Here is a quick tutorial on how to install Perian video decoder on OSX. This is a plugin that you install through Mac OSX utility. This will expand the video codecs and formats you can play via QT Quicktime.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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