4k 60 problems

  • I've been able to get nowhere trying to get 4k sources to work

    I purchased a new 4k 60fps cable.

    I've plugged it in closest to the power intake.

    When I try to run a 4k source the tv goes black.

    Which according to Google results means the cable doesn't support 4k 60. That can't be right. I know it does.

    Anyone can hell help please. I'm lost.

  • Worth being aware of the various flavours of 4K/UHD at 50Hz and above.

    Some displays and/or AVRs will only accept the lower bandwidth 4:2:0 chroma-subsampling format that can be used for 2160p50/59.94/60 output - or need 4:2:2 support to be explicitly enabled.

    Some displays only accept 4:2:2 on certain HDMI inputs (my Sony is 4:2:0-only on HDMI 1 and HDMI 4, but accepts 4:2:0 and 4:2:2 2160p50-60 on HDMI 2 and 3 IF I enabled 'Enhanced HDMI support')

    The Pi 4B will only output RGB/4:4:4/4:2:2 and WON'T output 4:2:0. If you have a 4:2:0-only display, or are using a 4:2:0-only input, or are using an AVR or TV that requires 4:2:2 2160p50-60 support to be explicitly enabled and you haven't - you could have issues.

    (4:2:0 was a kludge added to the HDMI 2.0 spec to allow 2160p50-60 support over HDMI 1.4 bandwidth connections)

    Also NB 4:2:0 is only used at 2160p50 and higher - it's not used for 2160p30 and lower.

    Edited once, last by noggin (July 9, 2022 at 11:12 AM).