./ffmpeg -i ../1_h264_1080p_30fps_3Mbps.mp4 -f rawvideo -y /dev/null -an
before:293
after :295

Change-Id: I5ff6cba4eaca0c4218c0c97b880ca500e35f9c87
Signed-off-by: Hao Chen <chenhao@loongson.cn>
Reviewed-by: Shiyou Yin <yinshiyou-hf@loongson.cn>
Reviewed-by: guxiwei <guxiwei-hf@loongson.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>