<?php
    protected function createThumbnails($video, $videoDir)
    {

        $thumbsDir = $videoDir.'/thumbs/';
        if (!file_exists($thumbsDir) ) {
            mkdir($thumbsDir);
            chmod($thumbsDir, 0777);
        }

        $ffmpeg = $this->getFFMpeg();
        $ffprobe = $this->getFFProbe();

        $ffmpeg = $ffmpeg->open($videoDir.'/'.$video->getOriginal());

        $duration = $video->getDuration();

        $step = floor($duration/12);
        for ($i=1; $i < 13; ++$i) {
            $ffmpeg->extractImage($i*$step, $thumbsDir.$i.'.jpg');
        }
        $ffmpeg->close();

        $this->createSprite($video, $thumbsDir);
    }

    protected function createSprite($video, $thumbsDir)
    {
        $imagine = new \Imagine\Gd\Imagine();

        $image = $imagine->create(
            new \Imagine\Image\Box(200*12, 150)
        );
        for ($i=1; $i < 13; ++$i) {
            $thumb = $imagine->open($thumbsDir.'/'.$i.'.jpg');
            $thumb->resize(new \Imagine\Image\Box(200, 150));
            $image->paste($thumb, new \Imagine\Image\Point(($i-1)*200, 0));

        }

        $image->save($thumbsDir.'/../sprite.jpg');


    }