I know that is is possible to stream videos with the NSLUs. But its tight and strictly depends on
1) That nothing else is using the NSLU currently. Not much reserves.
2) Thats its rather highly compressed videos. Streaming HDs doesnt work. i tried it.
The synology has an advantage there. No doubt. At the costs that I mentioned. They are just starting to fully hack these newer synologies. A crosscompile toolchain seems to exist but is rather new.