The issue with the gst-streammux is causing the issue in running the deepstream-lpr-app
Any help on how to test the license plate detection with proper input video to enter would be of great help.
The models used in this application is to recognise car license characters. Seems you have choose to identify Chinese car license, so you can take any video where there are cars with Chinese licenses.
At most 128 input videos is allowed with this sample app.