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Oleksandr Bezdieniezhnykh
251ebed1c2
Wires a real ffmpeg-next 8.1 decoder into the frame_ingest lifecycle loop. NVDEC is probed at runtime via h264_cuvid / hevc_cuvid; CUDA-less hosts transparently fall back to software h264 / hevc. Each decoded frame is stamped with capture_ts (taken at packet receipt) and decode_ts (taken after decode returns) so movement_detector sees accurate frame-arrival times. Single-frame decode errors are counted toward decode_errors_total and dropped; the stream is never aborted. Adds new public API on FrameIngestHandle: decoder_backend(), decode_errors_total(), frames_decoded_total(), decode_ms_first_frame(), decode_ms_p50(), decode_ms_p99(). Integration tests under crates/frame_ingest/tests/decoder_pipeline.rs cover AC-1, AC-3, AC-4 end-to-end through the real FfmpegDecoder using libx264-encoded synthetic streams; AC-2 positive (NVDEC selection) is opt-in via --ignored on a CUDA host. AZ-657 lifecycle tests retained via a StubDecoder. Co-authored-by: Cursor <cursoragent@cursor.com>