argus and opencv

Autonomous Machines Jetson & Embedded Systems Jetson TX1
#1

hey,

does it’s possible to read a video file and pass it through opencv by using the argus library?

Furthermore as I am using an ip Camera (I already save the video to a file), the argus library would need to not stop reading frame even though the file is being written.

Do you think it’s possible?

Thanks in advance.

#2

Please refer to this thread.

https://devtalk.nvidia.com/default/topic/1037863/jetson-tx2/argus-and-opencv/

#3

the problem is that I do not have any CSI camera as I am using ip Camera so it’s hard to understand argus and cuda without being able to even test it.

02_video_dec_cuda is what I want to do but I am stuck on passing the image to opencv or do the opposite by changing 09_camera_jpeg_capture to accept a file input.

What would be the relevant lines of code that I could write in 02_video_dec_cuda to have a exploitable image in opencv ?

#4

Hi blitzfr,
Please refer to
https://devtalk.nvidia.com/default/topic/1037863/jetson-tx2/argus-and-opencv/post/5273400/#5273400

You can check:

+    void *pdata = NULL;
+
+    NvBufferMemMap(fd, 0, NvBufferMem_Read, &pdata);
+    NvBufferMemSyncForCpu(fd, 0, &pdata);
+
+    cv::Mat imgbuf = cv::Mat(PREVIEW_SIZE.height(),
+                             PREVIEW_SIZE.width(),
+                             CV_8UC4, pdata);
+    cv::Mat display_img;
+    cvtColor(imgbuf, display_img, CV_RGBA2BGR);
+
+    NvBufferMemUnMap(fd, 0, &pdata);
+
+    cv::imshow("img", display_img);
+    cv::waitKey(1);

It shows how to map NvBuffer to cv::Mat.