How to read information from .3gp and .mp4 using ffmpeg-php?

Question

I have a bit of a problem with ffmpeg-php. I'm trying to get some information from video files and it works pretty fine with file formats like .avi, .mpg or .flv but when I try to use .3gp or .mp4 in:

$movie = new ffmpeg_movie('path/to/file/test.3gp');

I get error like this :

ffmpeg_movie::__construct() []: ISO: File Type Major Brand: 3gp5 

or

ffmpeg_movie::__construct() []: ISO: File Type Major Brand: mp42 

I installed ffmpeg-php on WAMP using instructions found here: http://stackoverflow.com/questions/1172916/how-to-install-ffmpeg-in-wampserver-2-0-windows-xp

I need those information to send them to ffmpeg using exec(). Anyone could help me with this?