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This video tutorial hammers at how to cut or trim an MP4 video without re-encoding by means of a lossless MP4 cutter - Joyoshare Media Cutter. You can easily trim it and makes no quality loss during the whole process. 
Official website: https://www.joyoshare.com/video-cutter-mac/

http://www.nicovideo.jp/watch/sm37042404