RADV Vulkan Video Making Progress On H.264 Encoding

Written by Michael Larabel in Radeon on 29 December 2022 at 05:32 AM EST. 9 Comments
Earlier this month prolific open-source GPU driver developer David Airlie at Red Hat picked up work again on Vulkan Video support for the RADV driver. Initially that RADV Vulkan Video work was focused on H.264 and H.265 video decoding while since then he has shifted focus to preliminary video encode support with H.264.

With getting a handle on the RADV Vulkan Video decode support for GPU-accelerated acceleration for the newly minted extensions, Airlie turned his focus to video encoding.

The Khronos Group overview of current and planned Vulkan Video extensions.

Vulkan Video encoding for this open-source Radeon driver proved more challenging and involved porting more code over from the Radeon VA-API driver as well as accommodating for AMD VCN encoder engine differences. FFmpeg developer Lynne worked out the FFmpeg-side Vulkan Video encode usage.

Per Airlie's blog, things are beginning to work but will take more time to iron out:
"Lynne meanwhile had written the initial ffmpeg side implementation, and today we threw them at each other, and polished off a lot of sharp edges. We were rewarded with valid encoded frames.

The code at this point is only doing I-frame encoding, we will work on P/B frames when we get a chance.

There are also a bunch of hacks and workarounds for API/hw mismatches, that I need to consult with Vulkan spec and AMD teams about, but we have a good starting point to move forward from."
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