Update SDK_advanced_guide_online.md

Yabin Li

2023-08-16 a657238ad362142cb5b56c47c26cf294884693a8

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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