MPEG2 is the only supported format. Others need to be converted or transcoded. Video (as well as music and pictures) from Macs will work with either EyeConnect or Twonky. EyeConnect will directly stream videos recorded using EyeTV. I have both of these on my G4 PPC Mini. Both have a 30-day trial period before you have to register, but EyeConnect will stream audio only beyond that period without registering. Getting the audio track of a video to work can be an issue at times.