Fix: Return tuple ('', []) when char_list is empty to prevent ValueError (#...

lingji-yidong

2024-06-28 c880db53646ab9fd26417f4baf004ab44cc24e1a

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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