I have an AVI file that is not playing in QuickTime player.
The error message says 'A required codec isn't avalible'. Why is that?
Because there isn't a codec installed for that specific AVI; as AVI is a container, not a format, it's impossible to be certain, but it's most likely either part of Perian or doesn't exist for Mac OS X.
Can you recommend a converter or something I can install that will work for AVI?
Thanks in advance!
Try installing Perian.
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