Does OBS/another app let you "see as captured" your HDMI to USB 3.0 capture?

I have a very distinct timing problem with getting Sega Master System Sega Scope material correctly working live on my monitor in 3D.

Apparently a Retrotink 2x Pro M displays what comes through component video as captured and when I see Zaxxon 3D, My monitor directly from my retro tank displays the properly alternating left right frames.

Would I put on the monitor to see what frame rate it says it is it says it is 59.9 Hz.

However no matter what I do when I go through the computer there's no way I could get a 59.9 Hertz playthrough on my alternate screen with a variable monitor rate from 48 Hz to 144 Hz.

Does either OBS or another third party product on Apple Macintosh lets you send the HDMI picture as it was initially captured without trying to force it into 60 frames per second.

Because every time OBS touches it, it seems like it does a stutter step instead of a regular left right left right like it occasionally frame doubles one of the frames on the alternate frames stereoscopy.

It seems like my retro tank device is correctly converting it to something my monitor would display very similar to a CRT. I would use that directly except for the fact that the Sega scope glasses block out the TV because of the way the fixed polarization in front of the glasses work.

I thought if I could put my monitor in tate mode, And if I could preserve the exact same frame rate of the original video with as little alteration to the video is possible I should be able to get a 59.9 Hertz rate on my video display.

The other problem is when going vertical I can't have the whole screen be dedicated to just that one input. If I can I would be perfect. I would like my second screen which is variable rate to output the video footage itself for me to play through locally and have it at the 59.9 Hertz rate.

Is there a way you could set the full screen image of the second screen to be the game footage and have it be accurately translated in whatever frame rate it was captured in?
 
I made a little progress. I found a way to full screen display the capture card on a tated monitor. You just click on the source click full screen display and send it to your monitor.

Unfortunately it seems like OBS has a very specific rate of 60.00002 Hertz when the SegaScope needs 59.9

Mike Chi AKA Retrotink2 on X got it where the flashes of the left and right eyes are "regular" with no stuttering. My monitor reads the Retrotink directly as a 59.9 Hz monitor, but in "variable Hz mode" the number associated with the Hertz rate fluctuates wildly between 55 and 144.

Has anyone successfully gotten a Sega Scope game correctly paced on a tated TN monitor? Someone suggested a rate of 1498/25.

Also I notice that the "valid frame rates are very tight. Between 60.0002 and 60.0002" For a "range" that is awfully specific and a range that is exact to the nearest ten-thousanth frame per second.

Has anyone made the valid frame rate range more programmable. There's only six different ranges and all of them are in exact number from itself to itself (Not exactly a range we're talking about here)

Why is that sitting there if you can't adjust it?
 
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