Process for transmitting an ongoing video stream from a publisher to a receiver through a MCU unit during a live session

Process for transmitting an ongoing video stream from a publisher (1) to a receiver (2) through a Multipoint Control Unit (MCU) (3) during a live session to which said receiver is connected through a network, said video stream being encoded in key frames and other types of frames, wherein a key frame is useful for decoding other types of frames, said process providing for collecting and decoding the encoded frames of said video stream at the side of the Multipoint Control Unit (3), and for writing and storing raw decoded frames of said video stream into a database (7) within said Multipoint Control Unit, said process further providing, as a receiver (2) connects to the session, for analysing the type of the latest decoded frame at the time of said connection, so as to send to said receiver said latest frame as sent by said publisher when said latest frame is a key frame and to send to said receiver the raw frame of said latest frame when said latest frame is not a key frame.