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The SDR-to-HDR extraction tests synthesize their HDR fixture with -color_trc/-color_primaries flags and rely on the encoder propagating them into the bitstream. The pinned Windows CI ffmpeg build drops the transfer on that path, so after #2377 narrowed HDR detection to the transfer function, the fixture probes as SDR on Windows and both tests fail (hdrPreflightCount 0). Write the VUI directly with the h264_metadata bitstream filter so the tag survives on every build.