Split video using ffmpeg

ffmpeg -i Yao.mp4 -vcodec copy -acodec copy -ss 00:00:00 -t 00:06:00 -sn yao1.mp4 -vcodec copy -acodec copy -ss 00:06:00 -sn yao2.mp4

https://stackoverflow.com/questions/5651654/ffmpeg-how-to-split-video-efficiently