VLC is known as a free media player, but it also comes with many hiding features, one of which is file format conversion. It can free change MP4 video to MPEG-2 format, as well as MOV, AVI, WebM, FLV, OGG, MP3, FLAC, etc. 15 video/audio formats on Mac and Windows. However, you should note that using VLC cannot promise there is no quality loss. And any conversion process will take roughly the same length as the content you are converting.