Haha yeah, it definitely doesn't handle that well.
It shakes all over the place for me
View: https://www.youtube.com/watch?v=cMSzxQjj6ZE
So I learned a fun hack that kinda works.
If you are not getting a stable signal from the OSSC from an F3/Betsu setup, switch to the active (AV2 or AV3) known-good input, and back to the F3.
You MUST have something connected and running on the OSSC to lock onto in AV2 or AV3.
Eventually the OSSC will lock onto the F3, and be stable AF. (BUT only when you are streaming out of the betsu as SCART to AV1 on the OSSC)
Sometimes you need to flip back and forth a couple of times until it works.
It's stupid, but that's what I saw on some development notes here about it
http://junkerhq.net/xrgb/index.php?title=F3.
In my dual cabinet setup, my Blast city has a splitfire (VGA), and my NAC has a Betsu (scart) going into my OSSC.
The OSSC is default settings outputting to a Datapath E1S capture card via HDMI.
I lose signal out of the OSSC to my capture card. (YES I've also lost image from the OSSC with a monitor directly connected to it)
The OSSC can't handle some of the output from the betsu as good as the Splitfire does.
Meanwhile the splitfire in my Blast sends a buttery locked signal to the OSSC to digest, no matter the PCB.
Usually I see this happen with boards that have low video output, flashy graphics, or weird sync.
The below boards and conditions have been noted.
-Taito F3 - almost all games
-Irem M72/92
-Some STV games (like Diehard that switch resolutions quickly)
-SETA SSV (I get flicker/jumping, or no signal at all
-Seibu Kaihatsu games (when you bomb the screen with massive flicker - Raiden fighters series)
-CPS2 (also when you bomb the screen with flicker. Diamahoo does this)
-CAVE EsPaRaDe (Magician boss when he moves with echo flicker pattern around screen)
I know I have a list of more, but that's off the top of my head with concern to streaming my PCBs on a rotating and regular basis.
@evilsim makes these sweet 8pin DIN to VGA sync cleaners.
They're convenient if you want to run all your cabs with a VGA splitter into your OSSC vs SCART + VGA
They didn't solve my problems, but they are nice to have around.
In a perfect world, I get a scaler per cabinet, set individual profiles for board sets, and run a HDMI switch into my capture card.
For now the above solution of both cabinets (NAC w/ SCART, and Blast w/ VGA going in the OSSC) is the best I can do despite screwing with timings, and other OSSC tweaks.
for now... this stupid shit-scaler is the only thing that seems to take whatever signal I throw at it, and it handles it. (not great, but it does the job enough)
My solution is really solved by either finding another Splitfire, or a compatible scaler with the above solutions.
If ANYONE would be willing to sell me a spare Splitfire they have collecting dust on a shelf, please contact me ASAP.
I will love you long time.