Sorry, Andrew. In the first test, Color 3 Way, Titler, and Videoscope weren't working, but then I closed CinGG and restarted it, and everything worked fine. However, I didn't realize that restarting had reset the format to the default, which is YUVA-8 bit. That's why everything worked.

In reality, the three plugins are applied but do not produce results. There are no errors on the terminal, except for Videoscope, which produces:

ScopeUnit::process_package 337: color_model=16 unrecognized

I have tried several other plugins, both native and ffmpeg, and they all work without any problems.