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When a client requests a bitrate above the GPU's HEVC/AV1 level ceiling, NVENC rejects initialize_encoder. The old probe stepped the rate down by ×¾ each retry, undershooting the real ceiling badly (a 1 Gbps request landed ~300 Mbps even with the level cap near 800). Replace it with a binary search over [floor, requested] that converges (±20 Mbps) on the HIGHEST rate NVENC accepts and clamps to that — so the stream uses the full codec-level bitrate. Factored the session open/config/init into try_open_session() for the probe; split-encode rejection is disambiguated from a bitrate-cap rejection (retry once with split disabled) and the floor fallback also tries split-disabled. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>