issues streaming a video split over a wall

[CarlO_321]

Hi,
I am trying to stream a video, splitted over 4 PCs, each driving a tile of the wall, but
a) While locally it works, on the nodes I am not able to get it splitted, but just the full video replicated on very node. Here are my commands:
vlc -vvv VTS_01_1.VOB --vout=Direct3D --vout-filter=wall --wall-cols=2 --wall-rows=2 --wall-active --intf=dummy --filter=deinterlace --deinterlace-mode=linear --sout=udp:10.1.1.1
By the way, for a wall is it preferable/possible multicast or a repeated unicast?
b) the deinterlace-mode is not actived.
Any suggestion is most welcome: thank you very much for the assistance,
Best regards,
Carlo