An FFGL effect that runs your clip through a capacitor-coupled video amplifier whose clamp has failed. One RC high-pass runs in real time through every line and blanking interval of a full 625/50 or 525/59.94 field, so black wanders about with the picture content, a bright moment darkens the next one, and lines and fields tilt. Supply sag and a triode stage sit on top.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.