no audio with Quicktime video streams

[Clint Harshaw <clint@xxxxxxxxxxxxxxxxxxxx>]

Can anyone get any audio to accompany the streaming Quicktime video at 
http://www.apple.com/trailers? I have never been able to get either FC1 
or FC2 set up to properly play those video streams.

I have installed mplayer* via yum.

The video comes through just fine. There is no sound, however.

I know that it *can* be done on a Linux machine, because I saw the 
trailers with audio playing just fine on my friend's Mandrake 10 box 
that had mplayer, mplayer-gui, and mplayerplugin installed with urpmi.

Now there *are* some video files that play just fine with the audio in 
my Mozilla browser, for example:

http://www.ntk.net/media/dancemonkeyboy.mpg
http://www.flamingmailbox.com/maccomedy/movies/wincrash.html

So I have the problem narrowed to those in-browser videos that are 
Quicktime streams.

I want to learn how to get my Fedora machines to play them as well as 
the Mandrake machine could!

Thanks,
Clint