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VGA Capture Thread

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Reply 800 of 804, by darry

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Master1UP wrote on 2020-05-20, 19:36:
Well lets put that somewhere around 50% satisfied. I finally tested my Gefen with a game and I might have faulty unit or is thi […]
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Master1UP wrote on 2020-05-19, 06:46:

You might be right. Actually I happened to bump into Gefen VGA-DVI Scaler Plus without power cable on ebay for reasonable price (about 30€) and the results are literally like night and day. I still have to adjust some settings before I stream but so far I'm 100% satisfied.
I contacted the seller about possible firmware updates for the chinese scaler but so far no reply. They told me they will contact the manufacturer about it but I don't think I will hear from them anymore. But anyways here's the comparison of the two.

Well lets put that somewhere around 50% satisfied. I finally tested my Gefen with a game and I might have faulty unit or is this something to be expected with this device? I tried many settings and adjustments, but I can't seem to do any visible difference.
Especially in the staircase you can see how the darks are brown and muddy and it loses most of the details. In bedroom scene the ceiling is losing most of the detail and stones next to the door are also brown and muddy.
Raising the brightness just brings "crawling ants" more visible on some colors. First I thought it's my cables but that's not the case. I tried many different combinations. Funny thing is that my Chinese scaler works with this game perfectly and it's not blurry like in windows and DOS. At least with this level of detail it doesn't look like it to the eye.
Staircase comparison is with camera because I can't capture yet both with same setup.
If anyone has any advice or can tell if my unit is definitely faulty, please let me know.
Model: EXT-VGA-2-DVISP (Gray)

If having shimmering/movement that isn't there, try phase adjust on the Gefen . Can't speak for other issue .

Reply 801 of 804, by Master1UP

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darry wrote on 2020-05-21, 18:50:
Master1UP wrote on 2020-05-20, 19:36:
Well lets put that somewhere around 50% satisfied. I finally tested my Gefen with a game and I might have faulty unit or is thi […]
Show full quote
Master1UP wrote on 2020-05-19, 06:46:

You might be right. Actually I happened to bump into Gefen VGA-DVI Scaler Plus without power cable on ebay for reasonable price (about 30€) and the results are literally like night and day. I still have to adjust some settings before I stream but so far I'm 100% satisfied.
I contacted the seller about possible firmware updates for the chinese scaler but so far no reply. They told me they will contact the manufacturer about it but I don't think I will hear from them anymore. But anyways here's the comparison of the two.

Well lets put that somewhere around 50% satisfied. I finally tested my Gefen with a game and I might have faulty unit or is this something to be expected with this device? I tried many settings and adjustments, but I can't seem to do any visible difference.
Especially in the staircase you can see how the darks are brown and muddy and it loses most of the details. In bedroom scene the ceiling is losing most of the detail and stones next to the door are also brown and muddy.
Raising the brightness just brings "crawling ants" more visible on some colors. First I thought it's my cables but that's not the case. I tried many different combinations. Funny thing is that my Chinese scaler works with this game perfectly and it's not blurry like in windows and DOS. At least with this level of detail it doesn't look like it to the eye.
Staircase comparison is with camera because I can't capture yet both with same setup.
If anyone has any advice or can tell if my unit is definitely faulty, please let me know.
Model: EXT-VGA-2-DVISP (Gray)

If having shimmering/movement that isn't there, try phase adjust on the Gefen . Can't speak for other issue .

Thanks, I will try that.

Reply 802 of 804, by darry

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I went scaler shopping and got
1 Crestron HD-SCALER-VGA-E
1 Extron RGB-DVI 300.
I already had 1 Gefen VGA to DVI Scaler Plus .

The Crestron will not do 720x400 or 320x200 (640x400), even with latest firmware . It works fine otherwise .

The Extron does 720x400 and 320x200 , but I get shimmering text and I can't manage to center the image properly without generating ugly scaling artefacts, even on 1600x1200 output . I think it may have hardware issues, but the uneven scaling artefacts are something else . See following post for fix . I can't see firmware version in OSD, will have to wait on serial inteface cable adapter (2.5mm TRS jack, how convenient) for CLI access . I will do more tests later, but it does not look positive .

The Gefen actually works well in 720x400 and 320x200 and has good picture quality . It's only two issues are slow mode changes and flashing a resolution change info logo . It can even handle some oddball modes (Ambience by Tran) but blacks out on the hard parts in Copper .

My aim is not really capturing at this point (I do have a Camlink 4K), but was hoping to drop my dependance on monitor aspect ratio controls and VGA port presence . Gefen is close but not perfect .

P.S. video card for tests is a Voodoo 3 3000 .

Last edited by darry on 2020-05-25, 23:46. Edited 1 time in total.

Reply 803 of 804, by darry

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I ran some more tests on the Extron RGB-DVI 300 . I only get the shimmering in 720x400 text mode, not matter the output resolution. 320x200 looks OK at first glance when output at 1600x1200 .
640x480-->1600x1200 looks atrocious IMHO, as does 640x480-->640x480, strangely enough (maybe my Dell 2007FPB sucks at upscaling over HDMI). When run directly through the monitor's VGA input, 640x480 looks fine, IMHO .

I tested 720x400 -->1600x1200, 320x200-->1600x1200 and 640x480-->1600x1200 on the Gefen and the looked fine .

Just to be clear, by "fine" I meant without ugly uneven scaling artifacts. I did not particularly pay attention to relative sharpness .

I will try to post photos or actual captures of what I mean by uneven scaling .

The Extron is excellent .

To get good results on my Extron RGB-DVI 300 , I had to
- use 60Hz for VESA modes
- Realize that I have to manually enter the number of total lines for non-VESA resolutions, such as 720x400 (auto-detection will not handle that on my unit at least) . That fixes the scaling and shimmering issues I was having .
I used the values here for 720x400 --> http://martin.hinner.info/vga/timing.html and now both 720x400 70Hz and 320x200 70Hz display fine .
Basically, that mean setting 726x404 active pixels and 900 total pixels and adjusting the rest for proper centering .

Good thing I realized that as my Gefen just died .

Last edited by darry on 2020-05-25, 23:33. Edited 1 time in total.

Reply 804 of 804, by darry

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My Gefen VGA to DVI Scaler Plus has kicked the bucket . It works briefly when cool, then goes black screen and freezes monitor controls when connected (tested on 2 monitors) . Possibly bad caps, but no apparent leakage and my understanding is that marginal caps work better when warm .