Rough jitter streaming PS2 via RGB with OSSC

[Glitchedd]

I just got my full RGB Setup for streaming PS1/2 speedruns and everything was looking amazing until I noticed this really bad vertical jitter.

My current setup is:
PVM 14M2U
PS2 Slim
OEM PS1 RGB21 cable – plugged into Female RGB21 to BNC adapter, which is being inputted into my PVM.
BNC to Male Scart adapter – Outputting image from PVM by plugging into the OSSC’s RGB Input.
From here, I output the image in HDMI from OSSC to my capture card (micomsoft sc-512n1-l).

I understand that with 480i there will be some jitter and there will be a slight jittering effect from the 2x bob deinterlace, but this seems a tiny bit unordinary. Every handful of seconds or so, the screen will jitter pretty powerfully on and off before stopping.

Is there anything I can do to fix this? Video example: https://www.youtube.com/watch?v=xxY5kEpwVZY
If it’s normal/common, are there any workarounds or suggestions to making it look a bit better?

[BuckoA51]

It looks like regular bob deinterlace to me I’m afraid. Can you force your target game to progressive mode with e.g GSM or would that throw your speed run off?

[Harrumph]

Either use passthrough and let your capture card de-interlace, or use 2x with alternating scanlines at 100% strength.

[Zacabeb]

Something is causing frames from the output of the OSSC to get doubled up every so often. It could be something in the capture chain (card or capture software) conforming the input from 59.94 Hz to 60 Hz or simply not liking the timings of the OSSC output. The bob de-interlacing reveals it more brutally than a natively progressive picture would.

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