i found a really nice M2TS Video Converter. it is really powerful that can convert M2TS to AVI, MP4, WMV, 3GP and all the popular video formats. It also natively supports converting MTS, TS, TOD, MOD and more. Aiseesoft M2TS Converter can efficiently convert all audios to AAC, AC3, MP3, M4A, MP2, OGG, WAV, WMA and more, or extract audio from M2TS, TS and others to those audio formats.
it is really fast and can do many video editing works, such as trim, crop, merge and so on.