• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

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.
 
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)?
 
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 for FFMpeg or something.
 
Last edited:
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.
 
Then something has altered your PC. Like I just posted, if the error can be grabbed using software it's not a monitor issue.

jhrf6f.png


I would say your monitor is fine, you have an issue with the files and the people who can't see the error have bad eyesight or bad screens themselves.
 
Last edited:
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?
 
Yes, I see the issue in all of your posted evidence. The issue may have always been present but you just didnt see it before due to different settings.

The settings may be codec related or perhaps a bug fix in a video driver or even something as simple as a change in contrast.
Upping the contrast on your images will lessen the visibility of the issue for example.

Essentially, you will have to **** around and work it out. However, again, your monitor is fine.
 
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?
 
Try MPC-HC, reset it to defaults then untick all the ffmpeg filters within the options.

On this machine I'm using DVXA/EVR Custom Presenter on a GTX260 with the 275.33 drivers. No such issues with any mkv file here.
 
I see it too on your screenshots, so can't be the monitor mate, must be a codec or just bad conversions (also was the source interlaced video ?) . Also you said you don't see them on your TV, I'm guessing because your black levels are different on your tv compared to the monitor. Also TV's have hardware or software which can remove artifacts from the video (maybe a setting on the TV you can turn off and see what I mean).

The rule is if you can screen capture the artifacts it is not the monitor. Also maybe try calibrating your monitor, use something like this http://www.lagom.nl/lcd-test/ or a THX DVD or Bluray with the THX optimiser on it.


Have a look at this http://en.wikipedia.org/wiki/Interlaced_video and scroll down to Interline twitter.

does it look like Interline twitter on your screen ?
 
Last edited:
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.
 
Check what I said above regarding interlace video and Interline twitter ;). Have a feeling maybe a form of Interline twitter you are seeing because the files are not converted in a high standard way.
 
Last edited:
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?
 
You must log in or register to reply here.
Back
Top Bottom