Subject: Technical inquiry regarding OSSC Pro: 120Hz output for 480i Line Multip

[haofuyihao]

Hi Marqs,
I am a long-time user of both the OSSC and OSSC Pro. I’m writing to discuss a technical observation and a potential feature request regarding 480i content on IPS monitors.
As you know, playing 480i consoles (like the PS2) on IPS monitors using Line Multiplication (Bob deinterlacing) often triggers a DC offset/bias issue. This results in temporary image retention or “burn-in” due to the liquid crystals being driven in a way that doesn’t allow for proper voltage inversion.
However, I recently discovered an interesting workaround:
When I route the 480i Bob-deinterlaced signal through a capture card into a PC, and then output it to a high-refresh IPS monitor at 120Hz, the visible image retention/ghosting disappears completely. It seems that the higher refresh rate effectively mitigates the DC bias issues inherent to the panel when handling Bob deinterlacing.
Currently, my setup is quite cumbersome as it requires a capture card and a PC. I was wondering if it is technically feasible for the OSSC Pro to implement a 120Hz output mode specifically for 480i Line Multiplication?
While I am aware that the OSSC Pro’s Scaler mode avoids this problem entirely, I personally prefer the visual aesthetic of Bob deinterlacing. To my eyes, the rapid alternating scanlines create a unique sense of temporal continuity that results in an indescribable depth and color blending that scaling simply cannot replicate.
Given the hardware capabilities of the OSSC Pro, do you think a 120Hz output for line-multiplied 480i is something that could be achieved in a future firmware update?

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