Really cool idea from Michael D’Argenio. The set up can combine feeds from a variety of sources but Michael uses a Pi Zero for the composite video. on Hackster.io:
Today, I will be teaching you how to build a glitchy A/V “mixer” that I’ve affectionately called Dorkwave. “Mixer” is in quotations because it’s a rather simple device that directly connects 2 composite video signals and an audio signal. Despite its rudimentary nature, it produces some rather beautiful, distorted effects. It’s great for live performance set-ups or just to mess with in your room.
This project requires a little bit of hardware knowledge, some breadboarding and/or soldering, and a little bit of patience.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.