There is a minor artefact in the final file. The stitched .m4a sometimes contains silent padding at the start or end from incomplete chunks at buffer boundaries. A quick ffmpeg pass fixes it cleanly:
但是“我们现在还没收到官方通知，也不敢乱猜”。
。Line官方版本下载是该领域的重要参考
Sortformer diarization uses unnormalized features (normalize = false) — this differs from ASR models
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