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Video Playback Issue

Overslop

Overslop

Overslop

Soldato
Joined
22 Oct 2005
Posts
4,013
Location
Thailand
Bought a Hazro HZW27A recently and mostly I'm very pleased with it. However, there is one particular issue that is bugging me a great deal. I'm not totally sure if the monitor is at fault, but I certainly never noticed this before switching screeens.

When watching quite a number of MKV video files, I get horizontal lines across the screen on some dark backgrounds. As far as I can tell, other video containers are not effected but I haven't tested enough to say conclusively. Additionally, I noticed something similar in the game Zombie Driver though it may be unrelated.

Please see the image below to see what I'm talking about:

6dd8d4ce.png


In attempting to fix this issue, I have tried various media players. VLC Media Player uses self-contained codecs so should not have replicated the fault if it was that kind of problem. Unfortunately it suffers just as badly as Media Player Classic. Oddly, Windows Media Player seems to fare the best.

I've uninstalled and reinstalled the latest K-Lite Codec Packs (both 32 bit and 64 bit versions). This hasn't helped either. I've tweaked countless settings in the media players as well as in the nVidia Control Panel but still no joy. Updating the nVidia drivers didn't change anything.

I'm posting this topic in several forums here in the hope that someone can lead me to a solution. Please don't be offended that I am posting in more than one place. The reason I'm doing this is that I'm not certain what is causing this and want as many people who can help me to read this as possible.
 
tommybhoy said:
I'm guessing it's the actual codec, due to compression from blu-ray to the mkv container. Have you tried an actual blu-ray file with Cyberlink PowerDvd 11 or Arcsoft TotalMedia Theatre 5(I would imagine there will be no horizontal lines from a true blu-ray file)?
Click to expand...

The thing is, it's a really noticable problem and I'm fairly certain that on the 40" TV I was using previously it never showed up watching the same video files.
 
yashiro said:
If you can screen grab it, it's not the monitor.

Additionally, it's not stricly horizontal lines. It's a fine pattern going horizontally that repeats over flat coloured areas. Up the brightness and lower the contrast on that image in Photoshop.
It looks like a codec issue; either an encoding artifact OR your system has some spazzed out settings (noise reduction?) in FFMpeg or something.
Click to expand...

Are you stating that you can see the issue in the screenshot I posted here (not the one in the monitor forum)?

Only asking as nobody else seems to see anything wrong with the screenie thusfar.
 
Like I just posted, if the error can be grabbed using software it's not a monitor issue.
Click to expand...

Yep, I realise that mate.

So you can confirm that you see the error in the image I posted in this topic yashiro?

And what do you mean something has altered my PC - can you be more specific please?
 
The thing is though that I've already uninstalled and reinstalled everything on the codec front and doesn't VLC use its own?

Something that did occur to me earlier, and has been mentioned by a poster in another forum - could it simply be that it's upscaled to 1440P?
 
I'll try calibrating it further but I've tweaked the OSD settings a great deal already (contrast, brightness, RGB etc.) and just can't sort it out.

Going on what I have so far, relatively poor quality MKV files being upscaled to 1440P seems to be the most likely culprit. Waiting for more feedback, hopefully from people as picky as me about such visual blemishes with an ultra-high res screen. ;)

Up against that theory is poor quality AVI files not producing similar errors, albeit from limited testing.
 
There are lots of MKVs which work fine for me. The higher the size, the less likely they are to have issues. So it's still looking like an upscaling problem right?
 
Orcvader said:
If you can't see the problem when the video is being played on normal size, but can when upscaled to 1440p, then perhaps it could be an upscaling problem. Try setting the desktop resolution to 1080p and see what happens when you play a video fullscreen?
Click to expand...

I did try setting to 1080P already, but it doesn't improve things. Even setting to 1080P resolution, just means the monitor will upscale it to 1440P anyway.

However, playing in a window DOES make things better, further supporting the upscaling argument.
 
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