How to confirm 4k 10 bit material etc. is being displayed correctly?


#1

Hi, I’ve seen a lot of emails about the 4k colorspace and 4:4:4 etc, and 10 bit files and may be confusing a number of topics/terms.

Is most of that automatic in OSMC on the Vero4k if we have the Adjust Refresh rate set and a compatible display device?

I downloaded the 140 Mbps Jellyfish File (http://jell.yfish.us/media/jellyfish-140-mbps-4k-uhd-hevc-10bit.mkv) and while it ran fine, except for a hiccup each time it starts, the Technical info screen shows 8 bit…should it not say 10 bit?

Not sure if I’m looking in the wrong place and getting mixed up.

I have a Sony XBR75X900E & Denon AVR-X2300W

Adjust Refresh rate is set to Always, and gui is at 1080p

/media$ cat /sys/class/amhdmitx/amhdmitx0/edid

Rx Brand Name: DON
Rx Product Name: DENON-AVR
Manufacture Week: 0
Manufacture Year: 2016
Physical size(cm): 166 x 93
EDID Version: 1.3
EDID block number: 0x1
blk0 chksum: 0x47
Source Physical Address[a.b.c.d]: 3.5.0.0
YCC support 0x03, VIC (native 255):
ColorDeepSupport 0xb8 10/12/16/Y444 1/1/0/1
97 96 93 94 95 98 31 16 20 5 19 4 32 34 60 62 18 22 3 7 17 21 2 6 1 101 102 14 35 15 36 95 94 93 98 353 352 357 358 
Audio {format, channel, freq, cce}
{1, 7, 0x7f, 0x07}
{7, 5, 0x1e, 0x00}
{2, 5, 0x07, 0x00}
{11, 7, 0x7e, 0x03}
{10, 7, 0x06, 0x03}
{12, 7, 0x7e, 0x03}
{11, 7, 0x7e, 0x01}
Speaker Allocation: 0x5f
Vendor: 0xc03
MaxTMDSClock1 300 MHz
Vendor2: 0xd85dc4
MaxTMDSClock2 600 MHz
ColorMetry: 0xdf
SCDC: 1
RR_Cap: 0
LTE_340M_Scramble: 0
  HDR  DeepColor
checkvalue: 0x47fe0000

/media$ cat /sys/class/amhdmitx/amhdmitx0/disp_cap

480p60hz
576p50hz
720p60hz
1080i60hz
1080p60hz
720p50hz
1080i50hz
1080p30hz
1080p50hz
1080p24hz
2160p30hz
2160p25hz
2160p24hz
smpte24hz
smpte50hz
smpte60hz
smpte50hz420
smpte60hz420
2160p50hz
2160p60hz
2160p50hz420
2160p60hz420

#2

You can use the Denon AVR app and check the HDMI signal while the video is running. You can also do this in Denon’s setup menu under Settings -> Information -> Video.

This will also show you the current chroma subsampling mode.


#3

Thank you for that.
Will play with that tonight, much appreciated.

EDIT Remote app no longer compatible with my receiver and the Info menu doesn’t display much when playing the file. I’ll play around with a bit more tonight


#4

Vero plays everything at 10-bit if the display supports it. The only wrinkle is it may use 4:2:2 pixel format which some AVRs will report as 8-bit or ----- because they can’t work out the actual bit-depth.

My go-to test file is The World in HDR. If you see banding in the sky over the skateboarder a few seconds in, it’s probably an 8-bit signal.


#5

Great, thanks, Graham. I’ll give that a try tonight.


#6

I’ve been messing around with HDR on my Vero 4K with a test file. One odd thing is I can’t get my TV to click into HDR mode, unless while I’ve got the Vero 4K on, I turn HDMI UHD Color mode off, and then back on again. Then when I play the video file, the TV switches to HDR mode.

The info says that its playing in HDR10+ 10 bit YUV444 24Hz. I’ve not yet captured what mode its in when it’s not playing in HDR mode. But when it doesn’t play in HDR mode the colours all look too dark/over saturated.

I have a Samsung KS9000 (latest FW) and a Yamaha RX-A3070 (latest FW).


#7

I grabbed this and a few other files from that site and they play fine, if a bit of skipping at the beginning while it loads. So I guess I’m fine, but I’m still not sure where I can confirm the output on the Vero