> I don't really understand why the approach Perian undertook was abandoned when Perian itself was. Perian's approach was to implement additional codec/contain

> I don't really understand why the approach Perian undertook was abandoned when Perian itself was. Perian's approach was to implement additional codec/container support as a QuickTime component. QuickTime has been deprecated for several years, and AVFoundation doesn't provide any component or plugin interface for 3rd parties to add codecs.