Capturing JP Mega Drive through OSSC into OBS

[Sengoku Strider]

I'm trying to get an NTSC JP Mega Drive to OBS gameplay recording setup together, but after a couple of days of grappling with it I'm still getting stuttery results. It really shows up in the background elements:

https://youtu.be/zwOqZrOEBdo?si=NBK_Zv2bGHIzXzDp

Here's my signal chain:

Model 1 JP Mega Drive SCART cable OSSC HDMI cable Elgato HD 60X USB C OBS 31.0.3 (most recent) on Macbook Pro running OSX 15.4 Sequoia (most recent)

The MD outputs at 59.1 FPS, the closest OBS seems to do is a custom integer value of 59.0, but I'm not sure if that's the heart of the issue. It looks fine on the TV, so I'm not thinking it's an OSSC-side problem.

Any advice on how to resolve this one?

[blameachoo]

Yes, the stutter is likely due to the FPS mismatch—try setting OBS to match the exact 59.18 FPS output from OSSC using a custom fractional value, or use a capture card that handles variable refresh rates better.

[Konsolkongen]

A japanese Mega Drive should be much closer to 60Hz. Something seems wrong :/

[Steven]

I believe MD's refresh rate should be ~59.92Hz, just slightly off from NTSC standard ~59.94. If you're getting 59.1, you have something very odd/wrong going on. 59.1Hz is about what the Neo Geo MVS does, not MD.