阿里云服务器CentOS7.8安装x264/libav

网上常见的在CentOS7 x64中安装x264和libav的方法是：

git clone http://git.videolan.org/git/x264.git
./configure –disable-asm
make
make install

wget http://download1.rpmfusion.org/free/el/updates/7/x86_64/x/x264-libs-0.148-24.20170521gitaaa9aa8.el7.x86_64.rpm
wget http://download1.rpmfusion.org/free/el/updates/7/x86_64/x/x264-devel-0.148-24.20170521gitaaa9aa8.el7.x86_64.rpm
rpm -hiv x264-libs-0.148-24.20170521gitaaa9aa8.el7.x86_64.rpm
rpm -hiv x264-devel-0.148-24.20170521gitaaa9aa8.el7.x86_64.rpm
cd /usr/local/src
git clone https://gitee.com/nwaycn/libav.git
cd libav
./configure --enable-pic --enable-shared  --enable-libx264 --enable-gpl --extra-libs="-ldl"
make                                                                                  
make install
cp /usr/local/lib/pkgconfig/libavcodec.pc    /usr/lib64/pkgconfig/
cp /usr/local/lib/pkgconfig/libavdevice.pc   /usr/lib64/pkgconfig/
cp /usr/local/lib/pkgconfig/libavfilter.pc   /usr/lib64/pkgconfig/
cp /usr/local/lib/pkgconfig/libavformat.pc   /usr/lib64/pkgconfig/
cp /usr/local/lib/pkgconfig/libavresample.pc /usr/lib64/pkgconfig/
cp /usr/local/lib/pkgconfig/libavutil.pc     /usr/lib64/pkgconfig/
cp /usr/local/lib/pkgconfig/libswscale.pc    /usr/lib64/pkgconfig/
ldconfig

但在个人环境中，如此编译过程中，总有报错。系统也是CentOS7 x64 2003版本，后来网上找了一套的x264和libav，编译起来没问题一直在用。

但近日在阿里云服务器上CentOS7.8 x64，用我找的这套编译又报错，主要是libav不能正常编译通过，修改代码要改的地方太多。

首先是：

libavcodec/libx264.c: In function 'X264_frame':libavcodec/libx264.c:246:9: error: 'x264_bit_depth' undeclared (first use in this function)if (x264_bit_depth > 8)^libavcodec/libx264.c:246:9: note: each undeclared identifier is reported only once for each function it appears inlibavcodec/libx264.c: In function  'X264_init_static'

找到该文件，将小写改为大写后，重新编译

undefined reference to  x264_encoder_open_160

各种错误，要一点一点去改，太麻烦了。

于是再去尝试上面两种git clone方式，居然通过了，很神奇，先记录一下。