make_video: resolve audio port value robustly

The executor strips 'path' when re-serializing the audio dict between
nodes; accept path/name keys, /gradio_api/file= URLs, or download http(s)
URLs to a temp file.

app.py

@@ -715,11 +715,35 @@ def generate_song(lyrics: str, global_meta: str, vocal_details: str, arrangement
         raise gr.Error(_friendly_gpu_error(e)) from e
 
 
+def _audio_to_path(audio):
+    # The executor re-serializes port values between nodes, so the audio may arrive as a
+    # plain path, a file dict with path/name, or a URL-only dict (path stripped).
+    if isinstance(audio, str):
+        return audio
+    if isinstance(audio, dict):
+        for key in ("path", "name"):
+            if audio.get(key) and os.path.exists(audio[key]):
+                return audio[key]
+        url = audio.get("url") or ""
+        if url.startswith("/gradio_api/file="):
+            return url.split("/gradio_api/file=", 1)[1]
+        if url:
+            import urllib.request
+
+            suffix = os.path.splitext(url.split("?")[0])[1] or ".wav"
+            dst = os.path.join(tempfile.gettempdir(), f"mm3_in_{os.urandom(8).hex()}{suffix}")
+            urllib.request.urlretrieve(url, dst)
+            return dst
+    return None
+
+
 def make_video(audio, title: str):
-    """Render the share visualizer for a generated song. `audio` is the audio port dict."""
+    """Render the share visualizer for a generated song. `audio` is the audio port value."""
     if not audio:
         raise gr.Error("Generate a song first — make_video needs the Output Song audio.")
-    wav_path = audio["path"] if isinstance(audio, dict) else audio
+    wav_path = _audio_to_path(audio)
+    if not wav_path or not os.path.exists(wav_path):
+        raise gr.Error("Could not resolve the audio from the previous node — re-run generate_song.")
     out_path = render_video(wav_path, (title or "").strip() or "Untitled")
     return _save_file(out_path, "minimax-music3-share.mp4", "video/mp4")