# 检测摄像头
 python detect.py  --weights runs/train/exp_yolov5s/weights/best.pt --source 0  # webcam
 # 检测图片文件
  python detect.py  --weights runs/train/exp_yolov5s/weights/best.pt --source file.jpg  # image 
 # 检测视频文件
   python detect.py --weights runs/train/exp_yolov5s/weights/best.pt --source file.mp4  # video
 # 检测一个目录下的文件
  python detect.py --weights runs/train/exp_yolov5s/weights/best.pt path/  # directory
 # 检测网络视频
  python detect.py --weights runs/train/exp_yolov5s/weights/best.pt 'https://youtu.be/NUsoVlDFqZg'  # YouTube video
 # 检测流媒体
  python detect.py --weights runs/train/exp_yolov5s/weights/best.pt 'rtsp://example.com/media.mp4'  # RTSP, RTMP, HTTP stream