- Which setting should I use?
- Lights fixes the usual case: footage shot under LED, fluorescent, stage or rink lights, where the flicker repeats every few frames, at 24 to 120 fps. Choose Strong for slow motion, old film, or when thin bands are still visible after Lights. Choose Timelapse when whole frames jump in brightness between shots.
- What kinds of flicker does it remove?
- Three kinds. The whole image getting brighter and darker every few frames. Dark or coloured bands that roll through the picture under LED or fluorescent light. And lamps, signs or screens that pulse in one part of the frame while the rest holds still. The Lights setting handles all three; Timelapse is for exposure jumps between the photos of a timelapse.
- My video keeps getting brighter and darker. Can this fix it?
- Yes. When the whole picture jumps in brightness every few frames, because a light drops out or flares or the camera's exposure and white balance hunt, Lights and Strong bring every frame to the brightness and colour the shot has otherwise, then take out the flicker that is left. Fades, a light being switched on and cuts are kept. Frames that went fully white or black can only be brought part of the way, because their detail is gone.
- Can it fix rolling bands from LED lights?
- Yes. On footage at 30 or 60 fps the bands are measured in every frame and divided out, so nothing is borrowed from neighbouring frames and moving things do not ghost. At other frame rates each area is evened out against the frames around it, and thin, sharp bands that race through the frame can stay faintly visible. Filming at a shutter speed of 1/50 s (1/60 s where mains power is 60 Hz) avoids them.
- Will it remove cuts, fades or lightning?
- Cuts, fades and smooth camera moves pass through, because each area is only compared with a few neighbouring frames and a steady change is not flicker. A flash that lasts a single frame, such as lightning or a camera flash, looks like flicker and is evened out.
- Do I have to install anything?
- No. It works in the browser on a phone, tablet or computer: upload the clip, process it, download the result. The work is done on our servers, so a long clip does not slow your device down.
- Is the video deflicker free? Do I need an account?
- Processing and the preview are free, and the result carries no watermark. The clip is processed on our servers, so you need a free account to run it. Downloading is free on any plan; free accounts get 2 downloads a day for clips up to 30 seconds.
