Error "V4L2: Pixel format of incoming image is unsupported by OpenCV"

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

I build the source code as a ROS-NODE, and i rosrun the node in TX2 board
there is a Error :
Error “V4L2: Pixel format of incoming image is unsupported by OpenCV”
ERROR! Unable to open camera

what is the problem?
I use ROS-kinetic

ros build is completed correctly

source code is :

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{

//VideoCapture cap(“nvcamerasrc ! video/x-raw(memory:NVMM), width=(int)1280, height=(int)720,format=(string)I420, framerate=(fraction)24/1 ! nvvidconv flip-method=2 ! video/x-raw, format=(string)BGRx ! videoconvert ! video/x-raw, format=(string)BGR ! appsink”);
//Mat frame;
//— INITIALIZE VIDEOCAPTURE
VideoCapture cap(0);
// open the default camera using default API
//cap.open(-1);
// OR advance usage: select any API backend
//int deviceID = -1; // 0 = open default camera
//int apiID = cv::CAP_ANY; // 0 = autodetect default API
// open selected camera using selected API
//cap.open(deviceID + apiID);
// check if we succeeded
if (!cap.isOpened()) {
cerr << “ERROR! Unable to open camera\n”;
return -1;
}

cout << “Start grabbing” << endl
<< “Press any key to terminate” << endl;

for(;;)
{ Mat frame;
// wait for a new frame from camera and store it into ‘frame’
cap.read(frame);
// check if we succeeded
if (frame.empty()) {
cerr << “ERROR! blank frame grabbed\n”;
break;
}
// show live and wait for a key with timeout long enough to show images
imshow(“TJUAE”, frame);
if (waitKey(5) >= 0)
break;
}
return 0;
}

2

Could you see the result of

v4l2-ctl -d /dev/video0 --list-formats
3

Thanks for your reply!
I can not see the result of the command above

terminal showed the message below

“v4l2-ctl: command not found”

4

Please install v4l-utils through apt-get.

5

Thanks!
I installed v4l-utils and then i saw the result of “v4l2-ctl -d /dev/video0 --list-formats”

the result is :

ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: ‘RGGB’
Name : 8-bit Bayer RGRG/GBGB

Index       : 1
Type        : Video Capture
Pixel Format: 'RG10'
Name        : 10-bit Bayer RGRG/GBGB

Index       : 2
Type        : Video Capture
Pixel Format: 'BG10'
Name        : 10-bit Bayer BGBG/GRGR

Index       : 3
Type        : Video Capture
Pixel Format: 'RG12'
Name        : 12-bit Bayer RGRG/GBGB

But there is still a problem:
I can see the image when i use cap(1), it will use my USB camera.

but can’t open the camera on the TX2 board.

6

Is your CSI camera working good by using gstreamer or argus app?

7

Take a look at this link:

I’ve run into this issue as well. Will try the fix when I get time - let me know if it works for you.

8

I have the same problem, the call to v4l2-ctl -d /dev/video0 --list-formats gives the same answer on my Jetson TX2 as above but on my PC with Ubuntu 16.04 it says

ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format : ‘YUYV’
Name : YUYV 4:2:2

Index : 1
Type : Video Capture
Pixel Format : ‘MJPG’ (compressed)
Name : Motion-JPEG

When I use the instruction cv::VideoCapture.set(CV_CAP_PROP_FOURCC, CV_FOURCC(‘Y’, ‘1’, ‘6’, ’ ')); I get the answer VIDEOIO ERROR: V4L2: setting property #6 not supported

Note that I am using a Tara stereo camera from e-con Systems and openCV-3.1.0, which is required by their SDK

Basically the images I am getting are rubbish, any idea ?

9

Hi thierry-arlandis,

Does your OpenCV-3.1.0 build with “-D WITH_LIBV4L=ON”?

10

Hello

Yes sorry, that was my fault: I forgot to include the v4l patch supplied by e-con Systems which sorts everything out.

11

Hi,
I’m getting the same issue.

Here is the output of

v4l2-ctl -d /dev/video0 --list-formats

is

ioctl: VIDIOC_ENUM_FMT
	Index       : 0
	Type        : Video Capture
	Pixel Format: 'RGGB'
	Name        : 8-bit Bayer RGRG/GBGB

	Index       : 1
	Type        : Video Capture
	Pixel Format: 'RG10'
	Name        : 10-bit Bayer RGRG/GBGB

	Index       : 2
	Type        : Video Capture
	Pixel Format: 'BG10'
	Name        : 10-bit Bayer BGBG/GRGR

	Index       : 3
	Type        : Video Capture
	Pixel Format: 'RG12'
	Name        : 12-bit Bayer RGRG/GBGB

I did cmake with following option:

D WITH_LIBV4L=ON

Following is build_information part for videoio:

--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  NO
--     FFMPEG:                      YES
--       avcodec:                   YES (ver 56.60.100)
--       avformat:                  YES (ver 56.40.101)
--       avutil:                    YES (ver 54.31.100)
--       swscale:                   YES (ver 3.1.101)
--       avresample:                NO
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     OpenNI2:                     NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     Aravis SDK:                  NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    NO/YES
--     XIMEA:                       NO
--     Xine:                        NO
--     Intel Media SDK:             NO
--     gPhoto2:                     NO

Let me know where I’m doing wrong

12

@thierry-arlandis

I have same issue. Could you share how did you install e-con Systems v4l patch? Thank you very much.