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I recently treated myself to a HD camcorder as I will be going on holiday to California soon for a family wedding. I got the camcorder a bit early so I could have a chance to play around with it and practice editing the clips, the camcorder records the clips in a .MTS format which is a High-definition MPEG Transport Stream video format, commonly called "AVCHD" used by Sony, Panasonic, and other HD camcorders; based on the MPEG-2 transport stream and supports 720p and 1080i HD video formats.
If you've got some AVCHD videos (with M2TS/MTS extension) and want to convert them to AVI videos just like me, you need a Mac HD video converter tool to do this job. I find there are lots of similar programs on the market, after tried some of them, I picked up one called iFunia HD Video converter for Mac(http://www.ifunia.com/hd-video-converter-mac.html) to convert AVCHD video to AVI for myself. This software is a free trial application for Mac OS X that accomplishes this task quickly and easily. It helps me rip/convert AVCHD video to any common video/audio formats for playback on media players and mobile devices.
Click the following link,I'll show you how to convert the AVCHD videos to AVI format on Mac step-by-step.
http://www.ifunia.com/avchd-column/index.html