Apple apps such as QuickTime Player, Photos, and Keynote work with many kinds of audio and video formats. Some apps prefer specific formats, but QuickTime movie files (.mov), most MPEG files (.mp4, .m4v, .m4a, .mp3, .mpg), some AVI and WAV files, and many other formats usually work in most apps without additional software.
Older or specialized media formats might not work in your app, because the format requires software designed to support it. If that happens, your app won't open the file or won't play back its audio or video.
Mac OS X 10.6 Snow Leopard. Mac OS X 10.5 Leopard. Get it for PowerPC or 32bit Intel. Mac OS X 10.4 Tiger. Mac OS X 10.4.7 or later is required. Get it for PowerPC or Intel. Mac OS X 10.3 Panther. QuickTime 6.5.2 or later is required. Get it for PowerPC.
Writes 'Multiple news organisations are reporting on an in-the-wild Mac OS X malware attack that uses porn lures to plant phishing Trojans on Mac machines.The attack site attempts to trick users into download a disk image (.dmg) file disguised as a codec that's required for viewing the video.
How to search for an app that works with your file
You might already have an app that supports the format of your file. If you don't know which of your installed apps to try, your Mac might be able to suggest one:
Control-click (or right-click) the file in the Finder.
From the shortcut menu that opens, choose Open With. You should see a submenu listing all of the other installed apps that your Mac thinks might be able to open the file.
If none of your installed apps can open the file, search the Internet or Mac App Store for apps that can play or convert the file:
Usb Audio Codec Mac
Include the name of the media format in your search. To find the format, select the file and press Command-I to open an Info window. The format might appear after the label Kind, such as ”Kind: Matroska Video File.”
Include the filename extension in your search. The extension is the letters shown at the end of the file's name, such as .avi,.wmv, or .mkv.
Learn more
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. Free Apple Mac/OS X 10.9.
Media Player Codec Pack Mac
QuickTime Player (version 10.0 and later) in OS X Mavericks through macOS Mojave converts legacy media files that use certain older or third-party compression formats.
Learn about incompatible media in Final Cut Pro X and iMovie.