VLC player shows entire image of ip camera's stream. But in Polywall image is cropped.
In source settings default cutting parameters are set as 800x600.
It is possible to change cutting in rtsp sources only in Preview section using Scenarios tools.
1) Create a new scenario.
2) Put rtsp source in the Preview section.
3) Set needed resolution in source parameters. For example: for Axis m3204 it is 1280x800.
4) Play the scene.
5) Use saved scenario for playing such rtsp sources.