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alexxonne said:

The FACT is that HD is any resolution higher than 640x480 or 768x576; being 720p one of them in any resolution combination.

You capitalized "FACT", so does that mean that this is what the literal definition of HD is?

Because I have a hard time accepting that my very first computer was hooked up to an HD monitor, a bulky, 4:3 CRT that maxed out at 800x600, running on an analog signal that provided a less than perfect picture and a flicker that was mesmerizing.

Maybe it was just ahead of it's time.

I jest. But yeah, it is certainly difficult to provide a definition to something that we all know and understand, but don't truly have a specific metric for. Looking back, the term "HD", which we are all familiar with, referred to the transition between old, CRT television sets and the newer, HDTV models which were capable of displaying a digital signal.

I wonder though. Maybe there's a reason YT removed the HD tag from 720p. I don't know the specifics, but when streaming YouTube over LTE, you are restricted to streaming in lower resolutions. Maybe this change is related to that, where YouTube is re-categorizing their streaming options in order to provide higher quality LTE streams.