Error launching postured: Camera index out of range

[ebarped]

I've got this error launching the app:

[ WARN:0@0,764] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video1): can't open camera by index
ioctl(VIDIOC_QBUF): Bad file descriptor
[ WARN:0@1,628] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video3): can't open camera by index
ioctl(VIDIOC_QBUF): Bad file descriptor
[ WARN:0@1,972] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video4): can't open camera by index
[ WARN:0@1,980] global cap.cpp:438 open VIDEOIO(FFMPEG): raised OpenCV exception:

OpenCV(4.13.0) /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:1220: error: (-2:Unspecified error) in function 'bool CvCapture_FFMPEG::open(const char*, int, const cv::Ptr<cv::IStreamReader>&, const cv::VideoCaptureParameters&)'
> VIDEOIO/FFMPEG: Camera index out of range (expected: 'index < device_list->nb_devices'), where
>     'index' is 4
> must be less than
>     'device_list->nb_devices' is 4


[ERROR:0@1,981] global obsensor_uvc_stream_channel.cpp:163 getStreamChannelGroup Camera index out of range
[ WARN:0@1,982] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video5): can't open camera by index
[ WARN:0@1,982] global cap.cpp:438 open VIDEOIO(FFMPEG): raised OpenCV exception:

OpenCV(4.13.0) /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:1220: error: (-2:Unspecified error) in function 'bool CvCapture_FFMPEG::open(const char*, int, const cv::Ptr<cv::IStreamReader>&, const cv::VideoCaptureParameters&)'
> VIDEOIO/FFMPEG: Camera index out of range (expected: 'index < device_list->nb_devices'), where
>     'index' is 5
> must be less than
>     'device_list->nb_devices' is 4


[ERROR:0@1,983] global obsensor_uvc_stream_channel.cpp:163 getStreamChannelGroup Camera index out of range
[ WARN:0@1,983] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video6): can't open camera by index
[ WARN:0@1,984] global cap.cpp:438 open VIDEOIO(FFMPEG): raised OpenCV exception:

OpenCV(4.13.0) /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:1220: error: (-2:Unspecified error) in function 'bool CvCapture_FFMPEG::open(const char*, int, const cv::Ptr<cv::IStreamReader>&, const cv::VideoCaptureParameters&)'
> VIDEOIO/FFMPEG: Camera index out of range (expected: 'index < device_list->nb_devices'), where
>     'index' is 6
> must be less than
>     'device_list->nb_devices' is 4


[ERROR:0@1,984] global obsensor_uvc_stream_channel.cpp:163 getStreamChannelGroup Camera index out of range
[ WARN:0@1,985] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video7): can't open camera by index
[ WARN:0@1,985] global cap.cpp:438 open VIDEOIO(FFMPEG): raised OpenCV exception:

OpenCV(4.13.0) /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:1220: error: (-2:Unspecified error) in function 'bool CvCapture_FFMPEG::open(const char*, int, const cv::Ptr<cv::IStreamReader>&, const cv::VideoCaptureParameters&)'
> VIDEOIO/FFMPEG: Camera index out of range (expected: 'index < device_list->nb_devices'), where
>     'index' is 7
> must be less than
>     'device_list->nb_devices' is 4


[ERROR:0@1,986] global obsensor_uvc_stream_channel.cpp:163 getStreamChannelGroup Camera index out of range
[ WARN:0@1,986] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video8): can't open camera by index
[ WARN:0@1,986] global cap.cpp:438 open VIDEOIO(FFMPEG): raised OpenCV exception:

OpenCV(4.13.0) /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:1220: error: (-2:Unspecified error) in function 'bool CvCapture_FFMPEG::open(const char*, int, const cv::Ptr<cv::IStreamReader>&, const cv::VideoCaptureParameters&)'
> VIDEOIO/FFMPEG: Camera index out of range (expected: 'index < device_list->nb_devices'), where
>     'index' is 8
> must be less than
>     'device_list->nb_devices' is 4


[ERROR:0@1,987] global obsensor_uvc_stream_channel.cpp:163 getStreamChannelGroup Camera index out of range
[ WARN:0@1,987] global cap_v4l.cpp:914 open VIDEOIO(V4L2:/dev/video9): can't open camera by index
[ WARN:0@1,987] global cap.cpp:438 open VIDEOIO(FFMPEG): raised OpenCV exception:

OpenCV(4.13.0) /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:1220: error: (-2:Unspecified error) in function 'bool CvCapture_FFMPEG::open(const char*, int, const cv::Ptr<cv::IStreamReader>&, const cv::VideoCaptureParameters&)'
> VIDEOIO/FFMPEG: Camera index out of range (expected: 'index < device_list->nb_devices'), where
>     'index' is 9
> must be less than
>     'device_list->nb_devices' is 4

I fixed it by installing this package: sudo apt install v4l-utils