<![CDATA[Error connecting camera via OpenCV]]>Hi, I am developing a Qt Application on a customized yocto-build OS. The Qt Application is expected to stream live camera feed on to the HDMI connected LCD. Here are some further details of the device and error.

OS: Linux imx8mminvsom 5.4.47-1.00-inventron-som+gd8c10bbcd #1 SMP PREEMPT Thu May 11 12:56:07 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

I am reading the image using:
```

VideoCapture cap(0);
Mat frame = imread("/opt/DSv2/bin/Lab.png");

//    Check if the camera opened successfully
if (!cap.isOpened()) {
        qDebug() << "Error: Could not open camera";
        cap.release();
}

ERROR:

[ WARN:0] global /usr/src/debug/opencv/4.4.0.imx-r0/git/modules/videoio/src/cap_gstreamer.cpp (1760) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Internal data stream error.
[ WARN:0] global /usr/src/debug/opencv/4.4.0.imx-r0/git/modules/videoio/src/cap_gstreamer.cpp (888) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0] global /usr/src/debug/opencv/4.4.0.imx-r0/git/modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
Error: Could not open camera

Any help regarding solving this issue would be appreciated.

]]>https://forum.qt.io/topic/154816/error-connecting-camera-via-opencvRSS for NodeFri, 05 Jun 2026 22:04:19 GMTThu, 22 Feb 2024 08:13:08 GMT60<![CDATA[Reply to Error connecting camera via OpenCV on Mon, 26 Feb 2024 20:45:22 GMT]]>@mtalha2621 My bad, I misread the error messages. What I had in mind when answering is for you to use your custom pipeline with OpenCV.

]]>https://forum.qt.io/post/791457https://forum.qt.io/post/791457Mon, 26 Feb 2024 20:45:22 GMT<![CDATA[Reply to Error connecting camera via OpenCV on Mon, 26 Feb 2024 05:35:07 GMT]]>@SGaist OpenCV is using GStreamer. As you can see in my question, OpenCV is returning GStreamer error. I have tried multiple pipelines but same result has been found.

]]>https://forum.qt.io/post/791368https://forum.qt.io/post/791368Mon, 26 Feb 2024 05:35:07 GMT<![CDATA[Reply to Error connecting camera via OpenCV on Thu, 22 Feb 2024 20:06:22 GMT]]>@mtalha2621 you can tell OpenCV to use GStreamer (if the support has been built).

See this thread on the OpenCV forum.

]]>https://forum.qt.io/post/791047https://forum.qt.io/post/791047Thu, 22 Feb 2024 20:06:22 GMT<![CDATA[Reply to Error connecting camera via OpenCV on Thu, 22 Feb 2024 10:35:21 GMT]]>@Vijaykarthikeyan it is not a webcam. It is a MIPI CSI Camera ov5645_mipi

I have verified the connection of camera via
timeout -s INT 10s gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw,width=1920,height=1080,framerate=30/1' ! waylandsink

It is working. But I am getting error in capturing via OpenCV in Qt Application

]]>https://forum.qt.io/post/790997https://forum.qt.io/post/790997Thu, 22 Feb 2024 10:35:21 GMT<![CDATA[Reply to Error connecting camera via OpenCV on Thu, 22 Feb 2024 09:00:15 GMT]]>@mtalha2621 check the webcam whether it is accessible

]]>https://forum.qt.io/post/790980https://forum.qt.io/post/790980Thu, 22 Feb 2024 09:00:15 GMT