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elwrclandClaude Opus 5
30cbb40eb0
MFX_QM_STATE and MFX_FQM_STATE hold separate register sets for the intra and the inter scaling lists, but only the intra ones were programmed. The hardware therefore quantized every inter residual with whatever those registers happened to hold, so a coded P macroblock came back corrupted while I frames were correct. That is why the P path shipped as skip-only. With both sets programmed, P macroblocks can carry a real residual: encode them as coded BP_L0_16x16 with a zero motion vector instead of forcing P_Skip. A P frame now tracks changing content rather than repeating its reference. Measured on a 176x144 clip at QP 26, P frame luma PSNR against the true source: 12.81 dB before, 43.87 dB after (the I frame scores 44.53 dB), at 2062 bytes versus the I frame's 4474. With an unchanged source the P frame costs 67 bytes, down from 4862. dEQP-VK.video.encode.h264.* goes from 12 to 14 passes with no new failures. There is still no motion estimation, so a moving block costs a full residual rather than a motion vector. Co-Authored-By: Claude Opus 5 <[email protected]>
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