I’ve recently upgraded my TV to finally have 4k and enjoy Vero to the fullest. The signal path is Vero 4k+ to HDMI: Media Player on Denon 2400 to HDMI 3 on Sony 75X950G.
The cable from Vero is the original Vero cable and cable connecting to TV is Monoprice 2 meter premium certified HDMI.
Everything looks amazing coming from 7 years old edge-lit Samsung but one specific content seems to cause issues: 4k SDR 50 Hz with PCM multi-channel audio. There are “HDMI signal dropouts” where the TV loses the signal (goes black for a moment, sometimes with signal lost error from TV) and sometimes the audio indicator on the AVR screen blinks off at the same time. Usually though the audio is heard while the video is gone.
It should be noted that the Vero would not show any picture at all unless I enabled “Force 4:2:2” setting in Vero after setting the TV “HDMI format” to “Enhanced” (this enables HDR and HDMI 2.0 in general to my knowledge).
Video processing on the AVR is disabled except for overlays.
I suspect that the problem happens with this content because it is the only really high-bandwidth content I have. I don’t have other high-fps content but will try to find some other 50 or 60 fps content.
Does that sound reasonable? With the “Force 422”, 4k and 50 Hz I believe the bandwidth is at the higher end of the 18 Gps maximum signal rate? This content should not need 4:2:2 chroma subsampling which increases the bandwidth need higher than required but there is no picture without forcing 422 for everything.
It is a shame that Vero needs to force 4:2:2 chroma subsampling and while I do understand what it does, I do not understand why it is needed. Especially a shame if I will find out that all higher-fps content is unplayable.
When setting up the system I did play around with the different control files at /sys/class/amhdmitx0 and looked at forum threads here around forced 4:2:2 but eventually gave up and just enabled the forced setting.
What is the reason for requiring “forced 4:2:2” on some TV sets?
I do not have the possibility to debug it until the next week but wanted to ask about opinions of the clever people here.
Obviously I will test with debug log, change cables, try to connect Vero directly to the TV, and so on next week when it doesn’t disturb the peace at home It already caused a disappointment that the planned watching did not happen so I can’t make the situation worse by starting to debug the system at the living room…