Update app_parallel.py

app_parallel.py

@@ -363,8 +363,8 @@ def parallel_processing():
 def stream_results():
     global future_to_chunk
      def generate():
-        for future in as_completed(future_results):
-            idx = future_results.index(future)
+        for future in as_completed(future_to_chunk):
+            idx = future_to_chunk[future]
             try:
                 base64_video, temp_file_path = future.result()
                 yield json.dumps({'start_time': idx, 'path': temp_file_path}).encode('utf-8')