Google Speech Invalid sample rate

The audio sample rate is not supported.

Understanding Google Speech API

Google Speech API is a powerful tool that enables developers to convert audio to text by applying neural network models in an easy-to-use API. It supports various languages and can be integrated into applications to enhance user interaction through voice recognition.

Identifying the Symptom: Invalid Sample Rate

When using the Google Speech API, you might encounter an error message indicating an 'Invalid sample rate'. This error typically arises when the audio file you are trying to process has a sample rate that is not supported by the API.

Exploring the Issue: Unsupported Audio Sample Rate

The 'Invalid sample rate' error occurs because the audio file's sample rate does not match the supported rates by Google Speech API. The API requires audio files to be in specific sample rates, such as 16kHz, to ensure accurate processing and transcription.

Common Supported Sample Rates

  • 8kHz
  • 16kHz
  • 32kHz
  • 44.1kHz
  • 48kHz

Steps to Resolve the Invalid Sample Rate Issue

To fix the 'Invalid sample rate' error, you need to convert your audio file to a supported sample rate. Below are the steps to achieve this:

Step 1: Check the Current Sample Rate

First, verify the current sample rate of your audio file. You can use tools like FFmpeg to check the sample rate:

ffmpeg -i your_audio_file.wav

Look for the 'Hz' value in the output to determine the current sample rate.

Step 2: Convert the Audio Sample Rate

Once you know the current sample rate, use FFmpeg to convert it to a supported rate, such as 16kHz:

ffmpeg -i your_audio_file.wav -ar 16000 converted_audio_file.wav

This command changes the sample rate to 16kHz, which is compatible with Google Speech API.

Step 3: Verify the Conversion

After conversion, verify the new sample rate to ensure it matches the required specifications:

ffmpeg -i converted_audio_file.wav

Confirm that the 'Hz' value is now 16000.

Conclusion

By following these steps, you can resolve the 'Invalid sample rate' error and ensure your audio files are compatible with Google Speech API. For more detailed information, refer to the Google Speech-to-Text Documentation.

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