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AWS Polly UnsupportedVoiceException
Understanding AWS Polly
AWS Polly is a service provided by Amazon Web Services that turns text into lifelike speech, allowing developers to create applications that can 'speak'. It is widely used in applications that require voice interaction, such as virtual assistants, automated customer service, and more. Polly supports a variety of languages and voices, making it a versatile tool for developers.
Identifying the Symptom
When using AWS Polly, you might encounter an error message stating UnsupportedVoiceException. This error typically occurs when a voice that is not compatible with the selected language is specified in the request. This can halt the text-to-speech conversion process, affecting the application's functionality.
Explaining the Issue
The UnsupportedVoiceException is an error code indicating that the voice you have chosen is not available for the language you are trying to use. AWS Polly offers a range of voices for different languages, but not all voices are available for every language. This mismatch leads to the exception being thrown.
Common Scenarios
This issue often arises when developers are experimenting with different voices and languages or when there is a misunderstanding about the available options for a specific language. It is crucial to verify the compatibility of the voice and language before making a request.
Steps to Resolve the Issue
To resolve the UnsupportedVoiceException, follow these steps:
Step 1: Verify Supported Voices
First, check the list of supported voices for the language you are using. AWS provides a comprehensive list of voices and their supported languages in the AWS Polly Documentation. Ensure that the voice you intend to use is listed under the desired language.
Step 2: Update Your Request
Once you have identified a compatible voice, update your application code to use this voice. For example, if you are using the AWS SDK for JavaScript, your code might look like this:
const AWS = require('aws-sdk');
const polly = new AWS.Polly();
const params = {
Text: 'Hello, world!',
OutputFormat: 'mp3',
VoiceId: 'Joanna' // Ensure 'Joanna' is supported for your language
};
polly.synthesizeSpeech(params, (err, data) => {
if (err) console.log(err, err.stack);
else console.log(data);
});
Step 3: Test the Application
After updating the voice, test your application to ensure that the error is resolved and the text-to-speech functionality works as expected. If the issue persists, double-check the voice and language compatibility.
Conclusion
By following these steps, you can effectively resolve the UnsupportedVoiceException in AWS Polly. Always refer to the AWS Polly Developer Guide for the latest updates and best practices when working with AWS Polly.
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