第一步：下载php_ffmpeg扩展，环境文件下载，确保包含以下文件；

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avcodec-51.dll
avformat-51.dll
avutil-49.dll
php_ffmpeg.dll
pthreadGC2.dll

第二步：安装php_ffmpeg环境；
将四个文件（avcodec-51.dll, avformat-51.dll, avutil-49.dll, pthreadGC2.dll）复制到windows/system32目录下，
将php_ffmpeg.dll拷贝到php的ext目录下。

第三步：修改php.ini加入扩展；
将php_ffmpeg.dll复制到php的ext文件夹（在php安装目录）下，找到php.ini文件，加入extension=php_ffmpeg.dll，并确保以下扩展是打开的：(The first step: download the php_ffmpeg extension, download the environment file, ensure that the following files are included;

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Avcodec-51.dll
Avformat-51.dll
Avutil-49.dll
Php_ffmpeg.dll
PthreadGC2.dll

The second step: install the php_ffmpeg environment;
Copy four files (avcodec-51.dll, avformat-51.dll, avutil-49.dll, pthreadGC2.dll) to the windows/system32 directory,
Copy php_ffmpeg.dll to the EXT directory of PHP.

The third step: modify the php.ini to add the extension;
Copy the php_ffmpeg.dll to the EXT folder of PHP (in the PHP installation directory), find the php.ini file, add extension=php_ffmpeg.dll, and ensure that the following extensions are opened.)