Update README.md

ShiLiang Zhang

2023-12-29 a2c46d612329f5cbf513d5f14e6938bb1ef56b06

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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