why my exec function is failing in live server?

Question

I write a exec function to convert ogg to mp3 in my local its working fine but my main server its through an error trans failed.

below is my code.

exec("oggdec $file_path/{$file_name}.ogg -o - | lame - $file_path/{$file_name}.mp3",$output,$return);

file_path and file_name is also correct.

Answer 1

Assuming you mean shared host by live server :

In most of shared hosts the OS functions are restricted because of security risks.

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Update: You can also run a command like this, try it for testing if its allowed or not :

$cmd = `ls -l`;
echo $cmd; 

Or:

shell_exec('ls -l');