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| Does the length of HDMI 2.1 cable matter? |
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| wraper:
--- Quote from: eeguy on June 14, 2022, 01:35:05 pm ---I tried their DisplayPort 1.4 to HDMI 2.1 adapter but there are issues with fuzzy text. --- End quote --- Then likely it does 4:2:0 or 4:2:2 chroma subsampling. |
| tooki:
--- Quote from: eeguy on June 14, 2022, 01:35:05 pm ---So they are like the Apple in the cable industry? I tried their DisplayPort 1.4 to HDMI 2.1 adapter but there are issues with fuzzy text. I also tried Club3D's adapter and cable but the display could not even detect the PC. Know any good DisplayPort 1.4 to HDMI 2.1 adapter that can do 4K@120/144Hz with chroma 444? --- End quote --- Blurriness isn’t, as far as I understand it, a possible symptom of a bad DP-HDMI adapter: marginal connections manifest as “sparkles” (random-color pixels) and handshaking failure (display isn’t recognized at all, or flashes or drops out completely). Remember that standard DP-HDMI adapters don’t actually do anything: they just connect pins of the two connectors. The DisplayPort output of the graphics card actually just detects the presence of the adapter and then changes its signaling to output HDMI signals instead. |
| wraper:
--- Quote from: tooki on June 14, 2022, 03:56:46 pm ---Remember that standard DP-HDMI adapters don’t actually do anything: they just connect pins of the two connectors. --- End quote --- Actually they do. Passive adapters have a level shifter in them. However with given resolution/refresh rate it must be an active adapter. --- Quote ---The DisplayPort output of the graphics card actually just detects the presence of the adapter and then changes its signaling to output HDMI signals instead. --- End quote --- It outputs HDMI signal, however voltages are wrong for HDMI, hence level shifter is needed. |
| tom66:
I'm reasonably sure the 8K/120Hz standard (who the hell asked for that outside of broadcast editing?) is using a form of near-lossless compression. That's why it can run on the 4K/120Hz cables. The bitrate is about 25% that of a compressed stream. It's probably also chroma subsampled. |
| tooki:
--- Quote from: wraper on June 14, 2022, 04:45:51 pm --- --- Quote from: tooki on June 14, 2022, 03:56:46 pm ---Remember that standard DP-HDMI adapters don’t actually do anything: they just connect pins of the two connectors. --- End quote --- Actually they do. Passive adapters have a level shifter in them. However with given resolution/refresh rate it must be an active adapter. --- Quote ---The DisplayPort output of the graphics card actually just detects the presence of the adapter and then changes its signaling to output HDMI signals instead. --- End quote --- It outputs HDMI signal, however voltages are wrong for HDMI, hence level shifter is needed. --- End quote --- Ah! I’d never heard that the adapters contain level shifters. Why would the higher resolution require it to be an active converter? (I use the terminology that it’s an “adapter” if it’s passive, “converter” for a device that actually converts from one signal type to another.) |
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