Make /sbin/ldconfig explicite as scriptlet and don't use the advanced syntax, which isn't supported on RHEL.

Enhance contrib system with package-rpm build target and system. RPM packages are build in extras/contrib/src/rpm/RPMS and extras/contrib/src/SRPMS.

On send error ENOTCONN try to reconnect the stream output instance with the network. This worksaround accidental unplugging of a cable while streaming. However it only works with multicast upto the timeout period of the multicast stream. If that expires the switch or os kicks in and all multicast joins expire. Resulting in no stream what so ever. The client then needs to reconnect. O, yes also only works with fixed ipaddresses.