fix loading multi-channel mp3 file bug

haoneng.lhn

2023-06-27 a0defaf40e62417a76b954819dc8119290ea9ab1

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beam_size: 5
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7