[(Evan)]

Hey everyone. I have a Sony 65" 4K display on it's way (XBR-65X850A), and I have a question about how up-scaling works when I play Blu-rays and other video content from my PC. I have a brand new gaming computer with dual Nvidia 770 GTX cards, so outputting 3840 x 2160 resolution isn't a problem at all. But if the output resolution is set to 3840 x 2160 from the PC, does that mean that the graphics card will handle all the up-scaling when watching videos, or will my TV still receive the media's native format and do the up-scaling itself? Which would be better at up-scaling? I know the XBR marketing really boasts about it's up-scaling capabilities.


Thanks!

 

[fitbrit]

The best would be to try and see for yourself. If outputting 2160p from the HTPC, your TV will not use its scaler. If you output 1080p, the TV should.

Look at both.

Decide which you prefer.

 

[tman247]

Agreed, If the TV is receiving a 2160P signal, it shouldn't do any post-scaling. If it's receiving a 1080P signal, it will upscale it internally. I prefer to out the signal to the TV at it's native resolution, as any extra 'processing' can introduce unwanted artefacts.

 

[(Evan)]

The only problem with setting the PC to output 1080p for movies is that I would have to set it back to 2160p whenever I wanted to play games so that they're rendered in that resolution. Not that it's a huge difficulty to change the resolutions...but I was hoping there was a way to set the way it outputs certain sources separately.

 

[Fyodor]

You should try using both 1080p video card settings (TV receives 1080p and upscales) and 2160p settings (video card upscales and TV plays input) and see which looks better. Then tell us about your results! With 4K video capable devices and displays running ahead of content, it's something a lot of us will be interested in.

 

[fitbrit]



Quote:
Originally Posted by (Evan)  /t/1517698/playing-movies-on-4k-tv-from-htpc#post_24356403


The only problem with setting the PC to output 1080p for movies is that I would have to set it back to 2160p whenever I wanted to play games so that they're rendered in that resolution. Not that it's a huge difficulty to change the resolutions...but I was hoping there was a way to set the way it outputs certain sources separately.

Using programs like JRiver Media Center, and probably others, you can set up an automatic display settings changer. Therefore, 1080p (or any resolution) movies can be sent out as 1080p, and you can keep the default 2160p for the desktop and other apps. Most games should have a remembered preferred resloution to switch too as well.

 

[Foxbat121]

I can't imagine play any game at 30hz/30fps.

 

[(Evan)]



Quote:
Originally Posted by Foxbat121  /t/1517698/playing-movies-on-4k-tv-from-htpc#post_24358722


I can't imagine play any game at 30hz/30fps.

Why would I be playing games at 30fps?

 

[Foxbat121]

At 4k resolution, current HDMI spec limits to 30hz max. For watching movie, you probably NEED to set at 24hz.


HDMI 2.0 is coming to eliminate this limitation but not here yet. I read Sony TVs can do a firmware upgrade to HDMI 2.0 . But other devices will require new purchase to get HDMI 2.0.


Sent from my Nexus 5 using Tapatalk

 

[(Evan)]

Ok guys, I got the TV yesterday and I am having some huge issues.


1: The TV keeps reading the 1080p input from my computer as 4096×2160. For some reason this creates a lag of about .30 seconds for my mouse and for the audio on videos. Everything is out of sync. The only way to remedy this is to go to the NVIDIA control panel and switch back and forth between various resolutions...until it randomly starts working. When it shows 1080p as the input, the lag is gone. What could cause this? It resets back to 4096×2160 each time I turn off the TV or computer. Not something I can live with if it isn't fixable/


2. When I have the 3D setting turned on in the NVIDIA control panel, I get the same exact lag even though the TV is displaying 1080/24p. I have to set an audio delay in PowerDVD to .30 seconds in order for the audio to be in sync. Not even going to try 3D gaming.


Any idea what could be causing these issues? I'm about ready to send the set back.


Thanks

 

[Roussi]

You may want to test if first with a dedicated BRD player, a game console or a HTPC with AMD video.

 

[Mauricio Burac]


I Have a 4K SONY XBR -65X907A and I also have a HTPC with Windows 8.1.The AMD Radeon R7 260X it show the maximum resolution on my display (SONY XBR) is 3840x2160 but if I want to change the resolution the maximum is 1080p .The TV is upgraded already with the new firmware so is able to accept HDMI 2.0 so my only guest is that the graphic card is not ready for HDMI 2.0 or either my HDMI cables

 

[jhughy2010]



Quote:
Originally Posted by tman247  /t/1517698/playing-movies-on-4k-tv-from-htpc#post_24355760


Agreed, If the TV is receiving a 2160P signal, it shouldn't do any post-scaling. If it's receiving a 1080P signal, it will upscale it internally. I prefer to out the signal to the TV at it's native resolution, as any extra 'processing' can introduce unwanted artefacts.

Agreed.  However, since OP is using TV as a native display for his HTPC I would only set HTPC's resolution to the appropriate "native" resolution in this case 2160.  

 

There should be no difference in PQ when playing a 1080p movie.  The scaler will do its job regardless of 1080 or 2160 resolution via control panel.  

 

Quote:
Originally Posted by (Evan)  /t/1517698/playing-movies-on-4k-tv-from-htpc#post_24384389


Ok guys, I got the TV yesterday and I am having some huge issues.


1: The TV keeps reading the 1080p input from my computer as 4096×2160. For some reason this creates a lag of about .30 seconds for my mouse and for the audio on videos. Everything is out of sync. The only way to remedy this is to go to the NVIDIA control panel and switch back and forth between various resolutions...until it randomly starts working. When it shows 1080p as the input, the lag is gone. What could cause this? It resets back to 4096×2160 each time I turn off the TV or computer. Not something I can live with if it isn't fixable/


2. When I have the 3D setting turned on in the NVIDIA control panel, I get the same exact lag even though the TV is displaying 1080/24p. I have to set an audio delay in PowerDVD to .30 seconds in order for the audio to be in sync. Not even going to try 3D gaming.


Any idea what could be causing these issues? I'm about ready to send the set back.


Thanks

 

1.  What you are describing is input lag.  There is a lot of processing being done via your Sony 4k TV.  To eliminate this processing so that you can play games you are going to need to figure out how to turn them off.  Some TV's have an AV mode called "games/sports"  which will turn the additional image processing off.  I have a pretty good feeling that these early model 4k sets have additional "scaler" processing going on to enhance 1080 signals.  Needless to say... to it off.  Especially considering you will not need the processing considering you have an HTPC that will play games at the native resolution.  

 

2.  The 3d setting via Nvidia control panel does the same thing to me.  It induces tons of input lag.  I have found that it is extremely difficult to take a high end TV and make it act like a high end computer gaming monitor.  It is possible though... play around with the settings on the TV.  Personally, if I didn't have the AV mode "games" on my Sharp SQ than I wouldn't be playing games (especially FPS games) cause of the input lag.  

 

A side note:  playing games at 2160p will be possible on this particular set due to the update Sony is to release or already has.  I do believe though that it will be ycbcr 4.2.0 

 

[ernicoats]

did you ever figure this out. I am looking at getting a sony 4k tv to connect to my HTPC and set the HTPC to 4096x2160 and have it do all the up-scaling. Which I would think is better than the TV doing the work.

 

[stanger89]



Quote:
Originally Posted by jhughy2010  /t/1517698/playing-movies-on-4k-tv-from-htpc#post_24714291


There should be no difference in PQ when playing a 1080p movie.  The scaler will do its job regardless of 1080 or 2160 resolution via control panel.  

The issue is which scaler. If you set the PC to output 2160p then the PC will do the scaling/processing and normal PC processing (unlike madVR) is "average". If you set the PC to 1080p output, then the TV will do the scaling/processing to 2160p, and as these "4K" sets are still only the high end models, Sony has some pretty fancy video processing on them (ie "Reality Creation"), the like of which is just not available on a PC.


Which one is "better", or more pleasing? I can't answer that, so you'd need to try it yourself and see, but given that there is scaling going on, there is likely a difference between having the PC do it, vs letting the TV do it.