Error in setting up gstreamer pipeline in OpenCV Capture function

abhijeet_ghodga — Sat, 14 Sep 2019 13:33:50 GMT

I am using Ubuntu 14.04. The cmake version being used is 2.4 and gstreamer-1.0 is used.

1. When this command is run through command line,
gst-launch-1.0 autovideosrc ! autovideosink

The video is observed on the display with following message in the terminal,

Setting pipeline to PAUSED ...
ERROR: v4l2 capture: unsupported ioctrl!
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock

2. When the cross-compiled application (using CMake) is run through opencv application on the cross platform,

VideoCapture cap("gst-launch-1.0 autovideosrc ! autovideosink");
ERROR: Error opening video stream or file

3. Following is the code:

#include "opencv2/opencv.hpp"
#include <iostream>
using namespace std;
using namespace cv;
int main()
{
VideoCapture cap("gst-launch-1.0 autovideosrc ! autovideosink");
  //cap.open(3);
//VideoCapture cap(VIDIOC_ENUM_FMT);
  // Check if camera opened successfully
if(!cap.isOpened())
{
  cout << "Error opening video stream or file" << endl;
  return -1;
  }

4. Where is the issue?

bhupeshpatil‌

Re: Error in setting up gstreamer pipeline in OpenCV Capture function

igorpadykov — Mon, 16 Sep 2019 12:10:02 GMT

Hi Abhijeet

one can look at gstreamer pipelines examples on

VAR-SOM-MX6 GSTREAM FSLC - Variscite Wiki

on in Linux Guide in nxp linux documentation i.MX Software | NXP

Best regards
igor
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Error in setting up gstreamer pipeline in OpenCV Capture function

Re: Error in setting up gstreamer pipeline in OpenCV Capture function