Which system do you use? Android, Ubuntu, OOWOW or others?
**Ubuntu**
Which version of system do you use? Khadas official images, self built images, or others?
**latest**
Please describe your issue below:
**编译完成后无法进行demo演示**
Post a console log of your issue below:
khadas@Khadas:~/opencv_npu/OpenCV_NPU_Demo/cpp_demo/build$ ./detect-camera 1 ../../model/yunet_int8.onnx
[ WARN:0@0.019] global /home/khadas/opencv_npu/opencv/modules/videoio/src/cap_v4l.cpp (982) open VIDEOIO(V4L2:/dev/video1): can't open camera by index
[ERROR:0@0.031] global /home/khadas/opencv_npu/opencv/modules/videoio/src/cap_obsensor/obsensor_uvc_stream_channel.cpp (150) getStreamChannelGroup Camera index out of range
Cannot open the camera.