Various file formats are supported by the program such as MKV, AVI, FLV, MTS/AVCHD, WMV, MPG, etc. It has the capacity to convert video to Yosemite most compatible MOV, MP4 format to play with QuickTime, iTunes. Here Pavtube iMedia Converter for Mac is such an video converter for Yosemite. Hot Search: QuickTime Play YouTube | Blu-ray/DVD/ISO to QuickTime | AVCHD to Quicktime It adopts the post-Yosemite design language of macOS and keeps up the pace of new technologies like Force Touch, Touch Bar, and Picture-in-Picture. It used to be efficient but now Apple disabled 3rd party extensions and Perian hasn't been updated for Yosemite.So the task for you is to search for a reliable QuickTime Alternative for Yosemite to play various video files. IINA is born to be a modern macOS application, from its framework to the user interface. In the past, although we know Quicktime player is picky on video formats, we can make it work with more video types by using Perian video plug-in. Things are even worse when watching videos on website as QT doesn't show the content.
QuickTime 7 Pro, as the most preferable media player for Mac users, has been reported 'not working after upgrading to Mac Yosemite'. I tried to download them but QT still won't open files like AVI. 'Since updating to Yosemite, my Quicktime plug-in has stopped working in Safari, Firefox, and Chrome.