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1080 vs 4k | SDR vs HDR in 1 video (lemmy.ml)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

11 comments fedilink hide all child comments

Is there a video which compares 1080 and 4k and another one comparing HDR vs SDR?

When I watch 4k content I think, wow, this is great detail. But when I watch 1080 this is very good, but the tiny people in the background wouldn't be blurred in 4k.

And when I watch a dark SDR video I hate that the movie companies didn't release HDR quality although it's a recent movie/ series. But how would I know if it would be better?

I always think that the grass is greener on the other side, but how would I know?

Would it be hard to create such a video file? I guess with ffmpeg. But all else would need to be kept constant which is the difficult part

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[–] [email protected] 23 points 7 months ago (3 children)

Not really possible. A 1080p video smashed into a 4k container (so it can actually represent the 4k part) would look worse than a true 1080p video file since that would get up scaled by your TV or monitor in most situations.

Best comparison would be making a playlist of the same video first in 1080p and then 4k.

[–] [email protected] 3 points 7 months ago (1 children)

Correct me if im wrong, but if you play a 1080p video on a 4k screen, that would be upscaled. If you put a 1080p video in a 4K stream, then play that 4k stream on the 4k screen, no post-processing would be applied to the video on the screen. All the upscaling happens during encoding, where you have far more control over the upscaler quality.

[–] [email protected] 3 points 7 months ago* (last edited 7 months ago)

Yes, which is exactly what I'm stating. Showing a forcibly non-upscaled video (or one where you've manually tweaked the upscaling for that matter) is likely not what you want because there are no circumstances where that is what you'd watch on that particular screen. It could perhaps work as an example of how that video would look if you had a 1080p monitor of the same size instead of the 4k one you have, since it scales in a linear fashion, a pixel of 1080p is 4 pixels in a square on a 4k screen. But that's likely not what you want to test. Instead the thing you do want to test is "does it matter if I download X content in 1080p or 4k? How big is the difference really?" And if that is the question you need to let it upscale.

[–] [email protected] 2 points 7 months ago

Dang was hoping to do that with mkvtoolnix. That way I could have 2 different resolutions of the same video in one file

[–] [email protected] 7 points 7 months ago

Thanks, that's great advice!