Avi files in quicklook have no audio

Most of the videos on my computer are mp4 or m4v files, but I have a few which are avi. They play fine in VLC, but not in quicktime or quicklook. The video is fine, but there's no audio.
How do I fix this?
Also is it related to the fact that avi files often come up as an icon in quicklook when my folder is viewed as columns, but plays (the video without audio) when it's in cover flow? This doesn't happen everytime, but often...

you probably are missing necessary plugins to play those avis in Quicktime player. try installing Flip4mac
http://www.apple.com/downloads/macosx/video/flip4macwindowsmediacomponentsforqui cktime.html
and/or Perian
http://www.perian.org/

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Here's the error screenshot: http://i16.tinypic.com/6z3ubkp.png
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Here try this component for Quicktime to open avi's, Perian.
http://perian.org/#download
You need at least OSX.4.7
You should remove the DivX component. Read from the site what other components you need to remove.

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What is a CODEC... a Primer http://forums.adobe.com/thread/546811?tstart=0
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037?tstart=0
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http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-problems-in-Windows-Media-Player
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Media Feature Pack for Windows 7 N and Windows 7 KN (KB968211)
http://www.microsoft.com/downloads/details.aspx?FamilyID=31017ed3-166a-4c75-b90c-a6cef9b414c4&displaylang=en
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http://support.microsoft.com/kb/316992
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http://www.free-codecs.com/download/K_Lite_Codec_Pack.htm
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T.

QT does not open AVI file

hello,
I have installed Perian but with Mountain Lion QT does not open AVI file (no audio and no video)
do you have any suggestion?

I am using QT pre-installed in Mountain (should be X)
QT X can only play files using codecs it is programmed to expect to be used in the loaded file container/with the loaded file's stated extension. For example, QT X will not play a "muxed" MPEG-2/AC3 file with an MOV or VOB file extension but will usually play the file if the extension is changed to TS, MPG, or MPEG. On the other hand, the QT 7 Player tends to look at the internal header information and select a codec based on what the file says it needs for the actual playback. Thus, the QT 7 Player may frequently play files that the QT X Player does not play.
Besides supporting the the AVI file container, your QT system must also be configured to support the actual audio and video codecs contained in the AVI file and not have a "conflict" problem. For instance, Motion JPEG support for QT was dropped with the release of Lion. AVI files containing MJPEG video thay plays correctly under Snow Leopard will no longer play under Lion or Mountain Lion with additional support. In this case, Perian still provides such support. It also still provides support for DIVX, XVID, 3IVX, and similar third-party codecs commonly found in AVI containers. However, Perian support for such files can become conflicted if you have also installed the actual third-party codecs along with Perian and the different codecs fight over which is to be used for playback. This is why it is important to know the actual codecs used to create files using generic file containers like AVI and MOV and the codec components actually installed on your system, as well as, their potential for creating conflicts.
As to the actual playback of files, there are basically only three options (as indicated by the URL provided above:
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2) You can use an alternative media player app the contains "native" support for the file containera and/or codecs used to create the files, or
3) You can convert the file to a compression format and file container that that is already natively supported by QT-based applications.
Since do not seem to know or are unwilling to identify the specific codecs causing a problem here, the only workflows left to you would be to try playing the file in an alternative media player which contains its own built-in codec support (e.g., VLC) or convert the files to something your current QT system configuration can handle (e.g., use a converter with built-in codec support like HandBrake).

How to open AVI files?

I have six AVI files that I very much need to see.   They come on a CD-ROM. I have transferred them to my hard drive.   They do not work from either the CD-ROM or the hard drive.
GetInfo identifies these videos as “AVI movie.”
The closest I can get is with Real Player, Version 12.0.1 (1750). This application opens a window for each file. The thermometer across the bottom of the window moves as if the application is playing the video, but the window remains totally black.   (The videos should not have any sound, so I do not expect to hear anything from them.)
I have no luck at all with VLC and QuickTime Player. VLC, Version 2.0.7 Twoflower (Intel 64bit), reports:
QuickTime Player, Version 10.0 (131), reports:
I get this problem with videos from people who do not use Macinstoshes.
Does anyone know how to open such AVI files?

I have Perian 1.2.3. Its update function reports that is the latest version.
Perian's GetInfo has the following report, which says nothing about the T263 codec:
About
Perian aims to provide a single package for all your playback needs. It is a collection of QuickTime components incorporating several libraries:
• libavcodec, from the ffmpeg project, along with code from the old FFusion component:
          • MS-MPEG4 v1 & v2
          • DivX
          • 3ivx
          • H.264
          • Flash Video
          • Flash Screen Video
          • On2 VP3, VP6, VP8
          • H263I
          • HuffYUV and ffvhuff
          • Indeo 2, 3 & 5
          • MPEG-1, 2 & 4 Video (in supported formats)
          • Fraps (up to v4)
          • Windows Media Audio v1 & v2
          • Flash ADPCM
          • Xiph Vorbis (in Matroska)
          • MPEG Layer I and II audio
          • DTS Coherent Acoustics audio
          • Snow wavelet video
          • DosBox video
          • Nellymoser ASAO audio
• libavformat, from the ffmpeg project. along with AVIImporter.component:
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          • FLV file format
          • NUV file format
• libmatroska, along with matroska-qt.component:
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• Subtitles:
          • (Advanced) SubStation Alpha
          • SRT
          • SAMI
          • VobSub
• liba52, via A52Codec:
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The code is available under the LGPL. The development site is located at <http://trac.perian.org/> and the project's Subversion repository is located at <http://svn.perian.org/>.
The code for A52Codec is available under the GPL. The project site is located at <http://trac.cod3r.com/a52codec/> and the project Subversion repository is located at <http://svn.cod3r.com/a52codec/>.

Avi files in quicklook have no audio

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