Though both MTS and M2TS are file extensions for the same AVCHD and both support 720p and 1080i HD video formats, there is a slight difference between the two. In the M2TS file, the video file is saved in the high definition Blue-ray BDAV format. Video data on the Blue-ray discs can be saved in one of the three video codecs – MPEG2 Part 2, H.264/MPEG-4 AVC, or SMPTE VC-1; and the audio data in either Dolby digital, DTS, or the uncompressed Linear PCM. The M2TS file extension is written as ‘xxxxx.m2ts’ where the ‘xxxxx’ are a five digit number corresponding to the audio-visual clip.
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