You can try iskysoft Video Converter for Mac ,which can convert video formats from one to another with perfect output quality and high conversion speed for Mac OS X users. It supports all popular video formats including MP4, AVI, WMV, MPG, MPEG, MOV, TS, FLV, etc. and HD video like AVCHD(MTS/M2TS), AVCHD lite, MOD/TOD, HD WMV, HD TS, etc.
This versatile Mac video converter also provides the function of converting video to audio, audio to audio. The supported audio formats are MP3, MP2, MKA, M4A, AAC, AC3, APE, OGG, etc.
Free download link: http://iskysoft-dvd-ripper-pack-for-mac.kooksoft.com/video-converter-for-mac.html
Step to step guide: http://iskysoft-dvd-ripper-pack-for-mac.kooksoft.com/How-to-convert-all-video-files-and-extract-audio-from-video-on-Mac-OS-X.html
Hope can help you :)