Impossible to play video exports

[Lopasilver]

Hello from France!

I've tried for the fist time to animate an svg file with sozi in order to play it on Digital Dynamic Signage ("écran dynamique" in french), but export files as mp4 do not play on our screens. Even windows and linux softwares do not play it at all but VLC. We suspect chroma subsampling as 4:4:4 to be the culprit for not to be able to stream. The goal is to broadcast video on these screens without the need of another encoding software.
Any advice are welcome
Philippe