In this post I’m going to show how you can configure your Hyperion Ambilight for every HDMI source.
We need to get the color information from an HDMI input signal. For this purpose, it’s necessary to transform the digital HDMI signal to an analog composite one with a converter. After this, we can grab the composite signal with an USB video grabber connected to the Raspberry Pi. Now we’re able to feed Hyperion with the color information by the video grabber.
Original post from Christian Moser blog.
Hackday article Beautiful DIY Ambilight Display — Hackaday