Seize who's assets exactly? The second you draw a line and say anyone on the other side has fewer rights than you, you're falling right in line with those same right-wing policies.
There is no way to define a law against "right-wingers" that doesn't infringe on basic rights like freedom of opinion and freedom from discrimination. You can't punish people for being part of a group. You need to point to something specific that each individual has done that is illegal before prosecuting. Anything less and society will break down into fascism.
A Raspberry PI should be fine for direct play, but it doesn't really have the processing power to transcode. Check to see which mode you're in.
If you want the ability to live transcode, you'd probably have better luck with an old laptop or PC with a dedicated GPU (Even the lowest end ones have the same video encoding hardware in each generation, I use a GTX 1050).