For the past few months I've been ripping music videos from my "store bought" DVD's to my video ipod & have had no problems until now. The DVD is "The Best Of The Moody Blues, 20th Century Masters - The DVD Collection (The 5 video DVD). The ripping process goes through smoothly but when I play the ripped video the picture is fine but the audio is white noise. How do I get the music tracks? Thank you.