What type of video files does UE4 accept?

I read that it doesnt support .bik anymore, im not sure if thats still true so what type of movie files does it accept? I would like to import a video and place it as a movie texture but im not sure what file it supports if it doesnt support .bik anymore. Also, i’m not a programmer but if a programmer on my team has the entire source code for the engine could they create a way to import certain video files? like .mp4 or something?

Yes it uses mp4 but you need a entry level to use ithttps://docs.unrealengine.com/latest/INT/Engine/MediaFramework/index.html#mediaframeworkwithblueprints