https://ffmpeg.org/about.html
http://video.stackexchange.com/questions/17740/tool-for-cutting-video

mkv 1080p to mp4 720p
normal yt quality

ffmpeg -i D:\00\09\00.mkv -vf scale=-2:720 -c:v libx264 -preset slow -crf 22 -profile:v high -level 4.0 -pix_fmt yuv420p -movflags +faststart -c:a aac -b:a 128k D:\00\09\00.mp4