Patent ID: 7675943

Claim:
A media source, comprising: a global clock determination unit configured to determine, once within a session, a global wallclock time having a first statistical variation; a sample clock determination unit configured to determine a sample clock time; a communications unit configured to send out, only once within the session, a control packet to one or more receiving media sinks, said control packet including two control packet timestamps, one of the control packet timestamps defining a moment in time in time units of said global wallclock time, another of the control packet timestamps defining the moment in time in time units of said sample clock time; a sending unit configured to send out time-stamped media data packets to the one or more receiving media sinks, each of the time-stamped media data packets including a timestamp that is a time of creation of the time-stamped media data packet; a determining unit configured to determine a play-out time offset based, in part, on the first statistical variation; and a transmission unit configured to send out the play-out time offset to said one or more receiving media sinks once for all time-stamped media data packets of the session.