Spears & Munsil 4K UHD HDR Benchmark (Test Discs) May 15, 2023

[Oniiz86]

Originally Posted by Stacey Spears

David and I are actually trying to see if we can work around the Dolby Vision issue when switching to HDR10 and back. We found one case where it does reset. The behavior may change once we actually have the menu in place with proper background videos. Should know more in a couple of weeks.

Hey Stacey, any progress with getting around the OPPO bug which I believe you said had difficulty switching from Dolby Vision to HDR10 but in some instances it would reset correctly if you let the patterns loop?

[Stacey Spears]

Originally Posted by Oniiz86

Hey Stacey, any progress with getting around the OPPO bug which I believe you said had difficulty switching from Dolby Vision to HDR10 but in some instances it would reset correctly if you let the patterns loop?

Have not gotten that far yet. The issue may go away when we get a real disc build where it has an actual menu to go to and from. We will certainly test for it once we start getting builds with menus to test.

The disc defaults to Dolby Vision, so it is fine by default. The issue only occurred when you switched From Dolby Vision to HDR10 and back. If it is still present, once we have official builds, we will document it and show people how to work around it.

Thank you for reminding me.

[Stacey Spears]

Hey, its back! Just wanted to provide an update.

1. Disc 2 is 99.9% encoded. Just waiting on the AE project to be finished for the 7 Atmos panning clips. Hoping to have that this weekend so I can render and and encode them.
2. Trying to nail down the encoder settings for disc 3. Having a difficult time encoding the HD resolution montage. It looks worse than the UHD versions (compression artifacts) and i am using the same settings / bitrate as UHD. x265 is just not performing well with HD. A friend is trying a couple of different BD encoders for me to see how they perform.
3. We need to finish the beginners guide so we can get it formatted for printing.
4. Need to get the cover and disc art created.
5. Pick the level of the LFE for the montage music. A few versions have been shared and waiting on feedback.
6. And of course, the biggie, testing all of it once they are authored.

[PeterTHX]

The HD 1080p footage can't be AVC encoded? Has to be HEVC?

[SeeMoreDigital]

Originally Posted by PeterTHX

The HD 1080p footage can't be AVC encoded? Has to be HEVC?

AVC can be encoded as progressive or interlaced. And contrary to popular belief, so can HEVC...

[Stacey Spears]

Originally Posted by PeterTHX

The HD 1080p footage can't be AVC encoded? Has to be HEVC?

The bitrate for AVC on UHD BD is pretty low. Not sure it supports HDR either. Need to check on that.

Here is one issue with the HD encode:


This occurs on two shots. Then several other shots has keyframe pulsing.

[Stacey Spears]

Let me take a quick poll.

Do you want the up arrow to show pop-up help or the nit menu? Then the down arrow will do the other.

As of today, the up-arrow shows the format / nit menu. The down arrow shows the help.

The 1st and 2nd edition used the up arrow for help. There was no format menu. The UHD edition used the up arrow for the format / nit menu because there was no help.

[Staying Salty]

Originally Posted by Stacey Spears

Let me take a quick poll.

Do you want the up arrow to show pop-up help?

.

[Staying Salty]

Originally Posted by Stacey Spears

Let me take a quick poll.

Do you want the up arrow to show the pop-up nit menu?

.

[PeterTHX]

As of today, the up-arrow shows the format / nit menu. The down arrow shows the help.

Sounds good to me.

[Sledgehamma]

Originally Posted by Stacey Spears

Would everyone mind providing their top 5 list of patterns they would like to see a video explaining? I am sure in the end, it is all of them, but for now, trying to figure out which videos we should make first.

For me the most important one is the color space evaluation pattern. There is just sooo much going on there and while you provide a great article on your website I'd still like a video explaining it in more detail.

For example you write:

"These boxes test whether the Y’CbCr channels are getting clipped at the reference high / low levels before being converted to RGB. This is always wrong; clipping should always be done as late as possible in the display pipeline, and certainly only in RGB."

I'd love to know why exactly this is wrong. But maybe this is way too detailed for such videos.

Originally Posted by Stacey Spears

Let me take a quick poll.

Do you want the up arrow to show pop-up help or the nit menu? Then the down arrow will do the other.

As of today, the up-arrow shows the format / nit menu. The down arrow shows the help.

The 1st and 2nd edition used the up arrow for help. There was no format menu. The UHD edition used the up arrow for the format / nit menu because there was no help.

up -> nit menu
down -> help

[Wendell R. Breland]

Originally Posted by Stacey Spears

As of today, the up-arrow shows the format / nit menu. The down arrow shows the help.

Works for me.

[David M]

Originally Posted by SeeMoreDigital

AVC can be encoded as progressive or interlaced. And contrary to popular belief, so can HEVC...

Not on UHD BD. UHD BD removes all interlaced formats.

Originally Posted by PeterTHX

The HD 1080p footage can't be AVC encoded? Has to be HEVC?

UHD BD lets you re-use BD-style 1080p AVC encodes, but only within Blu-ray spec (40mbps max, as Stacey mentioned).

[Penton-Man]

Originally Posted by Stacey Spears

Let me take a quick poll....
As of today, the up-arrow shows the format / nit menu. The down arrow shows the help.

I would prefer that ^ , but could roll either way. B.T.W. Stacey, from your time on reduser, Tom L. finally was able to get his 4K HDR project distributed to the public. I fear so much time has elapsed since it was finished that even some admirers of his work have become disinterested. Not even sure if the RED forum made note of its April release

[SeeMoreDigital]

Originally Posted by David M

Not on UHD BD. UHD BD removes all interlaced formats.

Indeed... The UHD disc specification does not but the HEVC video format permits interlaced video.

[Keenan]

Originally Posted by Stacey Spears

Let me take a quick poll.

Do you want the up arrow to show pop-up help or the nit menu? Then the down arrow will do the other.

As of today, the up-arrow shows the format / nit menu. The down arrow shows the help.

The 1st and 2nd edition used the up arrow for help. There was no format menu. The UHD edition used the up arrow for the format / nit menu because there was no help.

Down for Help sounds good to me.

[Stacey Spears]

Thank you all for the feedback.

[Stacey Spears]

Originally Posted by Sledgehamma

For example you write:

"These boxes test whether the Y’CbCr channels are getting clipped at the reference high / low levels before being converted to RGB. This is always wrong; clipping should always be done as late as possible in the display pipeline, and certainly only in RGB."

I'd love to know why exactly this is wrong. But maybe this is way too detailed for such videos.

I am assuming you are asking why the clipping should occur in RGB vs. YCbCr. Our SDR clipping pattern has black concentric boxes on the bottom right. Y is < 64 in YCbCr. In RGB, all the values are > 64. If you clip in YCbCr, you will have flat black. If you clip in RGB, you will still have all the detail. That pattern was created because we saw this happen.

On the flip side the RGB boxes are all within 64-940 (960 for chroma) in YCbCr. in RGB, they are all >940. That is to show why you should not clip in RGB either.

We are saying don't clip, but if you have to, do it after conversion to RGB.

Yes, we can do a video that goes into more detail on the Color Space Evaluation pattern. Thank you for requesting it.

[Stacey Spears]

Originally Posted by Penton-Man

I would prefer that ^ , but could roll either way. B.T.W. Stacey, from your time on reduser, Tom L. finally was able to get his 4K HDR project distributed to the public. I fear so much time has elapsed since it was finished that even some admirers of his work have become disinterested. Not even sure if the RED forum made note of its April release

Jarred does not post a lot anymore on the forum, which is probably why it was not mentioned. Do you have a link to it? I would like to see it.

[Penton-Man]

Originally Posted by Stacey Spears

Jarred does not post a lot anymore on the forum, which is probably why it was not mentioned. Do you have a link to it? I would like to see it.

here - https://awaken.watchdust.com/site?co...-states#athome
a review - https://www.space.com/awaken-4k-docu...-dust-premiere
a couple years back he did a 300 nit grade from a 1000 nit master for a cinema LED screen, but as I recall it was only shown at a couple demos – never widely distributed