ffmpeg -i 1_h264_1080p_30fps_3Mbps.mp4 -f rawvideo -s 640x480 -y /dev/null -an
before: 101fps
after:  138fps
Signed-off-by: Hao Chen <chenhao@loongson.cn>
Reviewed-by: yinshiyou-hf@loongson.cn
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>