I've experienced an issue with light flicker for a while. Every time I film where there is any kind of artificial light i end up with a flicker in the back ground. It was very frustrating especially since I traveled hundreds of miles and sometimes even thousands of miles to get the footage.
I started hunting for solutions but couldn't find any on the trusty youtube so i was stumped. I did however establish that the flicker was caused by an imbalance in frequency emitted by the light and the camera shutter speed. After playing around with it for a while longer i stumbled upon the solution. The video below shows you I achieved it. Very simple. Please watch and comment if it helped you.