Posts by jd17

As was pointed out in the beginning of this thread - many things have changed when going from the old Kodi video player in Jarvis to the new Krypton video player.
This is a Krypton-specific issue, so I think AMLogic is not to blame...

Quote from meijjaa

...the 1080p30 sample gives flickering boxes and comparable to VLC with deinterlacing forced. The 1080i60 sample shows bad Chroma upsampling again because deinterlacing is active again.
[...]
It does look a bit strange that progressive content is processed by default.

That sounds to me like you figured out the root cause.

The conclusions I would draw from that:

a) Stop forcing Deinterlace on (all) P content.
b) Improve Deinterlacing (quality) for I content.
c) Find reason for VC-1 issues with deactivated Deinterlace.

Did I get this right?

Quote from meijjaa

But it doesn't fix 1080p30, deinterlacing is forced on anyway causing flickers and Chroma error is visible.

Maybe I am misreading this, but are you saying that a forced deinterlace is responsible for the bad PQ, if the bypass command is not used?
Or does this just apply to 1080p30?

Quote

But 2160p 4:2:0 gives a slightly smoother color ramp, what to choose...

I find the LG's upscaling from 1080p to 2160p considerably better than the box's...

Quote from jant90

Could you elaborate on that please? Do I need to make a custom hotkey for that?

Sure...
The way I do it might be complicated, but I don't know how else to do it since I don't have a keyboard attached/connected to the box.

1. Download the addon "Keymap Editor"
2. Assign whatever key you like to "CodecInfo" (/Global/Other)
3. Go to /userdata/keymaps/
4. Rename "codecinfo" in gen.xml to "PlayerDebug" and save.

Quote from jant90

It's frustrating that the codec info overlay (O button) is so limited so it's hard to know what's going on in terms of caching, refresh rate matching / av syncing and frame dropping/skipping.

Rename CodecInfo to PlayerDebug and you'll be able to see dropped and skipped frames.

Quote from r4w

ssarava9  jd17: If you can try to mount NFS as I did and report to me your results, it would be interesting to understand what's your max video bitrate that your box can sustain.

I finally tried this and the result is truly remarkable!

My box's LAN is apparently not bad -> it runs the Sony Camp smoothly with a regular NFS share.
However the bird90 video stutters horribly via regular NFS share.

That same bird90 video runs absolutely smooth when played from the mount location!

So I stick with my initial opinion:

Quote

You should pitch this to the Kodi devs, wouldn't all platforms benefit from this?
Eventually the devs could change the way we add network sources right now to always be mounted your way.

I did not try the 120mbit video since the LAN is only 100mbit...

Quote from meijjaa

But what do you actually mean by bad quality? Do you have a lot of color banding?

It's best to just compare and see for yourself.

Look at the Spears&Munsil pattern, especially the top circles and diagonals.

Then run one of either commands...

Quote

echo 1 > /sys/module/di/parameters/bypass_prog
or
echo 1 > /sys/module/di/parameters/bypass_all

...and look again.

I see the effect everywhere, but especially in upscaled (SD or 720p) content.

I would like to give it a shot.
The Spears&Munsil test pattern is in 23.976p.
I assume a refresh rate switch overwrites those kinds of commands?

Quote from meijjaa

e.g.
echo 2160p50hz420 > /sys/class/display/mode
echo 2160p50hz422 > /sys/class/display/mode
echo 1080p50hz444 > /sys/class/display/mode (yCbCr 4:4:4 unsupported at 2160p 50hz)

Can I fix the GUI to 23.976Hz and run the command...

echo 1080p23.976hz420 > /sys/class/display/mode

Or is the command for this refresh rate different? Maybe 23.98Hz or 23.9Hz...?
[hr]
I just disabled refresh rate switching and tested the following:

Quote

echo 1080p60hz420 > /sys/class/display/mode (TV does not accept signal)
echo 1080p60hz422 > /sys/class/display/mode (TV does not accept signal)
echo 1080p60hz444 > /sys/class/display/mode (standard)

echo 2160p60hz420 > /sys/class/display/mode (standard, looks worse than 1080p, probably due to inferior S905 upscaling)
echo 2160p60hz422 > /sys/class/display/mode (looks worse than 2160p60hz420, also seems fragile, signal comes on and off)

Conclusion:
Nothing to gain here. The standard modes are already ideal.

It was my information that 1080p is always output as YCbCr 444 while 2160p is output as YCbCr 420.

I have the box set to 1080p60 (+ refresh rate switching) so the majority of upscaling is done by the TV.

The title and my initial post might be confusing, but we must not mix upscaling of a low resolution to a high resolution and chroma upsampling. Those are very different things.

Quote from meijjaa

For me letting the TV do the up sampling looks good for 1080i 25fps content (2160p50hz420). But as always, ***** in = ***** out

That rule hardly applies here.
A reference Blu-ray remux suffers just as much from bad chroma upsampling as a low bitrate encode.

There is nothing the TV can do about it, but I believe you are talking about resolution upscaling again...

I edited title and initial post to avoid confusion.

So there is hope that this might be fixed?

Is it normal for the S905(X) to do some overscan at the left edge?

I have a Mini M8S II 2GB/16GB (S905X) and in both Jarvis and Krypton I don't see the white line on the left:

NMOUso6.jpg

Raspberry Pi 2 in comparison:

JtXpTrs.jpg

Pattern is part of the AVS HD 709 basic settings:
AVS HD 709 - Blu-ray & MP4 Calibration - AVS Forum | Home Theater Discussions And Reviews

Can you guys check if you have that overscan too?
Is this a known thing? Can it be changed? Ideally I would like to have no overscan whatsoever...

Thank you Gendo.

This does the trick, PQ is on the same level as Jarvis since I entered this command.

99% of my content is Progressive so this is a great solution for me...
However I assume that I might be a minority in that regard...?

I hope this helps kszaq to tackle the root cause?

I understand.
With a bit more distance to a maybe smaller TV I can see how the issue might not be very obvious - especially if there is no direct comparison to Jarvis or another device.
However watching SD or 720p content I can move far away from my 65" and still see the problem.

At my regular 3m distance to the 65", it is unacceptable to me, no matter which resolution.
But I am patient and Jarvis works perfectly, so I will just do whatever I can to help resolve the issue.

That is interesting.
It makes me wonder why so few people are moaning about this...

Quote from mmpp

I only own S905 devices (see signature), so the chroma upscaling issue is present on both 905 and 905X.

Do you have the chroma upsampling issue with the build from Raybuntu (official LibreELEC?) on your Wetek Hub as well?

I do not see any change, so still the same.

Did I do this right?
I did not get any kind of feedback from Putty....

cnja4eq.png

Sorry if this is a dumb question, but where do I enter those code lines?
SSH via root?
advancedsettings.xml?
Something else?

Root cause is apparently bad chroma upsampling.
Upscaled content makes that just more obvious, but 1080p suffers from bad picture quality as well.

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