Codecs & formats empty

Hi,

The examples don't work in mi code, then I use example 9 code to view FFmpeg formats information.

This is the result:

This example shows you how to access the information about your ffmpeg installation.

FFmpeg-PHP Support
Congratulations you have the FFmpeg-PHP module installed.

This is the information that is accessible about your install of FFmpeg.

Array
(
[compiler] => Array
(
[configuration] => Array
(
)

[vhook-support] =>
[versions] => Array
(
)

)

[formats] => Array
(
)

[filters] => Array
(
)

[abbreviations] => Array
(
)

[ffmpeg-php-support] => module
)


All is empty.

What's is wrong??

I could find a complete installation guide?

Thanks