On you Mac, go to System Preferences > Security & Privacy > General > Allow apps downloaded from… and set your preference, try to open Perian again to see if it works. Q: I've tried to download Perian from different sources but none of them can be opened because of unidentified developer. You file should be playing in QuickTime with the help of Perian.

Select Open With and Perian - Open in QT Player on the list.

Find the media file you'd like to play on your computer.

With its built-in 370+ video audio codecs, no additional video codecs or plugins are needed. The software can quickly convert 4K, 1080P, 720P, SD video of MKV, FLV, WMV, AVI, H.265 to QuickTime supported formats MOV, MP4, MPEG-4, H.264. MacX Video Converter Pro, a robust alternative to Perian, will help QuickTime play any media file without errors. Perian Alternative: Play Videos on QT without Any Issue Note that if you are using QuickTime 10 or above, the most efficient way to play videos on QuickTime without unsupported video container/codec format issues is to use a video converter for Mac. If you are still using this component for QuickTime 7.6.6 or older, get started with QuickTime Perian tutorial and learn how to download, install and use it for Mac. With the components installed on macOS, QuickTime is able to handle a motley collection of formats, from the commonly used MKV, FLV, MPEG-4, H.264, H.263, WebM, VP8, SRT/SSA subtitles to the less known formats HuffYUV, and more.

Perian, the swiss-army knife of QuickTime components, is designed to expand the file formats and subtitles supported by QuickTime Player.

Dpwnload quicktime video converter