I point you to this article: https://medium.com/@klintcho/creating-an-open-speech-recognition-dataset-for-almost-any-language-c532fb2bc0cf https://medium.com/@k

I point you to this article: https://medium.com/@klintcho/creating-an-open-speech-recognition-dataset-for-almost-any-language-c532fb2bc0cf https://medium.com/@klintcho/creating-an-open-speech-recogni... It basically describes the thing you mentioned - matching freely available audio books with the source text and using some tools to preprocess the data suitable for ASR training (alignment, splitting).