在Mac上面编译FFmpeg需要安装很多东西，首先是：autoconf 和 automake
curl -O http://mirrors.kernel.org/gnu/m4/m4-1.4.13.tar.gz
tar -xzvf m4-1.4.13.tar.gz
cd m4-1.4.13
./configure --prefix=/usr/local
make
sudo make install
cd ..
curl -O http://mirrors.kernel.org/gnu/autoconf/autoconf-2.65.tar.gz
tar -xzvf autoconf-2.65.tar.gz
cd autoconf-2.65
./configure --prefix=/usr/local # ironic, isn't it?
make
sudo make install
cd ..
# here you might want to restart your terminal session, to ensure the new autoconf is picked up and used in the rest of the script
curl -O http://mirrors.kernel.org/gnu/automake/automake-1.11.tar.gz
tar xzvf automake-1.11.tar.gz
cd automake-1.11
./configure --prefix=/usr/local
make
sudo make install
cd ..
curl -O http://mirrors.kernel.org/gnu/libtool/libtool-2.2.6b.tar.gz
tar xzvf libtool-2.2.6b.tar.gz
cd libtool-2.2.6b
./configure --prefix=/usr/local
make
sudo make install
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