Install gstreamer1.0-rtsp by entering the following commands in the terminal:
sudo apt update sudo apt install gstreamer1.0-rtsp
Description:
RTSP plugin for GStreamer
GStreamer is a streaming media framework, based on graphs of filters which operate on media data. Applications using this library can do anything from real-time sound processing to playing videos, and just about anything else media-related. Its plugin-based architecture means that new data types or processing capabilities can be added simply by installing new plug-ins. . This package contains the GStreamer plugin for RTSP.
Homepage: http://gstreamer.freedesktop.org
Version: 1.14.0-1
Section: universe/libs