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21:9 content appears as 'stretch nonlinear'

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Re: 21:9 content appears as 'stretch nonlinear' #21 Trial

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Posted 6 August 2020 - 11:02

Hi,

DVB only distinguishes between 4:3 and 16:9 there is no official image format for 21:9. This is the reason 21:9 movies are distributed with black bars on top and bottom. If you TV does not have the correct picture setting it stretches the image. What model of TV do you use? The picture setting 16:9 does not necessarily that it is without any kind of stretching. Samsung is (was?) one of these candidates with misleading names.

 

Ralf



Re: 21:9 content appears as 'stretch nonlinear' #22 patrikcoc

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Posted 6 August 2020 - 11:05

It's an LG OLED55B9. But it's not the TV that's cutting, it's the box itself (since the small preview has the cut too). The TV has the aspect ratio set to original, with overscan turned off.



Re: 21:9 content appears as 'stretch nonlinear' #23 patrikcoc

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Posted 6 August 2020 - 11:09

Hi,

DVB only distinguishes between 4:3 and 16:9 there is no official image format for 21:9. This is the reason 21:9 movies are distributed with black bars on top and bottom. If you TV does not have the correct picture setting it stretches the image. What model of TV do you use? The picture setting 16:9 does not necessarily that it is without any kind of stretching. Samsung is (was?) one of these candidates with misleading names.

 

Ralf

 

Good to know! However that movie on the last video (which has logo cut) supposed to be 16:9, without black bars. And it's correct if i watch from PC m3u8 that I downloaded using OpenWebif.



Re: 21:9 content appears as 'stretch nonlinear' #24 ims

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Posted 6 August 2020 - 11:49

Broadcast is always 16:9 ... 1920 x 1080 px. If movie is in 21:9, it means, that picture is placed to this same 1920 x 1080 matrix, but 1920 x 882px only => top/bottom are black strips - but never will be cropped logo. 

 

Your TV is 4k. Do you have box set in 2160 or 1080 ? Did you try change it between 1080 <-> 2160 when are problems ?


Edited by ims, 6 August 2020 - 11:50.

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Re: 21:9 content appears as 'stretch nonlinear' #25 patrikcoc

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Posted 6 August 2020 - 11:54

Broadcast is always 16:9 ... 1920 x 1080 px. If movie is in 21:9, it means, that picture is placed to this same 1920 x 1080 matrix, but 1920 x 882px only => top/bottom are black strips - but never will be cropped logo. 

 

Your TV is 4k. Do you have box set in 2160 or 1080 ? Did you try change it between 1080 <-> 2160 when are problems ?

 

Yes I tried both 2160 and 1080 (normally I use my box on 2160) but the issue is still there, even on an external monitor. So far I noticed 3 types of this issue:

 

1. "21:9" movie stretched -> that can be fixed by switching >16:9 image setting in the box from letterbox to something else, then back to letterbox. This fixes the issue 100% for some time.

2. 16:9 movie stretched (half of the logo is out of the TV) - Found no way to fix it, other than wait for the movie to end... Or switch to the SD version / CZE version of HBO HD.

3. 16:9 movie top and bottom black bars (half of the logo is HIDDEN by the black bar) - Found no way to fix it, other than wait for the movie to end... Or switch to the SD version / CZE version of HBO HD. Here is a video when it changes from the incorrect black bars to the correct aspect ratio, just look at the logo: https://streamable.com/ls0wli )


Edited by patrikcoc, 6 August 2020 - 11:58.


Re: 21:9 content appears as 'stretch nonlinear' #26 WanWizard

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Posted 6 August 2020 - 11:59

Is that the same HBO HD that is on 23.5?


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Re: 21:9 content appears as 'stretch nonlinear' #27 patrikcoc

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Posted 6 August 2020 - 12:07

Is that the same HBO HD that is on 23.5?

 

I have access only to 0.8W but according to kingofsat, the 23.5 one is the CZE variant, not the hungarian one (they are not the same).



Re: 21:9 content appears as 'stretch nonlinear' #28 Trial

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Posted 6 August 2020 - 12:24

Hi,

afaik on LG the aspect/ratio settings which should be used is "just scan" as all others are scaling/shifting the original picture more or less. Do you have just scan selected?

 

Ralf



Re: 21:9 content appears as 'stretch nonlinear' #29 patrikcoc

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Posted 6 August 2020 - 12:25

Hi,

afaik on LG the aspect/ratio settings which should be used is "just scan" as all others are scaling/shifting the original picture more or less. Do you have just scan selected?

 

Ralf

 

Hi, yes. Aspect Ratio set to Original, Just Scan is On so that there is no scaling / overscan. Just the original image.



Re: 21:9 content appears as 'stretch nonlinear' #30 littlesat

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Posted 6 August 2020 - 12:30

I thing just scan is something that should be off

Edited by littlesat, 6 August 2020 - 12:30.

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Re: 21:9 content appears as 'stretch nonlinear' #31 WanWizard

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Posted 6 August 2020 - 12:32

On the screenshot above, it shows the framebufffer overlaying the wrong image format, so, like the TS, I don't see this being caused by the TV. If so, the framebuffer (GUI) would be affected too.


Currently in use: VU+Duo 4K (2xFBC S2), Amiko Viper T2C (T2+fallback), Octagon SF8008 (S2+T2), Zgemma H9.2H (T2+fallback)

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Re: 21:9 content appears as 'stretch nonlinear' #32 patrikcoc

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Posted 6 August 2020 - 12:32

I thing just scan is something that should be off

 

According to Rtings: "In the 'Aspect Ratio Settings' tab, we selected the 'Original' 'Aspect Ratio' with the 'Just Scan' option set to 'On' so that our HDMI input would be automatically matched to the screen without needing to change the 'overscan' setting from the source output setting."

 

Anyway, the issue persist even if i turn it on or off, or if i set the aspect ratio to Original or 16:9. It's just that with Just Scan off, image is a bit zoomed in (overscan).



Re: 21:9 content appears as 'stretch nonlinear' #33 patrikcoc

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Posted 6 August 2020 - 12:34

On the screenshot above, it shows the framebufffer overlaying the wrong image format, so, like the TS, I don't see this being caused by the TV. If so, the framebuffer (GUI) would be affected too.

 

That is what i also believe. Plus this channel is perfectly fine on a trash Amiko MicroHD SE on the same TV.



Re: 21:9 content appears as 'stretch nonlinear' #34 ims

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Posted 6 August 2020 - 12:42

Yes , HBO HD 0.8W (11843V, 11977H) and 23.5E (12090V) has same events. But 11843V has little diferent video header.


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Re: 21:9 content appears as 'stretch nonlinear' #35 ims

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Posted 6 August 2020 - 12:44

On the screenshot above, it shows the framebufffer overlaying the wrong image format, so, like the TS, I don't see this being caused by the TV. If so, the framebuffer (GUI) would be affected too.

Yes, there is cropped PiG too. I think, drivers + provider can sometimes be a murderous combination ;) .


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Re: 21:9 content appears as 'stretch nonlinear' #36 WTE

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Posted 6 August 2020 - 17:40

Is it possible to record the channel when an 21:9 window is broadcast as 16:9. Like with wetranfer you can upload it and give the download url.

By playback the record the effect can been reproduced.

 

As far as I know the option bestfit should remove the black banners so you get full screen with the logo in the screen.

The picture I see seems zoom2 which is not common on STB which just enlarge everything so like logo comes out the screen.


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Re: 21:9 content appears as 'stretch nonlinear' #37 mrvica

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Posted 6 August 2020 - 20:59

on HD channels those settings in Audio / Video have no effect, what is more annoying on HD channels is stretched 4:3, it looks terrible

https://forums.steve...ovision.135428/



Re: 21:9 content appears as 'stretch nonlinear' #38 patrikcoc

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Posted 6 August 2020 - 22:26

Is it possible to record the channel when an 21:9 window is broadcast as 16:9. Like with wetranfer you can upload it and give the download url.

By playback the record the effect can been reproduced.

 

As far as I know the option bestfit should remove the black banners so you get full screen with the logo in the screen.

The picture I see seems zoom2 which is not common on STB which just enlarge everything so like logo comes out the screen.

 

 

No matter what kind of TV i have connected with any settings, that channel will have this issue commonly. On recording and OpenWebif, it's fine. Right now there is a 16:9 movie playing, but with black bars at the top and bottom, hiding the half of the logo.



Re: 21:9 content appears as 'stretch nonlinear' #39 patrikcoc

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Posted 13 August 2020 - 22:48

Update: It seems to happen with 4:3 content too. 

 

Here's how it looks on my TV: TROxFOC.jpg

 

Here's how it looks in Webif: L0DnVXE.jpg


Edited by patrikcoc, 13 August 2020 - 22:48.


Re: 21:9 content appears as 'stretch nonlinear' #40 ims

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Posted 13 August 2020 - 23:32

In all cases - change formats is no needed. I have FullHD TV only, but I am using 4:3 pillarbox, 16:9 letterbox and on TV I am using "Not recalculated". I never changing v-mode.

 

Did not tried you change some in 3D ? As I saw on Vu Duo4k, there is possible set picture over whole screen, but it is partialy cropped. And turning off not helps sometimes (restart only). Or some plugin for set picture ?


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