An edge server is served by a rendering machine supplying groups of pictures (GOPs) and comprises a buffer for a predetermined lead time over actual time. If a rendering machine fails then the partially available GOP from that rendering machine is discarded and another rendering machine, having the capacity to handle the GOPs stream, is activated. It provides GOPS from the failed GOP onwards and rendering continues therefrom by the replacing rendering machine. Rendering initially at a faster than real-time speed it is possible to catch-up on time so that the edge server continues to receive and transmit the GOPs without interruption. A plurality of rendering machines continuously operate to feed the edge server(s) and the number of channels used is such that allows for sufficient redundancy as well as for the faster than real-time rendering that is necessary in the case of a need for failover.