return null for 2pass other wav_format

雾聪

2023-08-29 3a32a6e878b393a4b2029ae9cff24adda38011e4

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