No sound in videos problem!

Ever since I updated my desktop Mac with Mavericks I have been having ongoing issues with movies I have on my Mac.
They were originally downloaded as (.avi) format however with the new Mavericks these videos go through a conversion process turning them
into (.mov) videos. My issue is that now these videos dont play sound!
Is there any way I can solve this problem?
Also, due to the update of Mavericks I have found Perian to be of no help either.
I am using Quicktime Player 10.3
Thanks!

Thanks for that it has helped having me to convert each and every video I decide to watch. However, some videos are still playing without sound... Is there any way to fix this?
I recently downloaded a TV series and it happens to be these videos (.avi) that dont play sound whereas actual movies (.avi) I have stored on my Mac do play with sound.
It depends on what you mean by "fix" and what kind of audio data is stored in the AVI container.
Normally, the easiest way to play AVI files is to use the free VLC player which contains its own support codecs. This approach will usually play the files correctly but means they remain incompatible with the Mavericks QT embedded structures. Another approach is to make the files compatible with the structure(s) which are embedded in the Mavericks OS—i.e., either convert the AVI files to MPEG-4 AVC or Apple ProRes video files with a supported audio compression format or add codec support so that the files can be played in the QT 7 player depending on how you wish to "fix" file compatibility with QT.
If the files can be played in VLC but you still choose to convert the files for QT X, QT 7, mobile device, TV, and/or QL compatibility under Mavericks, then the best approach would usually be to use the free HandBrake app which uses the same codec support plackage as the VLC player. While this approach can cause a degredation in video quality (depending on settings used), it does provide the widest range of QT compatibility for the resulting files using the widest potential range of user options.

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Moderator Note; edited thread subject line for clarity
Message Edited by andyP on 01-05-2009 09:13 PM

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iMovie does not work with muxed MPEG-1 and MPEG-2 clips
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Do you get an "HDCP error"?
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i downloaded a few videos and they played fine on
itunes. BUT, they couldnt be added to my ipod. i
followed instructions to convert them for my ipod but
the converted videos dont have any sound. when i put
the converted videos on my ipod, they wont play- they
show up like a song- white background, name of song
and band, and, instead of the album cover, there is a
still frame from the video. is there something wrong
with the videos??? help!!!!
That sometimes happend to me when I converted the videos using Itunes....So, I use this converter instead...
Videora Ipod Coverter
http://www.videora.com/en-us/Converter/iPod/
It'a a free program to download and your videos should play fine in your ipod once you use this to covert them.
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If you need anymore help, just let me know, I know how annoying it is when the videos won't play properly!!!
Good luck with it!
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