Hi Team, I have a usecase where I want to process frames into opencv and simoultaneouly display the frame into a flask web app i.e. web browser using a on board CSI camera(raspberry pi camera v2) on jetson nano. I am trying to do it using gstreamer but not able to accomplish the end goal. The blockers are : How to display stream from csi camera to browser ? I looked into some ways using vlc plugin but i am not able to build VLC from source . The make commands ends in an error after fixing a lot of errors i.e. codec/jpeg.c:667:5: error: implicit declaration of function ‘jpeg_mem_dest’; did you mean ‘jpeg_stdio_dest’? [-Werror=implicit-function-declaration] jpeg_mem_dest(&p_sys->p_jpeg, &p_block->p_buffer, &size); Anybody has successfully installed VLC on jetson nano ? The other ways I came across is using WebRTC which require to implement all components of it. I did not deeply explore it but if it is the only way and it works i will definitely look into it. How to simoultaneously read frames in opencv and web browser ? I tried a couple of UDP source pipelines and am able to create multiple xvimagesink’s but not sure how to do it in browser and opencv together. The UDP server command: gst-launch-1.0 nvarguscamerasrc ! nvvidconv flip-method=0 ! ‘video/x-raw(memory:NVMM), width=(int)640, height=(int)480, format=(string)I420, framerate=(fraction)30/1’ ! omxh264enc control-rate=2 bitrate=4000000 ! ‘video/x-h264, stream-format=(string)byte-stream’ ! h264parse ! rtph264pay mtu=1400 ! udpsink host=0.0.0.0 port=5000 sync=false async=false The receiver for this server: gst-launch-1.0 udpsrc port=5000 ! application/x-rtp,encoding-name=H264,payload=96 ! rtph264depay ! h264parse ! queue ! avdec_h264 ! tee name=t t. ! queue ! xvimagesink t. ! queue ! xvimagesink Final question is that is this usecase achievable on jetson nano with raspi camera v2 ? If yes, then any guidance would be helpful ! Thanks in advance .

Thanks for the reply but appsink will not work for our usecase. We did it a workaround using multiple v4l2sinks and creating virtual camera using v4l2loopback.

Hi, There is a sample of showing video preview: [image] OpenCV Video Capture with GStreamer doesn't work on ROS-melodic Jetson TX2 Hi, Once you confirm the source is valid, you may also try this simple code: import sys import cv2 def read_cam(): cap = cv2.VideoCapture("nvarguscamerasrc ! video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080,format=(string)NV12, framerate=(fraction)30/1 ! nvvidconv ! video/x-raw, format=(string)BGRx ! videoconvert ! appsink") if cap.isOpened(): cv2.namedWindow("demo", cv2.WINDOW_AUTOSIZE) while True: ret_val, img = cap.read(); cv2.ims… Your usecase is advancing and we don’t have experience on it. We would suggest go to OpenCV forum to get further help.

Hi, Good to know you have a solution and thanks for sharing it.

CSI camera input to opencv and browser simoultaneously

Robotics & Edge Computing Jetson Systems Jetson Nano

DaneLLL October 16, 2020, 9:19am 3

Hi,
There is a sample of showing video preview:

Your usecase is advancing and we don’t have experience on it. We would suggest go to OpenCV forum to get further help.

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CSI camera input to opencv and browser simoultaneously

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