Update app.py

app.py

@@ -51,7 +51,9 @@ def inference(audio_file, model_name, vocals, drums, bass, other, mp3, mp3_bitra
     cmd += f" --filename \"{audio_file}\""
 
     # Run Demucs
+    os.chdir(os.path.dirname(audio_file))  # Change working directory
     demucs.separate.main(shlex.split(cmd))
+    os.chdir(os.path.dirname(__file__))  # Change back to original directory
 
     # Get the output file paths
     output_dir = os.path.join("separated", model_name, os.path.splitext(os.path.basename(audio_file))[0])