FFmpeg is Super -- blazingly fast. But you many need a front end GUI if you're not a tech-head. One guy said "work it from the command line." This technique is as user-friendly to lay folks as "noncommutative algebraic geometry." It's also like saying one prefers an abacus over a calculator. Anyway, I got my front-end as a Firefox browser addon and it is GREAT with simple drag 'n' drop and settings. Links aren't allowed here, but go to Firefox Addons and search for ... "Media Converter and Muxer". Be sure to read the page because you have to get ffmpeg.exe and the page tells you how. Without this addon, I rate FFmpeg Ease-of-Use as (1) Poor (or even impossible). But with the front-end Firefox MUXER addon, I rate Ease as (5) Excellent.
No builds, exes, dlls etc.
There are no 4 star reviews.