FFmpeg is great software. It is unbelievably flexible and has a ton of functionality out of the box. It has a bit of a steep learning curve, but the user manual

FFmpeg is great software. It is unbelievably flexible and has a ton of functionality out of the box. It has a bit of a steep learning curve, but the user manual is quite comprehensive. I have used it for transcoding video/audio to HLS and it has worked very well.