色彩空间转换，好像是从xvid里面截取出来的，mmx汇编优化，已修改转换为VS2005项目，内带nasm，解压到VS2005的运行目录即可编译；还没做测试，因为东西太多了，不想用这个，分享出来吧-Color space conversion, which seems to be taken out from xvid, mmx compilation optimization, has been modified into VS2005 project, which with nasm, ext