The speaker gave a talk about 4K HDR video with AV1 at the FOSDEM conference in 2023. The main focus of the talk was to discuss the technical challenges of playing back AV1 streams in HDR and retaining accurate colors. The speaker provided an introduction to HDR and explained its various aspects, such as brighter pixels and more bits. They also discussed the challenges of displaying HDR content correctly on different operating systems and consumer displays. The speaker shared their solution of using playback capture cards and a reference monitor to play and display HDR content accurately. They also discussed the importance of testing HDR signals for brightness, viewing area, color, and bit depth. The speaker concluded by mentioning the challenges of extended HDR to 12 bits in the future and the considerations for viewing HDR content, such as the viewing environment and individual perception.