write .wav in background

qt/aqt/sound.py

@@ -612,6 +612,7 @@ class QtAudioInputRecorder(Recorder):
             showWarning(f"recording failed: {err}")
             return
 
+        def write_file():
             # swallow the first 300ms to allow audio device to quiesce
             wait = int(44100 * self.STARTUP_DELAY)
             if len(self._buffer) <= wait:
@@ -626,7 +627,11 @@ class QtAudioInputRecorder(Recorder):
             wf.writeframes(self._buffer)
             wf.close()
 
-        super().stop(on_done)
+        def and_then(fut):
+            fut.result()
+            Recorder.stop(self, on_done)
+
+        self.mw.taskman.run_in_background(write_file, and_then)
 
 
 # PyAudio recording