FFmpeg::thumb PHP Method

    public function thumb($size, $start, $videoFrames = 1)
    {
        //$input = false;
        if (!is_numeric($videoFrames) or $videoFrames <= 0) {
            $videoFrames = 1;
        }
        $this->audioDisable();
        $this->size($size);
        $this->position($start);
        $this->videoFrames($videoFrames);
        $this->frameRate(1);
        return $this;
    }