Quick answer: Test in the built-in camera app, change anti-flicker or power-line frequency, improve lighting, and connect directly without a hub.
Webcam flicker can result from LED lighting frequency, exposure settings, a weak USB connection, low power, or video-call effects. Work through one test at a time so the result identifies the layer that is failing.
Why this happens
The best clue is the boundary of the problem: one file or every file, one device or several, one network or every network. Note when it began and any update, hardware change, permission prompt, or account alert that happened just before it.
- Room lighting pulses at 50 or 60 Hz while camera exposure uses a conflicting rate.
- Auto exposure hunts in a dim or backlit room.
- A hub, long cable, or busy USB bus drops frames.
- Virtual backgrounds, noise removal, or an old driver overloads the system.
Fix it in the safest order
- Test the camera in the operating system’s camera app to separate the meeting service.
- Face a steady light source and turn off a dimmed or failing LED lamp.
- Set anti-flicker or power-line frequency to the local 50/60 Hz value if the camera exposes it.
- Connect the webcam directly, close other camera apps, and disable effects.
- Install the exact official webcam, chipset, and graphics updates.
Repeat the same small test after each change. Keep a note of the original setting so you can restore it if the change does not help.
How to confirm the fix
The preview and a ten-minute test call should remain stable at normal brightness without horizontal bands.
Common mistakes to avoid
- Do not install generic webcam driver packs.
- Do not point a bright lamp directly into the lens.
- Do not buy a new camera before testing lighting and USB power.
FAQ
Why does flicker appear only indoors?
Artificial lighting can pulse with mains frequency while daylight is continuous, making exposure-frequency mismatch visible indoors.
Should I reset or reinstall everything?
No. A factory reset destroys useful evidence and is rarely the first step. Back up important data, test a second file, account, network, or device, and use the narrowest reset that matches the confirmed cause.
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