OSSC 1.8 keeps ‘resetting’ (flicking to black screen) and back on PS2.

[Oltonian]

Hi all,

Please bear with me as I am not an OSSC aficionado! I bought an OSSC 1.8 last Christmas and am really happy with it. I run a Sega Mega Drive (Version 1) through the scart input with no problem, and a PS2 through the composite and headphone socket inputs (5 cables total). I’ve set my OSSC up to match these settings:

https://www.youtube.com/watch?v=ti1JgFVH1uM

With the only differences being:

1. The H Samplerate being set to 864.20. My TV (Samsung QLED 43″) won’t detect a signal if I set H Samplerate to 691 as in the video.

2. I’ve also set sampling phase to 236 degs as this looks cleaner.

3. I have set the pre-gain up to 12 because it looks clearer. Everything else is as in the video. Not sure how to detect which firmware version I’ve got but if someone lets me know I can check.

4. YCbCr444 instead of RGB.

5. Using Line4x for 576i and Line2x for 576p causes my TV to not detect signal, so I’ve used Passthru for both.

I’m having an issue where the screen will intermittently drop out during play. The screen will go black for 3 seconds, and it is clear that the game is ‘catching up’ in the mean time because the action advances wildly while the screen is resetting (e.g. in GTA3 my car will be 200m down the road, further than it could have travelled in real time while the screen was off.) I also get this message:

AV2_YPbPr 625-i

15.62kHz 49.99Hz.

The screen flicker is random. It can happen in live action or on loading screens, and seems to be worse when I start play (maybe 3-4 instances in first ten minutes, before settling down to 1 instance every 20mins or so.

I suspect the changes I’ve made to ‘negotiate’ with my TV have caused this (is the 49.99Hz causing the problem, should it be 50?), but if anyone could set this right I’d be very grateful.

 

 

 

 

[BuckoA51]

When the blackout occurs is there anything on the OSSC that changes, does the LCD flicker or does the LED change at all?

[Oltonian]

Hi Bucko,

 

Thanks so much for the quick reply. Just tested it – the green LED on the front of the OSSC stays solidly green throughout.

The white LCD screen however, flickers away to something else briefly. In normal mode it shows:

AV2_YPbPr 625-i

15.62kHz 49.99Hz

but during the blackout the ‘625’ flicked over to ‘312’ or a similar number. It definitely started with a 3.

• This reply was modified 8 months ago by Oltonian.
• This reply was modified 8 months ago by Oltonian.
• This reply was modified 8 months ago by Oltonian.

[marqs]

Try adjusting sync opt -> Analog sync Vth a couple steps higher or lower. It’s also worth checking that you have relatively recent fw (1.11 or 1.12).

[Oltonian]

Thanks – I updated firmware to v1.12 and it has sorted the timing issue. However, I’ve reinstated the settings described in the original post and I feel that the picture has become slightly worse. There’s been a clear improvement in lighting at night, but draw distances and contrast seem to have suffered. I’ve turned the samplerate up to 236 degs to compensate.

[BuckoA51]

OSSC cannot affect a consoles draw distance. Calibrating your TVs brightness/contrast using a grey ramp (such as those available on 240p suite) would be a good idea.

[Oltonian]

I’ll have a look at this and report back, thanks a lot!

[Oltonian]

As an aside, my TV can cope with Passthru and Line2x but cannot read anything else, detecting no input. Is there any workaround for this?

[Zacabeb]

You should preferably set H Samplerate to 864.00 for the PS2. The fractional part from the 691.20 pixel sample rate comes from optimizing for games that output at a 512 pixel wide resolution rather than 640 pixels. In passthru mode, the OSSC will round it down anyway, but it’s worth knowing. 🙂

As for the phase, there is no proper default setting. Adjusting it to whatever gives the cleanest picture as you have done is the right approach. However, unless the sample rate matches the actual resolution being output by the console, no setting will give perfect results. With the sample rate set to 864 which is perfect for PS2 games that run at 320 or 640 pixel resolution, games that use the 256, 512, and 384 pixel resolutions will always have alternating bands where the picture is softer or sharper.

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