This eliminates the absolute necessity for a large internal battery or supercapacitor to "close" a file before the device shuts down. Converting to MP4

The standout feature of downloading or using these files is that the TS format saves video data frame-by-frame in real-time.

How to Convert M2TS to MP4 with Wise Video ... - WiseCleaner

A free tool for Mac/PC where you can use the "Convert / Stream" option to turn your files into MP4 format.