Fix video ouput not display

detect.py

@@ -43,7 +43,7 @@ def run(
         project=ROOT / 'runs/detect',  # save results to project/name
         name='exp',  # save results to project/name
         exist_ok=False,  # existing project/name ok, do not increment
-        line_thickness=3,  # bounding box thickness (pixels)
+        line_thickness=2,  # bounding box thickness (pixels)
         hide_labels=False,  # hide labels
         hide_conf=False,  # hide confidences
         half=False,  # use FP16 half-precision inference
@@ -100,9 +100,9 @@ def run(
     
         # NMS
         with dt[2]:
-            pred = pred[0][0] if isinstance(pred[0], list) else pred[0]  # single model or ensemble
+            pred = pred[0][1] if isinstance(pred[0], list) else pred[0]  # single model or ensemble
             pred = non_max_suppression(pred, conf_thres, iou_thres, classes, agnostic_nms, max_det=max_det)
-        
+    
          
         # Second-stage classifier (optional)
         # pred = utils.general.apply_classifier(pred, classifier_model, im, im0s)
@@ -173,7 +173,7 @@ def run(
                         else:  # stream
                             fps, w, h = 30, im0.shape[1], im0.shape[0]
                         save_path = str(Path(save_path).with_suffix('.mp4'))  # force *.mp4 suffix on results videos
-                        vid_writer[i] = cv2.VideoWriter(save_path, cv2.VideoWriter_fourcc(*'h264'), fps, (w, h))
+                        vid_writer[i] = cv2.VideoWriter(save_path, cv2.VideoWriter_fourcc('m','p','4','v'), fps, (w, h))
                     vid_writer[i].write(im0)
 
         # Print time (inference-only)