no sound on 720p videos

[hail2theskins]

hi guys, i've been trying to play 720p videos on my transformer since i got it. At first they wouldn't play at all, but now with the updates i can play the videos, just no sound. I've downloaded rockplayer, mxplayer, moboplayer, all with current codecs, it's the same on any of them. I've read people say they can throw anything at these players, but the only things i can play is dvd quality. I'm trying to be able to play movies without converting, is this possible or no?