CurtPalme.com Home Theater Forum

stridsvognen · Guest

mp20748 · Posted: Thu Feb 12, 2015 8:13 pm Post subject:

stridsvognen · Guest

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

mp20748 · Posted: Thu Feb 12, 2015 8:33 pm Post subject:

Yes, read what I said about checking the size of the pixels and the top two group size. Doing the 1:1 is not what to look for. The top two must match in size

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Mike that is a whole different thing you quoted there. It is what many TV's do to deal with varying aspect ratios. But if you go directly into the timings on a Lumagen and set it to 800x1920 the Lumagen will not try to scale it to look right. That has to be done with the PJ's size control.

Here is a video I took a few months back with my iPhone 5s, so its not the best but it clearly shows
how Active Area Scanning does not mess up a 1080p encoded disc and actively scanning only 800 lines.

1080p DVE Blu Ray scaled to 800px1920 @72Hz

https://www.youtube.com/watch?v=LCIPYZhpMlM

Athanasios

stridsvognen · Guest

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

mp20748 · Posted: Thu Feb 12, 2015 9:27 pm Post subject:

mp20748 · Posted: Thu Feb 12, 2015 9:31 pm Post subject:

stridsvognen · Guest

mp20748 · Posted: Thu Feb 12, 2015 10:54 pm Post subject:

mp20748 · Posted: Fri Feb 13, 2015 5:07 am Post subject:

I had asked about someone posting a shot of the center pattern on the SMPTE showing the top two groups. That didn't happen, so I use the one Nash posted, and have also posted one from my setup for comparison. Remember I said to look at the size and the size of the lines. I also mentioned that the lines in Nash pattern did not look to be 1:1

And my reason for asking that the pattern be posted was to prove that the scaling of 1920X1080 produces on screen the exact same image as what is in the 1920X1080 source. As told, the scaling removes the non active image and sizes out the same data that's in the source image to fit the screen.

redfox001 · Joined: 16 Mar 2009 Posts: 2251 Location: The Netherlands

I would say the display is doing the resizing and that there is no resizing or scaling in the scaler when putting out 800p?

I mean the intelligence for the algorith doing the cropping could be simple to judge the pixel on its line counter and reject the ones that are outside the 800 active lines. No intelligence neede for that I think. But if the scaler messes up bitdepth and chroma that is another thing. In a pc I think the cropping is simpler and posible ideal?

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

The magnets needs quite a bit of work.

redfox001 · Joined: 16 Mar 2009 Posts: 2251 Location: The Netherlands

He I see you removed the info about tearing. I found it quit useful as it explained how the windows dwm system is causing vsync problems. I had vsync problems too when I tried windows. It was very extreem that the upper part became the lower part and a beam in between them.

I did not use the aero theme as you said they force windows dwm to the gpu. I try it the next time I play with windows.

Your tearing problems are completely solved now?

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

Yes, the problem seemed to have been resolved but then came back again.

But I eventually figured it out what's causing it.. it's the dual output from the graphics card doing this. Without the monitor hooked up it works fine and no tearing.

Read the part about password removal before doing any of this though. It looks like one needs to disable that first or else one can't access the pc after.

http://www.overclock.net/t/1441921/windows-8-1-no-dwm-aka-aero-aka-desktop-composition

https://www.youtube.com/watch?v=7juA4v9Z8EM

redfox001 · Joined: 16 Mar 2009 Posts: 2251 Location: The Netherlands

Yes I watched that video. Great tips for my next windows experiments. I wonder if simple installing XP would not solve most problems.

By the way what player do you use? Mediaplayer?

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

My favourite media player has always been XBMC, but changed it KODI last night in efforts to figure this one out, but the later is slow when turning it off so I'm going back the XBMC again. Of all the players I have tried that one is just perfect when it comes to contrast and brightness and always leave them at deafult with 50.

VLC player for an example, I always end up playing around with those and when I tested it last night I noticed it had sharpness enhancement on it too, on earlier versions I don't think they had that feature, but tried it briefly on Cars.. and well, it looks sharper and all with suddle use, but nothing I would like to have. XBMC doesn't have that, none that I know of anyway, but imo the best media player. The best part is the automatic download of subtitles that takes less then 10 seconds and often faster than that.

What do you use then?

redfox001 · Joined: 16 Mar 2009 Posts: 2251 Location: The Netherlands

I have a Mac and that is completely different. But the subtitle download seems interesting. On the other hand never had problems with sync or tearing or anything. Very now and than there is a short audio drop out but that is all. I am thinking about upgrading the hardware to a faster disk.