Streaming services do not work that way. With Netflix the quality of the stream will be based on the level of service you are paying for and then how well the internet is between you and their servers.
The quality levels are:
•Low (0.3 GB per hour) 480p
•Medium (SD: 0.7 GB per hour) 480p
•High (Best video quality, up to 3 GB per hour for HD (720p to 1080p24) and 7 GB per hour for Ultra HD (UHD))
•Auto (Adjusts automatically to deliver the highest possible quality, based on your current Internet connection speed)
Internet connection speed recommendations:
•0.5 Megabits per second - Required broadband connection speed
•1.5 Megabits per second - Recommended broadband connection speed
•3.0 Megabits per second - Recommended for SD quality
•5.0 Megabits per second - Recommended for HD quality
•25 Megabits per second - Recommended for Ultra HD quality
Amazon Prime works the same way but there is not an extra charge for the HD versions of 720p or 1080p24. I don't know if UHD is available.
Vudu is different as there is no subscription fee as it is a pay as you go system. You pay depending on the level of video quality you choose and then the ability of your internet connection.
The video quality selections are SD (480p), HD (720p), and HDX (1080p24). I use all HDX so you will need a constant 6meg to 9 meg connection in order to get a stable stream. Since I have a substantial investment in my HDX library as it mirrors my Bluray library, I have no interest to start buying any UHD even if I have a UHD capable device. I honestly don't believe UHD will be taken up by the general population as they will not pay the price for the content.
In my opinion Vudu is the best service of them all as the video quality is the best available of all the streaming services.
One thing worth noting is the content owners have been mastering all movie and non live TV shows in 1080p24 since around 1999. This was an idea that Sony came up with in order to save storage space, responds to compression very well, reduce bandwidth demands to transport, and to also provide constant high quality video playback no matter what method of transport would be used. So basically anything you are watching on a DVD, Bluray, OTA, cable, satellite, or any streaming service is coming from the same 1080p24 master. So if you are only getting an SD feed from Netflix it is coming from the 1080p24 master and then down converted to send to you.
Here is an article that was released in December of 1998 discussing how 1080p24 came about for digital communications.
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