A short video showing why the "Open Source Scan Converter" (OSSC) isn't the best choice when fast video mode changes are mandatory!
Many Atari ST/Falcon and Amiga demos use this technique.
Video mode changes (red LED, sometimes "No Sync" in display) result in nasty short sync dropouts.

The "sync mod" for the OSSC (removing R35, put a wire in, FW 1.x) doesn't help with this issue!
With the mod I even had more problems in OBS Studio than before!
So I reversed the mod and went back to FW 0.90!

The cheap and simple Scart/HDMI converter from delayCON doesn't have this problem and transitions are flawlessly!
But unfortunately everything else on this unit is crap by comparison! ;-D

Demo used in this video: https://demozoo.org/productions/54468/