Update readme_cn.md

Yabin Li

2023-09-01 ae8b4dfa338111f8b8a70ccfc4ef5615a82cbd09

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wget https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/dep_libs/ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz
tar -xvf ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz