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The plan's -1 dBTP check ran one single-threaded ebur128 pass over the whole mix. It now scans fixed segments in parallel and reports the same printed value: each later segment starts one 100 ms block early and drops that block (the oversampler's mirrored start can invent a peak, and a scan never measures its last 16 samples); the last segment falls back to one whole-file pass when its dropped block alone could be the loudest. Segments decode from the file start, since the AAC decoder carries noise-substitution state.