HandBrake is an open source and free video converter. You can input a wide range of video formats with various codecs, but it only encodes videos in MOV and MP4 containers. So you are only allowed to convert MOV to MPEG2 and MPEG4 in an MP4 format container. But this method is not recommended if you are using an old operating system, because the latest HandBrake stops running on Windows 7.