第 1 步
1、下载FFmpeg最新版本:http://ffmpeg.org/download.html#build-mac
2、下载gas-preprocessor.pl:https://github.com/libav/gas-preprocessor
3、下载yasm最新版本:http://www.tortall.net/projects/yasm/releases/ (例如:yasm-1.3.0.tar.gz)
4、下载build-ffmpeg.sh: