XBMC and low bandwith ... force transcode?

Hi All,
I'm using in my Network XBMC via PowerLine. Screen is not HD (1280 x 1024). The Problem, I've very limited speed ( ~2-4 MBit), so HD Videos from my PC are StopMotion
Serviio is running on a Media PC, fast enougt for transcoing.
Is there a Profile availiable which forces transcoding for XBMC, maybe same as stream from outside an my android in low resolution.
I'm not a specialist and I've no idea what to set in the config file.
Thanks for help!
BR, Andi
I'm using in my Network XBMC via PowerLine. Screen is not HD (1280 x 1024). The Problem, I've very limited speed ( ~2-4 MBit), so HD Videos from my PC are StopMotion

Is there a Profile availiable which forces transcoding for XBMC, maybe same as stream from outside an my android in low resolution.
I'm not a specialist and I've no idea what to set in the config file.
Thanks for help!
BR, Andi