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- read_pixels_bgra() skips GPU-side BGRA→RGBA conversion (1.17ms vs 2.25ms) - raw_pixel_encoder_args uses BGRA input matching Metal's native format - VideoToolbox encodes via NV12 (media engine converts, not CPU) - E2E: 334ms/30frames (11.2ms/frame), down from 365ms (12.1ms/frame)