上传视频文件时出现问

Question

我上传视频，如果我上传图片所有工作，视频不上传

if(is_uploaded_file($_FILES['filename']['tmp_name']))
{
    $filename = iconv("utf-8", "windows-1251", $_FILES['filename']['name']);
    move_uploaded_file($_FILES['filename']['tmp_name'], "./video/" .$filename);
    $opis = $_REQUEST['opis'];
    $name = $_FILES['filename']['name'];

    $sql = "insert IGNORE INTO video (video,opis) values ('$name','$opis' )";
    $query = mysql_query($sql);
}

如何使此代码能够上传视频？