If your live view or hi-res video images have light bands that move across it, you are probably dealing with an issue between the refresh rate of your live view and the lighting source.

One potential source for this is your lights, especially if they are fluorescent. In that case, you may need different lights.

For most video sources, in the Camera Settings, you can select ‘Frame Averaging’ and choose a value like 60. This will average together many consecutive frames, and probably get rid of the banding effect.