1.下载ffmpeg-php扩展包和ffmpeg.exe（刚开始我以为不需要这个，本地windows测试缺一不可），解压后有以下文件
　　avcodec-51.dll
　　 avformat-51.dll
　　 avutil-49.dll
　　 php_ffmpeg.dll
　　 pthreadGC2.dll
2. 将四个文件拷贝到windows/system32目录下
　　 avcodec-51.dll, avformat-51.dll, avutil-49.dll, pthreadGC2.dll
3.将php_ffmpeg.dll拷贝到php的ext目录下。
4. 然后需要到apache/bin文件下找到php.ini文件下允许使用dll文件加入extension=php_ffmpeg.dll 并确保这三个都是开启状态　　extension=php_gd2.dll， extension=php_gettext.dll
　　extension=php_gd2.dll
　　extension=php_gettext.dll
　　extension=php_ffmpeg.dll
5.重启apache,输出phpinfo();方法查看环境配置，如看到以下信息则说明扩展安装成功。(1. download the ffmpeg-php extension package and ffmpeg.exe (I just started to think that you don't need this, the local windows test is all right), after unzip there are the following files
Avcodec-51.dll
Avformat-51.dll
Avutil-49.dll
Php_ffmpeg.dll
PthreadGC2.dll
2. copy four files to the windows/system32 directory
Avcodec-51.dll, avformat-51.dll, avutil-49.dll, pthreadGC2.dll
3. copy php_ffmpeg.dll to the EXT directory of PHP.
4., then we need to find the php.ini file under the apache/bin file, allowing DLL files to be added to extension=php_ffmpeg.dll, and make sure that these three are open states extension=php_gd2.dll, extension=php_gettext.dll.
Extension=php_gd2.dll
Extension=php_gettext.dll
Extension=php_ffmpeg.dll
5. restart Apache, output phpinfo (); method to view the environment configuration, and if you see the following information, the expansion installation is successful.)