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Firefox 153 Available With Support For Vulkan Video Decoding, Experimental JPEG-XL
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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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What does Vulkan video decoding do?
Nvidia and AMD both have differing APIs for video decoding. The idea in using Vulkan is that not every GPU supports the vendor specific decoding method, but they do all support Vulkan (modern GPUs, anyways). So this way you still get hardware accelerated decoding through a more widely supported means.
The article says
So it's basically just because the existing video decoder API in Linux doesn't have support for various hardware devices for various reasons. But those devices still have Vulkan support. Not sure why Vulkan support for those devices wasn't just added to VA-API, who knows.