Update app.py

app.py

@@ -97,15 +97,24 @@ def apply_vocal_isolation(audio_path):
 
 # === Preset Loader ===
 def load_presets():
-    preset_files = [f for f in os.listdir("presets") if f.endswith(".json")]
-    presets = {}
-    for f in preset_files:
-        with open(os.path.join("presets", f)) as infile:
-            data = json.load(infile)
-            presets[data["name"]] = data["effects"]
-    return presets
-
-preset_choices = load_presets()
+    try:
+        preset_files = [f for f in os.listdir("presets") if f.endswith(".json")]
+        presets = {}
+        for f in preset_files:
+            path = os.path.join("presets", f)
+            try:
+                with open(path, "r") as infile:
+                    data = json.load(infile)
+                    if "name" in data and "effects" in data:
+                        presets[data["name"]] = data["effects"]
+                    else:
+                        print(f"Invalid format in {f}")
+            except json.JSONDecodeError:
+                print(f"Failed to parse {f} — invalid JSON")
+        return presets
+    except FileNotFoundError:
+        print("Presets folder not found")
+        return {}
 
 # === Main Processing Function ===
 def process_audio(audio_file, selected_effects, isolate_vocals, preset_name):