http://d.hatena.ne.jp/oni-chan/20100111/1263185671
X264_mp4 =-f mp4 -vcodec libx264 -aspect 16:9 -vtag mp4v -crf 24 -flags2 dct8x8 -level 51 -acodec libfaac -ac 2 -ar 48000 -ab 128k -s 1280x720 -y -threads 8 -coder 1 -deinterlace -top -1 -qmin 10 X264_mp4_EXT =mp4