Posted for the AMDGPU Linux kernel driver in early 2024 was the initial Video Core Next 5.0 IP enablement that was part of their bring-up for the Radeon RX 9000 "RDNA4" graphics processors. It's taken until now though for enabling the VCN5 video encode/decode support within the user-space code for the RADV driver with Mesa 25.2.

AMD contractor David Rosca has landed RADV Vulkan Video support for VCN5 both for accelerated video encoding and decoding. Rosca commented in the Mesa merge request :

"Passes CTS, all h265 encode tests are skipped due to minimum width requirement."

The Video Core Next 5.0 block had already been supported by the RadeonSI Gallium3D driver with the Video Acceleration API (VA-API) while now these Navi 4x GPUs can also enjoy accelerated video using the modern Vulkan Video API with RADV.

This support is merged for Mesa 25.2 that should be out as stable in August.