Ratings vary about from league to league - most internet non-usta leagues are a little soft - for example a 4.0 internet league rating is more like a 3.5-3.75 USTA rating. Also, USTA ratings vary a bit by area. The metro Atlanta area 4.0 level is a little stronger than some of the rural areas like Macon.
Also, it is difficult to review by video as everything looks slower.
The best way to get your rating is to play a few guys in your area and see how you stack up against them. You can also get their input on where you should play.
But, if you post a video, you'll get plenty of feedback and that may work for you too.