Can anyone point me in the right direction to convert mp4 videos to an avi format? I'm looking for something free that's not going to impregnate my laptop with anything other than exactly what I'm looking for. I'm getting my feet wet in astrophotography and I'm unfamiliar with this conversion. I know I can pay for plenty of reputable software but I spend most of my money on grain, honey, fruit, equipment, etc, etc....