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Here’s an open source quicktime AC3 codec for those of you running a mac and not able to play those XVID and DIVX movies you’ve been downloading with the ac3 codec:
http://sourceforge.net/projects/qtac3codec/
Ac3 is a typical codec for DVDs to have and AVIs to have, but for some reason quicktime doesn’t officially support it. Before my alternative was to use mplayer or ffmpegx, which do support AC3 avis.
The project seemingly has no documentation, but this sourceforge comment was helpful on understanding how to install it:
“For the benefit of anyone else new to adding components to Quicktime, just drop the downloaded “AC3 Codec.component” file into /Library/QuickTime.” – simonhobson

I already had an ac3 codec.component file, but I just renamed it and put this one in there and it works fine.

It’s slightly processor heavy and stutters a bit when quicktime’s in the background, but otherwise it plays fine.

Thanks to this site that led me to the codec, and also hosts a version for intel processors.

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