KaldiRecognizer doesn't decode quiet sounds

I have this audio file that I want to transcribe
[initial8691708938939979847.zip](https://github.com/alphacep/vosk-android-demo/files/4955124/initial8691708938939979847.zip)

VOSK transcribes the audio to just "oh." When I instantiated KaldiRecognizer, I set the sampling rate to the same sampling rate of the audio file, I'm not sure why it is not transcribing the sentence. Is it not loud enough? Google Cloud's speech-to-text transcribed the file properly, so I'm wondering why this issue happens on mobile.

I used Android's MediaRecorder to record the voice clip like this:

`
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_RECOGNITION); recorder.setOutputFormat(AudioFormat.ENCODING_PCM_16BIT);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
recorder.setAudioChannels(1);
recorder.setAudioEncodingBitRate(128000);
recorder.setAudioSamplingRate(48000);
`