A professional video converter can help you.
I recommend 4Videosoft Video Converter Platinum.
http://www.topmediasoft.com/video-converter-platinum-4.html
It can convert between any video formats including MPG, MPEG, MPEG2, MP4, H.264, SWF, FLV, VOB, MOD, M4V, AVI, WMV, 3GP, 3GPP, MOV, DivX, XviD, QuickTime Video, DV, MJPG, MJPEG, MPV, etc, along with HD videos, like HD TS, HD MPG, HD MPEG, HD MP4, HD AVI, etc and extract audio from these video.
It also converts between all audio formats including MP3, MP2, AAC, AC3, WAV, WMA, M4A, RM, RAM, OGG, AU, AIF, AIFF, APE, FLAC, NUT with excellent conversion speed and quality.