The .mts, .m2t and .m2ts are a container file format for multiplexing audio, video and other streams. It is based on the MPEG transport stream container and is also known as BDAV MPEG-2 transport stream. This format is commonly used for high definition video on Blu-ray Disc and AVCHD and HD Camcorders. It usually contain AVC/H264 or MPEG2 video.