If you need help in finding the correct package matching your Mac's processor architecture, please see this official support document by Apple.
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MPlayerX is a simple, but beautiful player that will handle almost any media format you throw at it, without the need to install any extra plug-ins or codec packages.
It will also detect and play most subtitle files, without too much hassle. However if you are using a previous version of QuickTime, feel free to install Perian.
As you can see, there are plenty of solutions if you encounter problems trying to play media on your Mac. Use VLC 2.
Get it here. Get it for PowerPC or 32bit Intel.
Use VLC 0. Get it for PowerPC or Intel.
How to Play Matroska MKV Files on Mac (1080p, 720p, etc.)
Get it for PowerPC. VideoLAN software is licensed under various open-source licenses: Image credit: There is some argument as to whether or not a codec pack is genuinely required. This derives from the fact that some codec packs in the past have been compiled from pirated and hacked software, thereby making their legality extremely dubious. Additionally codec packs often seem to feature codecs performing duplicate tasks — a sure sign of needless bloatware.
However there are various codecs that can be used safely and legally on your Mac.