Failed to load PHP_ffmpeg.dll

Question

tried to do this job but no luck.

I always get

PHP Warning: starting PHP: cannot load the dynamic library "C: \ xampp \ php \ ext \ php_ffmpeg.dll" - the specified module was not found.

• Using XAMPP 1.7.4 on a 64-bit Windows 7 computer.
• I tried several php_ffmpeg.dll files, but I still encounter an error.
• Make sure the dll is located in C: \ xampp \ php \ ext and copied another DLL on both system32 and SysWOW 64.
• Previously used the latest version of WAMPP, but no luck, so I decided to upgrade to XAMPP with a lower version.

If this does not work, are there other scripts that I can use to convert downloaded audio files other than using FFMPEG? downloaded audio files have the extension .wav ..

thanks