On the ARM board installation ubuntu16, compiler installed OPENCV4.1.1 + CONTRIB, compile has identified before
Video I/O:
DC1394: NO
FFMPEG: YES
Avcodec: YES (58.35.100)
Avformat: YES (58.20.100)
Avutil: YES (56.22.100)
Swscale: YES (5.3.100)
Avresample: NO
GStreamer: NO
V4l/v4l2: YES (Linux/videodev2. H)
But I perform error:
CV: : VideoCapture cap;
Cap. Open (" RTSP://admin: 12345 @192.168.2.231:554/mpeg-4/ch1/main/av_steam ");



[ERROR: 1) global/media/debian/ubuntu - ext/opencv_ubuntu opencv411/modules/videoio/SRC/cap. The CPP (116), the open videoio (CV_IMAGES) : raised OpenCV exception:

OpenCV (4.4.1)/media/debian/ubuntu - ext/opencv_ubuntu opencv411/modules/videoio/SRC/cap_images CPP: 253: error: (5: Bad argument) cap_images: can 't find starting number (in the name of the file) : RTSP://admin: 12345 @192.168.2.231:554/mpeg-4/ch1/sub/av_steam function in' icvExtractPattern '

How to solve ah, have several days