You know,FFmpeg is a powerful video converter runs in command line,but not everyone like to convert video in command line,especially for those common user.now,I strongly recommend a powerful video converter - WinFF .
WinFF is a GUI for the command line video converter, FFmpeg , by taking advantage of FFmpeg,WinFF supports most of video formats ,eg: avi,mpeg,wmv,dvd,vcd,mov,psp...and so on, ooh,wait,WinFF is cross-platform software as well!!
Read more about WinFF:http://www.winff.org
Download WinFF new version 0.42: