hi, i get some problem of transfer image from realsense to jetson nano. i can run on python to get usb image from this code.
# create video sources & outputs
input = videoSource(args.input, argv=sys.argv)
output = videoOutput(args.output, argv=sys.argv)
# process frames until EOS or the user exits
while True:
# capture the next image
img = input.Capture()
if img is None: # timeout
continue
i think this is same as usb to send the image to jetson nano,i select /dev/video4 that can run RGB image.
but when i use jupyter to use this code
ls -Itrh /dev/video*
/dev/video0 /dev/video1 /dev/video2 /dev/video3 /dev/video4 /dev/video5
from jetcam.usb_camera import USBCamera
camera = USBCamera(width=640, height=480, capture_width=640, capture_height=480, capture_device=4)
[ WARN:0] global /home/ubuntu/build_opencv/opencv/modules/videoio/src/cap_gstreamer.cpp (1100) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
I got this warning and can’t not show the image. so is the jetcam function problem or just some seting i set wrong. i want to use this camera because i want to get depth information. logical 270 can’t get this information.
Hi,
Please try the samples:
V4l2src using OpenCV Gstreamer is not working in Jetson Xavier NX - #3 by DaneLLL
If this sample works, you can refer to it and check why your sample does not work properly.
I can see the image from your sample but there is some information and same warning. General configuration
for OpenCV 4.5.4 =====================================
Version control: 4.5.4-8-g3e4c170df4
Platform:
Timestamp: 2022-01-18T10:01:01Z
Host: Linux 5.10.65-tegra aarch64
CMake: 3.16.3
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: Release
CPU/HW features:
Baseline: NEON FP16
C/C++:
Built as dynamic libs?: YES
C++ standard: 11
C++ Compiler: /usr/bin/c++ (ver 9.3.0)
C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/bin/cc
C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed
Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed
ccache: NO
Precompiled headers: NO
Extra dependencies: dl m pthread rt
3rdparty dependencies:
OpenCV modules:
To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python2 python3 stitching ts video videoio
Disabled: world
Disabled by dependency: -
Unavailable: java
Applications: tests perf_tests examples apps
Documentation: NO
Non-free algorithms: NO
GUI: GTK2
GTK+: YES (ver 2.24.32)
GThread : YES (ver 2.64.6)
GtkGlExt: NO
Media I/O:
ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 80)
WEBP: build (ver encoder: 0x020f)
PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.37)
TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
JPEG 2000: build (ver 2.4.0)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES
Video I/O:
FFMPEG: YES
avcodec: YES (58.54.100)
avformat: YES (58.29.100)
avutil: YES (56.31.100)
swscale: YES (5.5.100)
avresample: YES (4.0.0)
GStreamer: YES (1.16.2)
v4l/v4l2: YES (linux/videodev2.h)
Parallel framework: TBB (ver 2020.1 interface 11101)
Trace: YES (with Intel ITT)
Other third-party libraries:
Lapack: NO
Eigen: YES (ver 3.3.7)
Custom HAL: YES (carotene (ver 0.0.1))
Protobuf: build (3.5.1)
Python 2:
Interpreter: /usr/bin/python2.7 (ver 2.7.18)
Libraries: /usr/lib/aarch64-linux-gnu/libpython2.7.so (ver 2.7.18)
numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.16.5)
install path: lib/python2.7/dist-packages/cv2/python-2.7
Python 3:
Interpreter: /usr/bin/python3 (ver 3.8.10)
Libraries: /usr/lib/aarch64-linux-gnu/libpython3.8.so (ver 3.8.10)
numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.17.4)
install path: lib/python3.8/dist-packages/cv2/python-3.8
Python (for build): /usr/bin/python2.7
Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO
Install to: /usr
-----------------------------------------------------------------
[ WARN:0] global /home/ubuntu/build_opencv/opencv/modules/videoio/src/cap_gstreamer.cpp (1100) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
but i cant receive any image showed from this code on jupyter lab
from jetcam.usb_camera import USBCamera
camera = USBCamera(width=640, height=480, capture_width=640, capture_height=480, capture_device=5)
image = camera.read()
print(image.shape)
print(camera.value.shape)
import ipywidgets
from IPython.display import display
from jetcam.utils import bgr8_to_jpeg
image_widget = ipywidgets.Image(format='jpeg')
image_widget.value = bgr8_to_jpeg(image)
display(image_widget)
output:
Image(value=b'\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00C\x00\x02\x01\x0…
i dont know why i can run your sample to read on CV2 but can’t read for image_widget but there are only value no image