From last post, What is m2ts file format, defined m2ts format, you must have some knowledge about m2ts files format. If you have some such files, you should wonder which program you should use to enjoy m2ts or how to playback m2ts files on mac.
This post will list some software to play m2ts files on mac os x (including snow leapord, tiger, lion).
VLC Media player is a powerful media player, playing most of the media codecs and video formats out there. And it is available for Windows(Windows XP, Vista, Windows7) and Mac OS X(Snow leapord, Leapord, Tiger, Lion).
Download and run this software, choose FILE>OPEN FILE, select your M2TS files, and that is OK! You can watch your video now:
PS: From tests that I carried out with a bunch of M2TS files, we can get the conclusion showed that VLC Media Player could play back the content (H.264 video and AC3 audio directly without needing DirectShow filters), but I did run into some problems with several M2TS files. And Some MTS/M2TS files can be played with ALLPlayer, MPlayer, Windows Media Player, Bsplayer and other media players, depending on used compression formats in a MTS/M2TS file. Some players will need an appropriate codec, component or plug-in installed.
Shareware to Playback M2TS files: M2TS Converter for Mac has built-in video player to preview m2ts files, which enables Mac users to easily convert videos, movies and TV shows straight to iPad, iPod (iPod touch 4 supported), iPhone (iPhone 4 supported) and other devices. It fully supports camcorder video formats like AVCHD (MTS/M2TS), AVCHD Lite, MOD/TOD, etc. This Mac M2TS Converter is perfectly compatible with Mac OS X Leopard and Snow Leopard.