They provide fully accelerated H.264 and H.265 decode.

Khronos has finalized Vulkan Video extensions released for "seamlessly integrating hardware-accelerated video compression and decompression into the Vulkan API." The extensions expose Vulkan Video functionality to provide fully accelerated H.264 and H.265 decode.

According to Khronos's blog, Vulkan Video extensions enable "efficient, low-latency, low-overhead use of processing resources for accelerated video processing, including distributing stream processing tasks across multiple CPU cores and video codec hardware."

Vulkan Video was designed to be flexible enough to support existing and future codecs. It includes both universal "core" extensions and codec-specific extensions that are only useful for one codec type. 

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