转载地址:http://blog.csdn.net/gubenpeiyuan/article/details/19548019?utm_source=tuicool&utm_medium=referral
使用ffmpeg进行图像格式转换以及图像缩放/sws_scale/linux/c++/c/rgb-yuv420
转载地址:http://blog.csdn.net/skys_broyal/article/details/10337147
原文:http://www.cnblogs.com/hyz5525/p/5227422.html