数据来源：中国苹果产业协会、国家苹果产业技术体系《中国苹果产业发展报告》
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:。关于这个话题，搜狗输入法2026提供了深入分析
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union alloc_header{