Originally Posted by gdkitty
Streaming, even in 4k, will almost ALWAYS be more compressed, than its bluray counterpart.
This is a pretty incredible claim, unless I'm misunderstanding your meaning.
If you mean that streaming in 4k streaming typically uses h.265 (aka HEVC) then yes, it's a more efficient encoding system which allows streaming video services to encode to get the same quality at a lower bitrate (at the cost of higher processor use for encoding/decoding).
But, I don't think that's what you mean. I suspect you mean "more compressed" in the same way that some people call MPEG-2 OTA TV signals "uncompressed". You mean that Blu-ray has fewer compression artifacts.
Personally, I think that Blu-ray makes poor use of bitrate.
Having better compression is a good thing. That means we get fewer compression artifacts. Blu-ray, the format, made bad choices if you like high quality video. If you don't want interlaced video and you want 1920x1080 resolution, then the best frame rate Blu-ray provides is 24fps. It can't do "HD" at a proper 60fps without interlacing the video, which produces horrible artifacts, which is like video compression from the 1950s.
As far as I'm aware, streaming video services haven't succumbed to the stupidity of using interlaced video formats. Video at 24fps is an example of a compression artifact. Lowering your frame rate is a method of compression, and unlike a 192+kbps MP3 (compared to a CD), 24fps video is extremely noticeable to humans, especially when the camera pans over a scene.
All the while, original Blu-ray formats burn a bunch of bitrate by not sufficiently compressing their audio. The video needed those extra bits, but the audio didn't because humans can't tell the difference between compressed and uncompressed audio. I mean, there are people who do claim to have a golden ear, but strangely those abilities suddenly disappear when proper blind A/B testing is performed
You'll note that the new version of Blu-ray (UHD) does support its max resolution @60fps, but that's a recent development; and I'd argue it doesn't matter. Blu-ray UHD is a stillborn format.
I'll also add that, yes, some people say they prefer low frame rate movies; they enjoy that particular compression artifact. No doubt, they'd also enjoy the "snow" effect you get at the top and bottom of video recorded on VHS tapes, or the sound of a record player's needle bumping over a small scratch on a vinyl record. But that's just nostalgia talking. Personally I think nostalgia is like cocaine: it makes people say stupid things.
I imagine a couple decades from now we'll have a trend where people are swapping low-resolution videos. I imagine they'll say that video doesn't feel "real" if they can't "see the pixels"!