用ffmpeg进行高清下变换
c:ffmpeg -i 00002.mts -vcodec mpeg2video -pix_fmt yuv422p -acodec mp2 -b:a 384k-g 45 -bf 2 -trellis 2 -me_method epzs -me_range 32 -cmp 2 -subcmp 2 -keyint_min25 -mbd 2 -b:v 8000K -bt 500k -mi
