Dear Kristian,
Thank you for your question.
At the moment, librosa.stream only works for single-file recordings, and does not offer a simple way to "stitch" multiple files together while streaming them.
That being said, you can combine files offline with pysox.combine
On a more personal leve, i am curious what your use case is? As a matter of fact, i also need to process large volumes of audio, because i work with bio-acousticians on migration monitoring.
Feel free to write an email to me if you wish to share more about your research.
Sincerely,
Vincent.