handbrake

Hope I have this in the right place. I've been working on a project and have run into a problem. I've encoded some files with Handbrake which output them as .m4v files. Is this a common file type that most devices will be able to play? I've loaded these onto a flash drive as a surprise gift, but...

I've been setting up some videos to compress in a queue using Handbrake and it's all fine, but for certain reasons I'd like to be able to limit the process to specific threads. Now I know I can go through the task manager and right-click on the process to Set Affinity (which I've been doing so...