I use iDealshare VideoGo to convert mts, m2ts, avchd, ts, mxf etc to mp4, mov, avi, apple prores, mpg etc.
It has both Mac and Windows version.
I also use it to do some basic editing like merge, rotate, effect, adjust audio volume, change video aspect ratio, resolution etc.
You may get it here: https://www.idealshare.net/video-converter-mac.html

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