centOS安装FFmpeg的方法，php截取上传视频的某一帧作为缩略图FFmpeg组件

yum install epel-release -y
yum update -y
rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro
rpm -Uvh http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm
yum install ffmpeg ffmpeg-devel -y
ffmpeg
git clone https://github.com/nilsringersma/ffmpeg-php # 下载ffmpeg-php的相关文件
cd ffmpeg-php # 转到 ffmpeg-php 的目录
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config --enable-skip-gd-check # 配置
make # 编译 
make install # 安装
Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/
修改php配置文件：vim /usr/local/php/etc/php.ini
加入这句：
extension=/usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/ffmpeg.so
重启php-FPM ：/etc/init.d/php-fpm restart
查看扩展安装情况：
php -m