This function is awesome, i also found the way to put a encoder on it but it have a issue that i need to solve.  Basicly when i try to encode with audio on unreal its everything ok, but doing it at runetime the audio dosent works, it encodes de jpgs right, and make it a mp4, but i cant finde the way to make this with audio. Any help would be apreciate, thanks.

Does this help? How to get audio rendered alongside video using sequencer? - Development / Rendering - Epic Developer Community Forums (unrealengine.com)

You need to do something to tell the movie render subsystem to also output audio, either in the mp4 or as a separated output. I am not sure if this is possible or how to do it, it has been a while.