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Running PHP from command line
<?php
$cmd = "ffmpeg inpupt.mpg output.m4v";

exec($cmd . ' 2>&1', $output, $return);

//Page continues...but not executed
$update = mysql_query("UPDATE.....");
?>

<?php system( 'sh test.sh >/dev/null &' ); ?>

<!--
    saving standard output to a file
    very important when your process runs in background
    as this is the only way the process can error/success
-->
<?php system( 'sh test.sh >test-out.txt &' ); ?>
<!--
    saving standard output and standard error to files
    same as above, most programs log errors to standard error hence its better to capture both
-->
<?php system( 'sh test.sh >test-out.txt 2>test-err.txt &' ); ?>