video
.avi (pc)
.ram (pc)
mpeg (mpg)cross platform
mpeg4
mpeg4 scales to any bandwidth dvd quality, better compression ready to stream, focused on streaming video over wide variety of devices
.qt alternate quicktime
mpeg2
.mov quicktime native MAc



mpeg2 dvd quality

audio
mp3 both
.aiff mac
.au most common file (mac and unix)
.wma microsoft competitor to mp3
.wav windows (sound application to play on Mac)
.ra (.ram) both real audio player


audacity program for audio


riping from dvd dvdshrink