Is there a better alternative? Multimedia players that double up as a video editor are still rare. You can still use Quicktime 7.7.9 on Windows Vista or Windows 7 computer. Codec For Quicktime Player Mac High Sierra.Codec For Quicktime Player Mac Download.Codec For Quicktime Player Mac Software.So, if you wanna view H.265 files on Mac, you may try to install and use VLC to play H.265 under Mac OS X. Some guys find VLC media player, a free and open source player has added H.265 codec support that enables you to play H.265/HEVC videos. Now you can add and play the converted H.265 files in QuickTime player on Mac with ease.This update adds the following video codecs for use by QuickTime-based applications: Apple Intermediate Codec Apple ProRes AVC-Intra DVCPRO HD HDV XDCAM HD / EX / HD422 MPEG IMX Uncompressed 4:2:2.