Vertical (should read Horizontal!) tearing problem...... (1 Viewer)

[tonewheelkev]

...........With respect to the observed horizontal tearing, your screenshot is not showing it. Any chance to make a new one that captures the problem?

Aaaaggghhh....the plot thickens!!!
I can observe tearing (LG 50" HD plasma)....but printscreen fails to show this! Tried VLC to view similar images...and tearing is seen again.....leading to a possible (likely?) conclusion that the fault is with the display....

I should also say that I'm running dual monitors....and the 'other' monitor (DVI to PC) isn't showing same problem.

UPDATE!!!! Have now tested with Freeview HD....and NO tearing....so perhaps display screen is not the culprit.....any thoughts please?????

 

[kiwijunglist]

Hey.

MPAR basically speeds up or slows down both the audio and video so that the fps matches the screen hz.

It's impossible to do this with a live stream. Ie you can't make the tv station play the video any faster. This is why using mpar in live tv is not recommended.

I believe your issue is that vertical sync is not being used. If you Google your issue you may find several forums with vertical sync isdues in windows 10.

With regards to audio processing. There is no double processing if you decode the audio on the pc. If you want to audio decoded on the avr then use bitstreaming which will bypass mpar. Mpar cant use bitstream bc you have to decode audio before resampling it. There is no audio quality loss from decoding on the pc as pcm is lossless format. There should be negliable quality change with resampling the audio fir changing the speed.[DOUBLEPOST=1441383955][/DOUBLEPOST]To clear up a couple of incorrect replies earlier.

Mpar can cause a lot of issues and is not recommended. <-- not true.

If using mpar then it doesnt use windows audio mixer etc. It communicates directly in exclusive bit perfect mode as its an audio renderer.

 

[Owlsroost]

Might be you dont use an windows aero theme. Aero needs to be turned on, atleast that was the case for windows 7.

The 'Desktop Window Manager (DWM)' i.e. Aero - is always enabled in Windows 8 and later - see https://msdn.microsoft.com/en-us/library/windows/desktop/aa969538(v=vs.85).aspx

Disabling DWM Composition
Note As of Windows 8, the information in this section is no longer valid. DWM can no longer be programmatically disabled, nor is it disabled when an application attempts to draw to the primary display surface. The following information applies to only Windows 7 and earlier systems.

 

[tonewheelkev]

.......I believe your issue is that vertical sync is not being used. If you Google your issue you may find several forums with vertical sync isdues in windows 10..........

Never occured to me that this might be part of a wider known issue....but Googling suggests that it is...
Appears it may be worth downgrading the video driver....or even just waiting for an update to come along.

Phew ......and thanks for that....a cheap solution...!!!! [DOUBLEPOST=1441389674][/DOUBLEPOST]

......
The 'Desktop Window Manager (DWM)' i.e. Aero - is always enabled in Windows 8 and later - see https://msdn.microsoft.com/en-us/library/windows/desktop/aa969538(v=vs.85).aspx..........

...Ah Good....was gonna ask about that next.........

 

[kiwijunglist]

it kinda suggests it is, however if you google vertical sync problem windows 7, you will find lots of posts to, however it is working fine with most people in windows 7 re: the tearing issue, I'd suggest see what it is like with turning vsync off. Also try vsync off then restart then turn on again and restart. Try with and without tripple buffering. Try with and without mpar.

 

[tonewheelkev]

Tried various combos....v-sync/triple buffering on/off.....tearing still present on the HDMI screen (Plasma)....but not present on the DVI connected monitor! (Both connected to GT 430)

Perhaps, if the monitor shows no tearing....then could the problem be something to do with the 'delivery' of the HDMI out to the Plasma?!
If so....I realise this isn't a MP issue....!!
What do you think?

 

[mm1352000]

Which monitor/TV does Windows think is primary?
If it is the DVI-connected monitor, what happens if you switch the primary monitor to be the TV?

 

[tonewheelkev]

Which monitor/TV does Windows think is primary?
If it is the DVI-connected monitor, what happens if you switch the primary monitor to be the TV?

They're 'duplicated' as far as I know. Looked in Nvidia control panel....seems to have no make primary/secondary option...

In Windows....they appear as 2 generic monitors...again not obvious which is primary.
Perhaps I'm looking in the wrong place?

 

[kiwijunglist]

Ahh ok. Your problem is related to multiple monitors. You need primary monitor to be tv. I have feeling that only the primary monitor works properly with vsync. Also i would disable refresh rate changer. Set both refresh rates to 60hz (tv and monitor) then reassess the problem and report back.

The reason you have tearing on one display not the other is because you can only vsync one display.

 

[HTPCSourcer]

[
In Windows....they appear as 2 generic monitors...again not obvious which is primary.
Perhaps I'm looking in the wrong place?

Right-click on the desktop and select "Display settings" (or whatever it is called on an English Windows 10). You should then be in the System settings with the option to Identify/Search monitors. Try both options and you'll get your numbers 1 and 2 with the respective hardware.