Run deepstream-app with blur and shadow when using ffmpeg to push rtsp

It should be an issue in network bandwidth/stability. Looks like the received stream is incomplete so it cannot be decoded well. You may try to reduce bitrate and check if it helps.

May also try to set up RTSP server through test-launch. Please refer to
Jetson Nano FAQ
[Q: Is there any example of running RTSP streaming?]