Screen tearing – OSSC Pro (Scaler mode) – PS1 – Spyro

[Dumpling]

Hi all,

I’m having an issue with screen tearing along the bottom of the screen while playing Spyro the Dragon on a PAL PlayStation 1 using the OSSC Pro (firmware up to date). I’m running the OSSC Pro strictly in Scaler mode — I haven’t tested line multiplier modes yet.

Setup:

Console: PlayStation 1 (PAL)
Cable: PlayStation 1 PS1 RGB SCART PACKAPUNCH sync-on-luma cable
Display: Samsung UE49MU8000 4K TV
OSSC Pro output: 1080p (50–120)
Display settings: Scanlines + Shadowmask enabled
Scaler mode only
Game mode: On (issue seems related)
Framelock: Initially caused tearing/rolling, partially fixed by setting it to 50 and turning Framelock off

The tearing shows up when rotating the camera in-game, and it’s most noticeable along the bottom edge of the screen. When I tested the same setup on my parents’ Panasonic HDTV, the issue didn’t occur — which makes me think it’s specific to how the Samsung handles OSSC Pro output.

I tried turning Game Mode off on the Samsung and that seemed to eliminate the tearing, but ideally I’d like to keep Game Mode on to benefit from the lower latency.

Also, are certain scaler algorithms known to handle this sort of thing better than others? I’d like full access to them so I can tweak image sharpness for dithering accuracy.

Has anyone else seen this with Samsung 4K TVs (especially the MU8000)? Any advice on settings or known workarounds would be hugely appreciated.

Thanks in advance!

• This topic was modified 3 days, 22 hours ago by Dumpling.

[BuckoA51]

This is likely caused by a miss-match between the frame rate of the game (PAL PS1 doesn’t run bang on 50hz) and what your TV natively supports. By turning frame lock off you’re outputting a slightly different frame rate, usually this results in a stutter rather than a tear though. By turning game mode off you prevent the TV double or triple buffering the image.

Does the MU8000 support VRR or similar? You could try turning VRR flag on, on the OSSC Pro, this has been known to solve the issue on some TVs.

[Dumpling]

Cool, thanks for your response. I’ll check later. I’m pretty sure my TV doesn’t have VRR, I could be wrong.
Are there any other settings in the OSSC Pro I could try? The issue seems present with Framelock both on and off, and I would like Game Mode on on the TV.

[marqs]

Have you tested its game mode with any other 1080p50 source? You can also try fine-tuning refresh rate with “Off (preset Hz)” and via “Output opt -> Adv. disp timing” if that makes a difference, but overall it sounds like a TV issue (especially if you can replicate it in A-LM mode).

[Author]

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