, sometimes called banding or rolling bars. The cause is a mismatch between the camera's exposure timing and the light's cycle. When the sensor reads the scene one row at a time, rows captured during the bright part of the cycle look different from rows captured during the dim part. The shorter your exposure time, the more obvious the difference becomes.

What anti flicker mode does

Anti flicker mode locks the exposure time to whole multiples of the light's flicker period. Each frame then integrates the same number of bright and dim cycles, so the brightness stays even from frame to frame and the bands disappear. The setting is usually presented as a choice of power line frequencies rather than as an abstract calculation.

The work happens inside the camera's image engine. Webcam makers commonly list flicker compensation among the processing steps their image processors perform, alongside white balance, noise reduction and color correction. Some webcams give you manual control of shutter speed and ISO as well, which lets you handle tricky lighting beyond what the automatic mode does.

50Hz or 60Hz: which setting to pick

Match the setting to the AC mains frequency of the region you are in. The two options cover almost the whole world: 50Hz is used in most of Europe, most of Asia, Australia and large parts of Africa and South America; 60Hz is used in North America, parts of South America and several countries in East Asia. A few regions, such as Japan, use both frequencies in different areas.

Because the light pulses twice per electrical cycle, the flicker rate is double the line frequency. The camera setting is named after the mains frequency, not the flicker rate, so a 50Hz setting handles lights that pulse at 100 times per second and a 60Hz setting handles lights that pulse at 120 times per second.

If you travel with your webcam or move to a different region, change the setting to the local grid. Keeping the old setting can reintroduce bands even if the camera worked perfectly before.

When to switch anti flicker mode

The clearest sign that the setting is wrong is a set of horizontal bands or rolling stripes in the picture, especially under fluorescent or LED lighting. Switch the setting to the other frequency and watch the preview. If the bands disappear or stop moving, you have the right option.

Not all banding comes from the mains. Dimmer switches and inexpensive LED drivers can pulse their own light at unrelated rates, and no anti flicker setting will fully remove those bands. In a workplace, certified peripherals such as Microsoft Teams Rooms certified cameras are validated against higher performance targets and quality metrics for audio and video, which helps avoid these surprises in a meeting room.

Anti flicker can also constrain your exposure choices. Because the exposure time must be a multiple of the flicker period, very short exposures are off the table in artificial light. If you stream at 60fps or shoot fast movement, you may need to accept a slightly longer exposure and count on the anti flicker setting to keep the image clean.

If your webcam has no anti flicker setting

Most USB webcams follow the USB Video Class (UVC) standard, which means they work with a system-supplied driver on Windows without any proprietary software. The driver queries the hardware directly to learn its capabilities, so the controls that exist on the device are normally reachable from the maker's camera app or from the OS camera settings.

If your webcam lacks an explicit anti flicker control, try setting a frame rate that divides evenly into the local flicker rate. For example, 30fps is a common choice because it aligns with 60Hz regions, and in 50Hz regions 25fps is often used. This works only for frame rates, not for extremely short exposures.

When banding persists and your webcam offers no manual exposure control, the practical fix is to change the lighting to a source with a higher flicker frequency, such as a modern LED lamp that uses a constant-current driver. If you still need a camera that handles this cleanly, look for models that explicitly list flicker compensation in their feature set, as several of the best 4K webcams and best 1080p webcams do.

What to pick for your use

Questions

What does anti flicker mode on a webcam do?

It aligns the camera's exposure time with the power line frequency of your AC mains, so the sensor captures the same amount of light from each flicker cycle. This removes horizontal bands or rolling stripes caused by fluorescent and LED lighting.

Should I use 50Hz or 60Hz anti flicker?

Pick the frequency of your local power grid. Most of Europe, Asia, Australia and parts of Africa use 50Hz; North America and parts of South America and East Asia use 60Hz. When in doubt, check your region's mains standard.

Why do I see bands in my webcam video even with anti flicker on?

The setting may be wrong for your lighting, or the lighting itself may flicker at a frequency unrelated to the mains, such as with dimmers or inexpensive LED drivers. Try the other setting, and if the bands remain, change the lighting.

Does anti flicker reduce brightness or frame rate?

Anti flicker restricts the exposure time to multiples of the flicker period, so you cannot use very short exposures. It does not change your selected frame rate directly, but a very short exposure may not be available in artificial light.