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To ensure that the audio recorded by MediaRecorder API in React can be transcribed by Google's speech-to-text service without resulting in an empty output, you should follow these best practices:

1. Ensure that the audio quality is good enough. Poor audio quality can lead to inaccurate transcription or empty output. Make sure that the recording is clear, without any background noise or interference that can affect speech recognition.

2. Send the audio file in a compatible format. The Speech-to-Text API supports audio files in several formats, including WAV, FLAC, and MP3. Ensure that the file format you use is compatible with the API.

3. Use appropriate encoding settings. The encoding settings used when saving the audio file can impact the quality of the audio and its suitability for speech recognition. Ensure that the encoding settings are optimized for speech recognition.

4. Add appropriate metadata. Adding metadata such as language, accent, and recording environment can help improve transcription accuracy.

5. Use appropriate language models. Google's Speech-to-Text API supports different language models optimized for specific use cases. Ensure that you're using the appropriate language model for your use case.

6. Check for errors in the response. Sometimes, despite following all best practices, the transcription may still result in an empty output. In such cases, check for any errors in the response and make appropriate adjustments to improve transcription accuracy.