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Auto frame rate switching & dynamic range matching - 4K (HDR10) capable Hardware
(2018-02-19, 20:35)hdmkv Wrote: So, best I can get is 8-bit 444 HDR Rec2020 w/LibreELEC it seems. More I compare w/Shield & Zidoo X9S, the more it looks very similar. Not seeing the banding @noggin noted w/4K HDR 23.976 movies, nor the dithering others have. But, unable to do a direc A/B, so hard to be sure either way. 

Your projector's EDID shows a maximum pixel clock frequency of 300 MHz. This means that it will only support 4K 50/60 4:2:0 8-bit, 4K 24/25/30 4:4:4 8-bit or 4K 24/25/30 4:2:2 upto 12-bit.

This table is wrong or at the least misleading: https://epson.com/faq/SPT_V11H713020~faq...plhc5040ub?

What this means is that you can only use 10/12-bit 4:2:2 for 4K 24/25/30Hz HDR content.
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(2018-02-19, 08:27)wrxtasy Wrote: Yes I can confirm i've seen that. We might need to get @JohnGalt back on the case unless @Sam.Nazarko bug busts the AML Linux Nougat Kernel first. Wink 
This is actually a simple fix. It is just that the AVI InfoFrame Data Byte 1 is set incorrectly for YCbCr 4:2:2. It should be 0x30 (00110000) for 4:2:2, but is set to 0x50 (01010000) which is for 4:4:4 pixel encoding. If you have a HDFury Vertex/Integral you can send a corrected AVI InfoFrame and you will get a normal picture without the green tint. The first 3 digits in the binary is for pixel encoding.
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Thx. @wesk05, sent this issue upstream to the LE AML Linux Kernel Gurus to bug bust. Wink

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(2018-02-20, 06:34)wrxtasy Wrote: Thx. @wesk05, sent this issue upstream to the LE AML Linux Kernel Gurus to bug bust. Wink
 I think there is something wrong in this section: https://github.com/LibreELEC-AML/linux-a...deo.c#L518 It is the same for HDMI 1.4
Edit: That section looks right to me. It must be some where else.
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(2017-12-18, 18:23)jaymillerSR Wrote: @wrxtasy does ATV4k kodi support Siri to text instead of keyboard typing? Kinda like the shield does with spmc?
 yes it does
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(2018-02-20, 06:18)wesk05 Wrote:
(2018-02-19, 20:35)hdmkv Wrote: So, best I can get is 8-bit 444 HDR Rec2020 w/LibreELEC it seems. More I compare w/Shield & Zidoo X9S, the more it looks very similar. Not seeing the banding @noggin noted w/4K HDR 23.976 movies, nor the dithering others have. But, unable to do a direc A/B, so hard to be sure either way. 

Your projector's EDID shows a maximum pixel clock frequency of 300 MHz. This means that it will only support 4K 50/60 4:2:0 8-bit, 4K 24/25/30 4:4:4 8-bit or 4K 24/25/30 4:2:2 upto 12-bit.

This table is wrong or at the least misleading: https://epson.com/faq/SPT_V11H713020~faq...plhc5040ub?

What this means is that you can only use 10/12-bit 4:2:2 for 4K 24/25/30Hz HDR content. 
 Thanks, except I get green-tinted UI and green-tinted playback w/10- and 12-bit 4:2:2.
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(2018-02-21, 01:57)hdmkv Wrote:  Thanks, except I get green-tinted UI and green-tinted playback w/10- and 12-bit 4:2:2. 
As it is now, you can't use the 4:2:2 mode with Amlogic LE. It looks to be a simple fix and hopefully one of the LE AML Linux kernel Gurus will fix the code soon.
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@wesk05, I've had a look at the current AML Nougat Kernel we are using in alpha - LE Kodi Leia, here is the equivalent section:

https://github.com/LibreELEC/linux-amlog...deo.c#L903

Not seeing the green tinted playback using an AML S912 when setting 422,10bit or 422,12bit and playing back 23.976 4K HEVC.

Uploading a S912 Kodi Leia test .tar update for @hdmkv to test as well.



@hdmkv, Suggest to do a LE settings .tar backup, and then copy this into the Update folder and reboot:
(there will be bugs, especially getting Hardware decoding to work reliably - it's Alpha Kodi software.)

LibreELEC-S912.arm-9.0-devel-20180221102512-r1-g28f08d0.img.gz

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(2018-02-21, 05:45)wrxtasy Wrote: @wesk05, I've had a look at the current AML Nougat Kernel we are using in alpha - LE Kodi Leia, here is the equivalent section:

https://github.com/LibreELEC/linux-amlog...deo.c#L903

Not seeing the green tinted playback using an AML S912 when setting 422,10bit or 422,12bit and playing back 23.976 4K HEVC.

Uploading a S912 Kodi Leia test .tar update for @hdmkv to test as well.
I had looked at that section again and it looked right to me. There doesn't seem to be any difference in the "hdmi_tx_construct_avi_packet" section.

I did check the build you uploaded and can confirm that there is no green tint with YCbCr 4:2:2 mode and that the AVI InfoFrame is also correct for YCbCr 4:2:2 pixel encoding. This build for whatever reason defaults to 422 even for 4K 60. When I set the mode to 420 with the echo command I got a no video situation when playing a 4K23.976 clip.
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(2018-02-21, 07:54)wesk05 Wrote: This build for whatever reason defaults to 422 even for 4K 60.
Yes you are right, the default straight after bootup is 422,8bit for 1080p.

Any benefit/disadvantage to letting the media player upsample to 4:2:2 vs the TV ?

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(2018-02-21, 09:15)wrxtasy Wrote:
(2018-02-21, 07:54)wesk05 Wrote: This build for whatever reason defaults to 422 even for 4K 60.
Yes you are right, the default straight after bootup is 422,8bit for 1080p.

Any benefit/disadvantage to letting the media player upsample to 4:2:2 vs the TV ?  
  
If you have one of the TVs that only supports 4:2:0 at 2160/50p and 2160/59.94 or 60p (the old 'HDMI 2.0 over HDMI 1.4' hardware addition to the HDMI 2.0 spec) does the current LE code switch to 4:2:0 8bit if you select 2160/50p or 2160/59.94p (or does it ignore 2160/50p and 2160/59.94 and 60p modes and not offer them and instead only offer the 4:2:2 compatible 2160/30p and below modes)?
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(2018-02-21, 05:45)wrxtasy Wrote: Uploading a S912 Kodi Leia test .tar update for @hdmkv to test as well.


@hdmkv, Suggest to do a LE settings .tar backup, and then copy this into the Update folder and reboot:
(there will be bugs, especially getting Hardware decoding to work reliably - it's Alpha Kodi software.)

LibreELEC-S912.arm-9.0-devel-20180221102512-r1-g28f08d0.img.gz 
Thanks, just tested w/your build and SSH'ing echo '422,12bit' > /sys/class/amhdmitx/amhdmitx0/attr ... I get 12-bit 422 Rec2020 HDR as expected, great, but 23.976 renders at 29.97, same as my Kodi/LE UI setting... getting close though, encouraging!
See my next post, working great.
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(2018-02-22, 02:43)hdmkv Wrote: Thanks, just tested w/your build and SSH'ing echo '422,12bit' > /sys/class/amhdmitx/amhdmitx0/attr ... I get 12-bit 422 Rec2020 HDR as expected, great, but 23.976 renders at 29.97, same as my Kodi/LE UI setting... getting close though, encouraging! 
Did you check "Adjust refresh rate"? It is off by default in this build.
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Didn't as I assumed the .tar update would keep my existing settings. Thanks, it was off. enabled it and viola!... nice work @wrxtasy!!!

This one is with echo '422,12bit' > /sys/class/amhdmitx/amhdmitx0/attr
Image

And this one is with echo '422,10bit' > /sys/class/amhdmitx/amhdmitx0/attr
Image

So, both render equally well!
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Cheers @hdmkv
Nice to see AMLogic have continually improved the Linux Kernel. It's a team effort from the AML LE boys, @codesnake did nearly all the hard work updating the Kernel master code.

I've also been compiling a slightly modded S912 - @kszaq's sourced LE 8.2.x Kodi Krypton with the new AML LE Kernel plugged into it, it's a more stable vs alpha Kodi Leia and no green tinted 422,10/12bit 4K screens either !

You may need to extract a new .dtb if the box does not boot, found in the included device_tree folder.

Kodi Krypton - LibreELEC-S912.arm-8.2.3.img.gz

Tips and further discussion over on the AML S912 LE Subforum (click)

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