In short, something that just does what one would expect such a program to do. (Just convert it so it works on my mother's media player!)
- By "free" I mean free-as-in-beer. I'm okay with closed source as well as ad-supported programs.
- By "lightweight" I mean a program designed to convert, not a full-fledged editor like Audacity.
- By "all-in-one" I mean a program that can convert to and from most common formats like MP3, M4A, WAV, FLAC, automatically introspecting containers like AVI and detecting codecs.
For Windows 7+.