libvpx编译过程：
wget https://github.com/webmproject/libvpx/archive/v1.6.1.zip
unzip libvpx-1.6.1.zip
cd libvpx-1.6.1/
./configure --prefix=/home/v/workspace/libvpx-1.6.1/build_lib --enable-realtime-only --enable-pic --enable-error-concealment --enable-examples --enable-vp8 --enable-pic --enable-shared --as=yasm
make
make install
libvpx源代码获取地址：
https://github.com/webmproject/libvpx/releases