Why do i get a "codec installation required" message?

Why do i get a "codec installation required" message when trying to play avi files? Im using QT7 on a mac, v10.6.7?, Why do i get a "codec installation required" message when trying to play avi files? Im using QT7 on a mac, v10.6.7?

Why do i get a "codec installation required" message when trying to play avi files?
Probably because you do not have an audio and/or video codec used for compressing/decompressing data in the AVI file. AVI, like MOV, are just file containers capable of holding many different kinds of data. The originator of the AVI file (Microsoft) dropped its official support of this file type more than a decade ago but its popularity with Windows users lingers on. Unfortunately, with few exceptions, the compression formats commonly used in the AVI file container may or may not still be in use. Some were never transcoded for use on the Mac platform. Others are so old that they have never been updated for use under OS X. Of thise transcoded for OS X use, some have not been updated for Intel based platforms. Thus, while QT supports the container itself, it does not natively support the third-party and/or proprietary codecs used, many of which, are now classed as "legacy" codecs and are out of date in terms of today's video compression technology.

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Why do i get a "codec installation required" message?

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