Amazon Polly, an AI generated text-to-speech service, enables you to automate and scale your interactive voice solutions, helping to improve productivity and reduce costs.
As our customers continue to use Amazon Polly for its rich set of features and ease of use, we have observed a demand for the ability to simultaneously generate synchronized audio and subtitles or closed captions for a given text input. At AWS, we continuously work backward from our customer asks, so in this post, we outline a method to generate audio and subtitles at the same time for a given text.
Although subtitles and captions are often used interchangeably, including in this post, there are subtle differences among them:

Subtitles – In subtitles, text language displayed on the screen is different from the audio language and doesn’t display anything for non-dialogue like significant sounds. The primary objective is to reach the audience that

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