Error when launching QRpi

I got this error when I launch QRpi
Using pipeline:
libcamerasrc ! video/x-raw, width=(int)1024, height=(int)768, framerate=(fraction)15/1 ! videoconvert ! videoscale ! video/x-raw, width=(int)1024, height=(int)768 ! appsink

(QRpi:774): GLib-GObject-WARNING **: 10:25:52.137: invalid cast from 'GstLibcameraSrc' to 'GstBin'

(QRpi:774): GStreamer-CRITICAL **: 10:25:52.137: gst_bin_iterate_elements: assertion 'GST_IS_BIN (bin)' failed

(QRpi:774): GStreamer-CRITICAL **: 10:25:52.137: gst_iterator_next: assertion 'it != NULL' failed

(QRpi:774): GStreamer-CRITICAL **: 10:25:52.137: gst_iterator_free: assertion 'it != NULL' failed

[ WARN:0@0.122] global cap_gstreamer.cpp:1535 open OpenCV | GStreamer warning: cannot find appsink in manual pipeline
[ WARN:0@0.123] global cap_gstreamer.cpp:1173 isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.123] global cap.cpp:204 open VIDEOIO(GSTREAMER): backend is generally available but can't be used to capture by name
Failed to open camera.
I'm worjing on a Pi4 with no desktop environment.
Could you help me, please?

[codewithriza]

Problem

It appears that the error you're encountering is related to the GStreamer pipeline setup using libcamerasrc on your Raspberry Pi 4. The error message suggests an issue with casting GstLibcameraSrc to GstBin.

Solution

One potential solution to address this issue is to encapsulate the libcamerasrc element within a bin in your GStreamer pipeline. Here's an example modification:

#!/bin/bash

gst-launch-1.0 -e libcamerasrc ! video/x-raw, width=1024, height=768, framerate=15/1 ! videoconvert ! videoscale ! video/x-raw, width=1024, height=768 ! appsink

Thank you! If you have any concerns or doubts, please feel free to let me know.

I launch the command and I got this warning: WARNING: erroneous pipeline: no element "videoconvert"
Then I lauch QRpi but I got the same problem

[codewithriza]

It seems that the warning "WARNING: erroneous pipeline: no element 'videoconvert'" indicates that the 'videoconvert' element is not available within your GStreamer installation or configuration.

To resolve this issue, you may need to install the necessary GStreamer plugins or verify if they are properly installed on your system. 'videoconvert' is a part of the GStreamer base plugins and is commonly used for format conversion within GStreamer pipelines.

Try installing the GStreamer base plugins using your system's package manager. For instance, on Debian-based systems, you can use:

sudo apt-get install gstreamer1.0-plugins-base

Replace this command with the appropriate package manager command based on your system.

If 'videoconvert' is already installed or after installing it, if the issue persists, consider modifying the GStreamer pipeline to use an alternative or equivalent element that performs a similar function. For instance, 'autovideoconvert' or 'ffmpegcolorspace' could be viable alternatives.

Modify the pipeline as follows:

libcamerasrc ! video/x-raw, width=(int)1024, height=(int)768, framerate=(fraction)15/1 ! autovideoconvert ! videoscale ! video/x-raw, width=(int)1024, height=(int)768 ! appsink

After making these changes, try running the command again. If the problem persists, providing more details about your system configuration or the specific GStreamer version being used can help in further troubleshooting.