function _get_video_attributes($video, $ffmpeg) {

    $command = $ffmpeg . ' -i ' . $video . ' -vstats 2>&1';
    $output = shell_exec($command);

    $regex_sizes = "/Video: ([^,]*), ([^,]*), ([0-9]{1,4})x([0-9]{1,4}), ([^,]*), ([0-9]{1,4})/"; // or : $regex_sizes = "/Video: ([^rn]*), ([^,]*), ([0-9]{1,4})x([0-9]{1,4})/"; (code from @1owk3y)
    if (preg_match($regex_sizes, $output, $regs)) {
        $codec = $regs [1] ? $regs [1] : null;
        $width = $regs [3] ? $regs [3] : null;
        $height = $regs [4] ? $regs [4] : null;
        $fps = $regs [6] ? $regs [6] : null;
    }

    $regex_duration = "/Duration: ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2}).([0-9]{1,2})/";
    if (preg_match($regex_duration, $output, $regs)) {
        $hours = $regs [1] ? $regs [1] : null;
        $mins = $regs [2] ? $regs [2] : null;
        $secs = $regs [3] ? $regs [3] : null;
        $ms = $regs [4] ? $regs [4] : null;
    }

    return array('codec' => $codec,
        'width' => $width,
        'height' => $height,
        'hours' => $hours,
        'mins' => $mins,
        'secs' => $secs,
        'ms' => $ms,
        'fps' => $fps,
    );
}

if($duration < 10){
        $interval = floor($duration / 2);
        $image = "thumb/".$filenopath."_thumb_".$num.".jpg";
        shell_exec($ffmpeg." -ss ".$interval." -i ".$upfile." -vf select='eq(pict_type,I)' -vframes 1 -vf scale=-1:240 ".$thumb."00".$i.".jpg");
        rename($image,"thumb/".$image);
}else{
for ($i = 1; $i <= 6; $i++) {
        $interval = floor(($i - 0.5) * $duration / $i);
        $log  = $ffmpeg." -ss ".$interval." -i ".$upfile." -vf select='eq(pict_type,I)' -vframes 1 -vf scale=-1:240 ".$thumb."00".$i.".jpg".PHP_EOL;
        //file_put_contents('./log'.date("j.n.Y").'.txt', $log, FILE_APPEND);
        shell_exec($ffmpeg." -ss ".$interval." -i ".$upfile." -vf select='eq(pict_type,I)' -vframes 1 -vf scale=-1:240 ".$thumb."00".$i.".jpg");
}