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:
{ antialias: true }：开启了抗锯齿，让边缘光滑，不再有毛刺。
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The workers described being threatened and beaten, having their passports withheld, and being forced to work long hours in unsanitary conditions.
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