Upload audio_or_fallback.py

audio_or_fallback.py

@@ -0,0 +1,26 @@
+class AudioOrFallback:
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {"fallback": ("AUDIO",)},
+            "optional": {"audio": ("AUDIO",)},
+        }
+
+    RETURN_TYPES = ("AUDIO",)
+    FUNCTION = "run"
+    CATEGORY = "audio"
+
+    def run(self, fallback, audio=None):
+        try:
+            # VHS passes audio as a lazy callable; the "no audio stream" error is raised when it's called
+            if callable(audio):
+                audio = audio()
+            if audio is not None and audio["waveform"].numel() > 0:
+                return (audio,)
+        except Exception:
+            pass
+        return (fallback,)
+
+
+NODE_CLASS_MAPPINGS = {"AudioOrFallback": AudioOrFallback}
+NODE_DISPLAY_NAME_MAPPINGS = {"AudioOrFallback": "Audio Or Fallback"}