AJAX - PHP - FFMPEG - Execution not completing - php

Question

Here is a slightly tricky situation:
I am using ajax to call a function that uses FFMpeg to convert a video.
The code all works fine EXCEPT:
The execution is cut short so I end up with a video of 2 frames.
I assume this is ajax causing the problem because as far as its concerned, its called the function and returned a success output to my php page.
In other words, the ffmpeg script cuts off when the ajax has completed.
Is there a way I can tell ajax to wait for the ffmpeg function to finish or do i need to set up a cron job for it to run in the background?
EDIT:
Heres the code:
AJAX:
// watermark($thevideo)
var ajaxurl = "<?php echo admin_url('admin-ajax.php'); ?>";
var formData = new FormData();
formData.append('thevideo', thevideo);
formData.append('action', "watermark");
$.ajax({
url: ajaxurl,
type: "POST",
data:formData,cache: false,
processData: false, // Don't process the files
contentType: false, // Set content type to false as jQuery will tell the server its a query string request
success:function(data) {
alert(data);
}
});
PHP FFMPEG Function:
// Watermark ***************
// IMPORTANT!
// This action & function can be called by ajax but requires absolute file paths!
add_action( 'wp_ajax_watermark', 'do_watermark' );
add_action( 'wp_ajax_nopriv_watermark', 'do_watermark' );
function getabspath( $file_url ){
return realpath($_SERVER['DOCUMENT_ROOT'] . parse_url( $file_url, PHP_URL_PATH ));
}
function do_watermark() {
session_start();
ini_set('display_errors', 1);
error_reporting(E_ALL);
// $thevideo = $_POST['thevideo'];
$thevideo = getabspath($_POST['thevideo']);
$newvideo = getabspath('./wp-content/uploads') . '/test.mp4';
$thewatermark = getabspath('./wp-content/uploads/mefbpic.png');
// For some reason we have to OMIT THE DRIVE LETTER from the watermark image path
// AND the backslashes need to be turned forward even tho its an absolute path!?!
$thewatermark = substr($thewatermark,2); // Cuts off the first 2 chars. - (C:)
$thewatermark = str_replace('\\','/',$thewatermark);
// require_once('./vendor/autoload.php');
require_once(getabspath('./vendor/autoload.php'));
$ffmpeg = FFMpeg\FFMpeg::create(array(
'ffmpeg.binaries' => getabspath('./FFMpeg/bin/ffmpeg.exe'),
'ffprobe.binaries' => getabspath('./FFMpeg/bin/ffprobe.exe'),
'timeout' => 3600, // The timeout for the underlying process
'ffmpeg.threads' => 12, // The number of threads that FFMpeg should use
));
$video = $ffmpeg->open($thevideo);
$video
->filters()
->resize(new \FFMpeg\Coordinate\Dimension(640, 360))
->watermark($thewatermark, [
'position' => 'relative',
'bottom' => 50,
'right' => 50,
])
->synchronize();
//$video
// ->save(new \FFMpeg\Format\Video\X264(), $thevideo);
$format = new \FFMpeg\Format\Video\X264();
$format->setAdditionalParameters(array('-y'));
$video->save($format, $newvideo);
echo 'done!';
}

Answer 1

Fixed it!
Just had to add
async: false,
to the ajax request!
Cheers ;)