"streaming" in this case is like another reply said: transcriptions appear as I talk. Compared to not-streaming in which the service waits for silence, then processes the captured speech, then returns some transcription.
Is your Flutter library available? And does it run locally? I'm looking for a good Flutter streaming (in the sense above) speech recognition library. vosk looks good, but it's lacking some configurability such as selecting audio source.
FONNX, haven't gone out of my way to make it trivial[1], but, it's very good, battle tested on every single platform. (And yes runs locally)
[1] example app shows how to do everything, there's basic doc, but man the amount of nonsense you need to know to pull it all together is just too hard to document without a specific Q. Do feel free to file an issue