PHP detect if shell_exec() command failed

Question

I'm running the ffmpeg command within PHP's shell_exec() to convert several videos in a list. Is there anyway to detect if an error happened while the video was being converted (or atleast verify it fully completed the conversion)?

I don't want to stop converting other videos if an error happens, just the ability to record the error.

<?php
    shell_exec('ffmpeg -i downloads/flv/file1.flv -vcodec libvpx -acodec libvorbis downloads/webm/file1.webm');

    if(error) {
     //run a command here to report the error (ie. MySQL or email)
    }
?>

shell_exec returns the output of executed commend, if ffmpeg prints the error you should be able to parse it. — user529649
– user529649, Commented Oct 28, 2011 at 0:15

deceze · Accepted Answer · 2011-10-28 00:16:35Z

14

Capture the exit code with another system call function like exec:

exec('ffmpeg ...', $output, $return);

if ($return != 0) {
    // an error occurred
}

Any decent utility will exit with a code other than 0 on error.

answered Oct 28, 2011 at 0:16

deceze♦

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2 Comments

Cloudscape Germany Over a year ago

Or check if ($return != 1). 1 is an error and 0 is no error exit code. You can debug in the Unix CLI directly with echo "$?" after executing your command.

deceze Over a year ago

Well, 0 means "all green", while anything other than 0 means "error". There are more error codes than just 1. I don't know if ffmpeg in particular uses anything besides 0 and 1.

user557846 · Accepted Answer · 2011-10-28 00:19:17Z

-2

$return=shell_exec('ffmpeg ...');

if ($return) { //look at what it returns do what you will with the data

}

answered Oct 28, 2011 at 0:19

user557846

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