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Quicktime not opening AVI files in Lion.

I just installed OS X Lion but when I try to open any AVI video with Quicktime that reads "The Document <filename> could not be opened. A required codec is not available." I clicked the "Tell Me More" button and I redownloaded the DIVX codec but my files still don't open with quicktime. Is it possible that my codec is not compatible with Quicktime for Lion? But then again the Quicktime application is still the same, it hasn't been updated since Snow Leopard. Is anyone else encountering this?

MacBook Pro, Mac OS X (10.7), 15" MacBook Pro, Intel Core i7

Posted on Jul 20, 2011 8:32 PM

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91 replies

Jul 25, 2011 4:59 AM in response to ilmaio

i just updated perian to 1.2.3. still no luck. qt x still doesn't play avis. i get the message:


You need QuickTime Player 7 to open “****.avi”.


with qt 7 the avi plays, but still, there were no problems like this with sl.


update: if i uncheck the "Load external subtitles" in perian's pref pane, qt X works. so as somebody mentioned before, it must be perian's problem with subtitles.

Jul 26, 2011 11:41 AM in response to DonAndino

I found an old xvid codec in the /library/quicktime/ folder; i deleted it and now quick time x opens avi file.

I still have the problem with subtitles, if i check "load external subtitle" then quick time tells me to open the file in quicktime7.

I guess the 1.2.3 upgrade of perian wasn't about that bug.

I still wait for another update and i use VLC in the meantime.

Quicktime not opening AVI files in Lion.

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