Hi, I made a PKGBUILD for VideoLAN's multicat utility. It is a content-agnostic (optimized for MPEG TS) uni/multicast streaming software suite. It is often considered a multicast version of the netcat utility. It is very lightweight: a compiled package weighs 41K It is available on the AUR under the name `multicat`.
From their website: Simple and efficient multicast and transport stream manipulation The multicat package contains a set of tools designed to easily and efficiently manipulate multicast streams in general, and MPEG-2 Transport Streams (ISO/IEC 13818-1) in particular. The multicat suite of applications is very lightweight and designed to operate in tight environments. Memory and CPU usages are kept to a minimum, and they feature only one thread of execution.