If you’re running into AVI playback issues on your Mac (Mavericks & Mountain Lion included) and still have no clue, try these free AVI players for Mac. However, Perian is not popular any more these days, and to install a third-party codec plug-in is inconvenient. AVI is a container format used for compressed videos, and to play AVI videos on Mac with QuickTime, you’ll need a third-party plug-in such as Perian to guarantee to play any codec within an AVI file.
