This only means that you can't load AVI on QuickTime. That is why, when we try to load an AVI file on QuickTime, we get an error that the video format is not supported by it. Though, QuickTime, which is the default media player in Mac, does not have the codec for AVI included. Just like every other media format, AVI is also based on a codec system that is preloaded in Windows Media Player. The format was first introduced in 1992 and is still commonly used to contain video files. What is an AVI format?ĪVI stands for Audio Video Interleave and is a popular resource interchange file format that has been developed by Microsoft. Ideally, you can play AVI files on Mac, but when it comes to QuickTime, there can be an issue.