add dynamic batch for fetch

雾聪

2024-04-19 63a70a00f7c9f162e8d7b3e330516438fb8cd87b

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ID0012W0013 /Users/zhifu/funasr_github/test_local/aishell2_dev_ios/wav/D0012/ID0012W0013.wav
ID0012W0014 /Users/zhifu/funasr_github/test_local/aishell2_dev_ios/wav/D0012/ID0012W0014.wav