ffmpeg -i 19.mp4 -filter_complex "drawtext=fontsize=16:fontfile=/usr/share/fonts/TTF/FreeSans.ttf:fontcolor=#dddddd:shadowcolor=#000000:shadowx=0:shadowy=0:text='2016-07-15 表面結構左坴，右丸':x=w+101-12*t:y=25" -c:v libx264  -crf 20 -maxrate 850k -bufsize 1000k -preset fast -profile:v main -level 3.0 -keyint_min 25 -movflags +faststart -c:a aac -b:a 64k -ar 22050 19.x.mp4