No sound from Quicktime 7

Trying to watch .avi, shows perfectly - but no sound. i have tried going into applications/utilities/audio setup etc...but still doesn't work.
Can anyone help this novice mac user?

First, identify what type of audio encoding is used then look for a component to support it in QuickTime or use an alternative player.
To identify the file*, video and audio** format of a movie or sound file:
QuickTime Player:
Open the file
Window menu > Show movie info
Look in the Format: field
**Note that recently someone posted in the forum that QuickTime Player failed to display any audio information for a file which did play with audio (A52) in VLC.
MPlayer OSX:
Show the playlist window if it isn't already visible.
Drag the movie file into the playlist window.
Select the movie in the list
Click the "i" button for info
VLC:
Open the movie in VLC
Window menu > Info
Click the black triangles so that they point down
*Note that VLC does not display the file format, only the format of the content (audio and video) within the file. A file ending in .divx for instance, is probably in actuality an avi file but VLC doesn't show that information - MPlayer will and QuickTime Player will - if - QuickTime Player will open the file to begin with.
QuickTime components, newer info is further down...
http://discussions.apple.com/thread.jspa?threadID=323449&tstart=15
QuickTime Alternatives:
MPlayer OS X - Plays just about everything has built-in decompression for other formats such as Indeo Video 3 - FREE
http://mplayerhq.hu/homepage/design7/dload.html <--- "Mac OS X 10.3.9 or later" also works on Tiger
http://mplayerosx.sourceforge.net/ <---- NOTE: Version 2 requires Tiger. This version is buggy.
-- If QuickTime Player won't even open a file, try running MPlayer and showing the playlist window, drag the file into the playlist and click the "i"nfo button to see the file format, video and audio compression types.
VLC (VideoLAN Client, application, not a QuickTime Component) - FREE
http://www.videolan.org/vlc/download-macosx.html
"Latest Mac OS X package for 10.2, 10.3 and 10.4. Requires QuickTime 6.5.2 or later."
Microsoft Windows Media Player 9
http://www.microsoft.com/mac/downloads.aspx?pid=download&location=/mac/download/ misc/winmp_osx.xml&secid=80&ssid=8&flgnosysreq=True
"System requirements
Minimum system requirements for Windows Media Player:
Operating system: Apple Mac OS X version 10.1.5 (latest version 10.2.x recommended)
Any computer supported by Mac OS X version 10.1.5 (450 megahertz (MHz) PowerPC G3 processor or higher recommended)
Memory: 128 megabytes (MB) or higher
Free hard disk space: 10 MB
Monitor color depth: 256 colors (Millions of colors recommended)
Microsoft Internet Explorer 5.1 for Mac, America Online for Mac OS X, Netscape 7.1, MSN for Mac OS X version 2.0, or Apple Safari 1.0"
RealPlayer (the only way to play some of the Real encoding types in OS X) - FREE
http://www.real.com/
"Minimum System Requirements
- Mac OS X 10.2 (with Safari installed) or later (10.3 or later recommended)
- 256 MB RAM (512 MB recommended)
- G3, G4, Mac OS X compatible
- Internet Connection"
NicePlayer & the XinePlayer plug-in - All the features of QuickTime and the additional support of Xine for non-QuickTime compatible movies such as mpeg2.
http://niceplayer.indyjt.com/ <-- for Mac OS X 10.3.9 or higher
<a class="jive-link-external-small" href="http://">http://osiris.laya.com/projects/niceplayer/ <-- for Mac OS X 10.4 or higher, this is the XinePlayer plug-in link

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No sound from Quicktime 7

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