Download the Elmedia Player app either from App Store or official website.
QuickTime does not support some codecs used to encode audio and video tracks within an AVI file. Therefore, when you try to open this format, the player will not play it. The easiest way to solve this issue is to use a versatile and multifunctional player like Elmedia.
This player provides exceptional video quality and boasts compatibility with almost all media formats, including .avi, .mpg, .mkv, .wmv, .mov, .flac, .m4v, and .mp4. It does not require additional plugins or codec packs to work.