h264_qsv    frame=  250 fps=0.0 q=-0.0 Lsize=    1401kB time=00:00:10.00 bitrate=1146.8kbits/s speed=  14x
libopenh264 frame=  250 fps=0.0 q=-0.0 Lsize=     538kB time=00:00:10.00 bitrate= 440.1kbits/s speed=11.7x
libx264     frame=  250 fps=132 q=-1.0 Lsize=     516kB time=00:00:10.00 bitrate= 422.5kbits/s speed=5.27x
dxva2       frame=  250 fps=129 q=-1.0 Lsize=     516kB time=00:00:10.00 bitrate= 422.5kbits/s speed=5.17x

ffmpeg h264 encdoer 速度对比