Am I using the class wrong?

I am trying to use this class to extract the first 30 seconds for a preview. Here is my code

include("class.mp3.php");
$file_input = "开发者_运维问答hat.mp3";
$file_output = "output.mp3";
$mp3 = new mp3($file_input); 
$mp3_1 = $mp3->cut_mp3($file_input, $file_output, 0, 30);

hat.mp3 is in the same directory and I was expecting to see output.mp3 as the 30 second clip...any ideas what i am doing wrong of if there is an easier and better library to use for this case....

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cut_mp3 function and other function get_mp3 etc uses '@' operator:

 if(!$fp = @fopen($file_output, 'wb')) {
    return false;
 }

And you will not see any error message. First of all check permission to directory.

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The Web server needs to have write permissions for the directory where you want to output your MP3. Unfortunately the class doesn't seem to have any error-handling for when it can't write the output MP3.