QuickTime, a powerful multimedia technology with a built-in media player, QuickTime lets you view Internet video, HD movie trailers, and personal media in a wide range of file formats. And it lets you enjoy them in remarkably high quality. It is available for Mac OS classic (System 7 onwards), Mac OS X and Microsoft Windows operating systems. The latest version is QuickTime X (10.0) and is currently only available on Mac OS X Snow Leopard and newer.
QuickTime features advanced video compression technology called H.264 to deliver brilliant, crisp HD video using less bandwidth and storage. So you'll experience pristine video quality wherever you watch your movies or videos.
Many Mac users complain not able to play videos like AVI, WMV on QuickTime even with Perian plug-ins since they upgraded to Mavericks. That's probably because Perian hasn't been updated for Mavericks support. To solve the QuickTime video unsupported problem, you have some options. One is to find another vidoe player, like VLC Media Player. The other is to try a QuickTime Mavericks converter.
iOrgsoft Video Converter for Mac helps to solve the video incompatible issue to QuickTime Player as well as to other commonly used video players and editing players. It supports a large amount of file formats inlcuding MP4, MOV, AVI, DivX, RMVB, RM, WMV, FLV, AVCHD (MTS/M2TS), MXF, XAVC, and more. You are able to solve most video incompatible issues with it.