Reasons to convert MTS as suitable ones for Mac So I consider if I can find the best free MTS/M2TS converter to transcode MTS/M2TS to Mac supported formats like MP4 or MOV, etc.” mts files on the camera, some errors often appeared there when I add them to Mac. “How could I freely convert the MTS/M2TS files to some common ones for playback smoothly on media players on Mac? I’m left with a bunch of.