Download QuickTime Player 7 for Mac OS X v10.6.3 and Unlock QuickTime Pro Features

QuickTime is a discontinued[1] extensible multimedia architecture created by Apple, which supports playing, streaming, encoding, and transcoding a variety of digital media formats.[2][3] The term QuickTime also refers to the QuickTime Player front-end media player application,[2] which is built-into macOS, and was available for download on Windows until 2016.[4]

The QuickTime Player looping trick obviously requires a video to be stored locally on the Mac hard drive, or accessible through a network volume. Of course if the video you want to loop is online and accessible from the web, many web based video players allow the same playback features, and you can easily loop YouTube videos directly in the browser without any added software, and without downloading the video to the computer.

download quicktime player 7 for mac os x v10.6.3

If you don't want to convert AVI file to a QuickTime format, nor download the earlier version of QuickTime 7, another solution for native AVI playback on Mac is to use something like VLC media player.