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When G729 enable VAD, the sound sounds terrible

Hi, Everyone

My G729 lib version is dm6437_g729abenc_1_12_001_production. I test the Encoder & Decoder compliance with reference input, and all passed. But when I change the input to another input audio, then encode, then decode, and the output sounds terrible. So I was wondering when this would happen? And attached are the ref input and ref output, and my input audio, and the terrible output.

5518.TestVecs.tar

Best regards,

Buga