How can I resolve the issue of GStreamer GTK app not properly displaying an rtsp stream, showing only a black screen?

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You can try the following solutions to resolve the issue of GStreamer GTK app not properly displaying an rtsp stream, showing only a black screen:

1. Check if the rtsp stream is working properly by using a different media player or browser. If it's not working, then there might be an issue with the rtsp stream itself.

2. Check if the GStreamer plugins are installed and properly configured. You can check by running the following command in the terminal:

   gst-inspect-1.0 | grep rtsp

   If the output shows "rtspsrc", then the plugins are installed properly.

3. Try changing the video sink element in the GStreamer pipeline. You can try using "xvimagesink" instead of "autovideosink". To do this, add the following option to the GStreamer pipeline:

   video-sink=xvimagesink

4. Try changing the video format of the rtsp stream. Some GStreamer plugins might not support certain video formats. You can try changing the video format to H.264, which is widely supported by GStreamer. To do this, add the following option to the GStreamer pipeline:

   rtph264depay ! h264parse ! avdec_h264

5. Try increasing the buffer size of the rtsp stream. The buffer size determines how much data is buffered before it's displayed on the screen. You can increase the buffer size by adding the following options to the GStreamer pipeline:

   latency=500 buffer-size=500 ! rtph264depay ! h264parse ! avdec_h264

   Change the values of latency and buffer-size to higher values if necessary.

Hopefully, one of these solutions will resolve the issue of GStreamer GTK app not properly displaying an rtsp stream, showing only a black screen.