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elwrclandClaude Opus 5
f68161c313
Only constant QP was offered. Add the two bitrate modes, with the quantizer derived once per picture from the requested bitrate and frame rate. There is no closed loop and there cannot be one here: a picture's size is known only after the GPU encodes it, and vkCmdEncodeVideoKHR merely records commands. The VA-API encoder for this hardware runs its bit rate control after each frame completes, which that API's synchronisation allows and this one does not, and gen7 has no macroblock-level rate control the hardware drives on its own -- the VA-API driver leaves those MFX_AVC_IMG_STATE fields zero on this generation. Vulkan defines rate control as best effort, and this is the effort. The quantizer comes from a measured curve rather than a guess: sweeping QP 14 to 50 over a 176x144 clip gives 361 bits per macroblock at QP 26 for an I picture and 166 for a P one, halving every 12.5 steps of the quantizer for I and every 10.3 for P. Measured against the target across a 15x range of bitrates, I pictures land between 0.82x and 1.30x, P pictures between 0.59x and 1.56x -- the spread on P is content dependent and nothing open loop can narrow it. A target below about 90 bits per macroblock cannot be met at all, since that is where the curve flattens. dEQP-VK.video.encode.h264 goes from 84 to 92 of 120 with no failures. The remaining 28 are quantization maps, which gen7 has no hardware path for, and B frames. Co-Authored-By: Claude Opus 5 <[email protected]>
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