There is no single codec for movies that have.avi extensions. AVI is a container format, not a specific type of file. An AVI movie may use one of the Indeo codecs (there are at least four that I'm aware of, none of which have been ported to Mac OS X) or one of the various flavors of DivX, among other possibilities. You'll have to find out what codec was used for the movies you want to view to determine what you need.

Note that not all codecs for the various.avi movies are available for QuickTime. If you want to try 'hit and miss',, which rolls several codecs into one package, might work. If not, you can try the codecs at and and see if one of them will work for you. Do not install both Perian and the DiVX/3iVX codecs at the same time.

If you just want to play the movie any way you can, you can also give this player a try: Regards. My QuickTime player us not playing.avi files and says I need a codec I can't play no.avi files on QuickTime. How could I fix this because I want to play these files with QuickTime. AVI refers to the file container and the fact that the audio and video frames of data are interleaved.

It does not refer to an specific audio and/or video compression formats. This file format has not been officially supported by Microsoft for more than a decade but Windows users continue to use it is open, easy to use, and in some cases, the users are simply too lazy to update to a more modern file container and/or compression formats. As to the codecs, some have never been transcoded for use on the PowerPC Mac.

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Others have not been recoded for use on Intel based Mac platforms. And currently many are simply not supported by the QT X Player app. In most cases, you can install the QT 7 Player along with the Perian component package which contains codecs that support most of the current AVI compression formats which are Mac supported or you can examine the AVI files to learn what specific codecs are required for viewing and install them if available or lastly, use an alternative player like VLC. Report back when you're sure 😕 If you read the post above by KPHINC in this thread he had no luck w/Perian. MPEG Streamclip might do it but doesn't seem to have the control that iSkysoft Video Converter has. Before I bought it I used it to on a few movies and wrote to the developers. With good support and being able to customize the movie being converted, I decided to purchase it.

I don't mind supporting developers making good apps for Mac. (I have MPEG Streamclip and if there is a purchasable version, that's what I own.). Report back when you're sure 😕 Unreasonable request. Since AVI can contain dozens of codecs in hundreds of combinations it impossible to reconstruct each scenario which would be required in order to present a solution where people just say they have an 'AVI that doesn't play'. If you read the post above by KPHINC in this thread he had no luck w/Perian. Yes, and came up with the highly unlikely solution of changing the extension to.mov While nice s/he came across it I think it won't work in 99% of the situations. In that case it may have just been the file was mis-labeled, or had Quicktime compatible codecs already but QT didn't realize it could play them (I have done that rarely by renaming compressed.wav to.mp3).

Using a codec tool such as MediaInfo helps in deciphering that. Comes with a Utility MPEG2 Component ML app with no explanation of what it's for?

The utility app is an 'assistant PKG installer.' It allows Lion and Mountain Lion users to install the older QT MPEG-2 Playback Component installer PKG file which is not allowed to run on its own under Lion or Mountain Lion since these operating systems already have a QT X only MPEG-2 component embedded in the QT embedded structure. Without this utility you would have to either copy the component from an older system to your Lion or Mountain Lion system, use Pacifist for installation, or manually open the PKG contents and transfer the component to the appropriate component folder. As to your 'discussion' regarding the playback of AVI file types, there are really only two strategies here: 1) You can add component support so that QT can play the files natively or 2) You can convert the file contents to compression formats that are natively compatible with the unmodified QT component configuration. Each user should decide for his or her own self which approach best suits their needs for a particular source file. In most cases, conforming the system's codec component configuration to play the source file directly results in higher video quality since no transcoding takes place but this strategy will not work if a codec which is required is not available for the user's operating system. On the other hand, converter utilities tend to support more built-in codecs and are easier to use since the user does not have to concern him or herself with the nature of the particular source compression formats but at the risk of some potential loss in visual quality.