exec和shell_exec无法使用vlc -I rc命令

I wish to do recording of the live http streaming on the server side. I am able to do the recording on server via ssh and then writting the vlc -I rc command But when i write the same command in the exec function like :- exec("vlc -I rc REST_OF_THE_COMMAND"); IT doesnt works , But exec("ls -l") & exec("pwd") works

So my problem is that vlc command line is not working with the exec or shell_exec function.

Please check this answer (relates to executing commands from PHP). Once you know the exact problem, then it is easier to find a solution.

Executing wkhtmltopdf from PHP fails