PHP Script for FFMPEG conversion - php

Question

Not been programming for long, so go easy.
Basically I'm attempting to write a PHP script that'll be able to automatically convert a folder full of .mp4's for me, and make them .flv's. This will be done for my entire TV collection (which is quite large) to allow for streaming over my local network within browsers.
I've currently got the following code:
// Save video files into an array
$vid = glob("../../*.mp4");
// Open text file in write mode
$fp=fopen("test.txt","w+");
// Write contents of array to file
foreach($vid as $key => $value){
fwrite($fp,$value."\n");
}
This is taking all of the mp4 files within the folder, and saving their filenames into a text file. The next step I need to take is to read each line, one by one, and perform an FFMPEG command on them until each line has been completed.
Any idea how I can achieve this? I know I'll have to use shell_exec somehow, but I've never used this before, and I'm a little bit stuck as to what to do next.
Thanks for any help

Answer 1

Here is the ffmpeg command line to convert all the mp4 files in a directory to flv files
for i in *.mp4; do ffmpeg -i $i -ar 44100 $i.flv; done
Here it is in php
// Change directory to the directory of the videos
chdir('../..');
// Run the command
exec('for i in *.mp4; do ffmpeg -i $i -ar 44100 $i.flv; done');