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If you've ever plugged in a 2010-era camcorder and found .mts files on the memory card, you've met AVCHD. Sony and Panasonic co-developed the format for consumer HD camcorders, wrapping H.264 video in a Blu-ray-derived MPEG-2 transport stream container. It records excellent quality at the expense of a complicated folder structure that confuses anyone who just wants to copy a video file.
The format stores 1080i or 1080p video at bitrates up to 28 Mbps — genuinely good quality for its era. Most modern editing software (Premiere Pro, DaVinci Resolve, Final Cut Pro) imports MTS natively, though some free editors struggle with the interlaced variants.
For sharing or archiving, convert to MP4. The video stream is already H.264, so a remux (repackaging without re-encoding) is often possible and takes seconds. FFmpeg handles this cleanly: `ffmpeg -i input.mts -c copy output.mp4`. If the audio is AC3, you may need to transcode the audio track to AAC.