Method for enabling synchronization of data units processed in a first and second receiver comprising the steps of: said first receiver processing data units of a first broadcast stream from a source, a play-out delay Δt p defining a time interval between transmission of a data unit of said first broadcast stream to said first receiver and the processing of said data unit by said first receiver, said first broadcast stream having a first content timeline; thereafter initiating transmission of data units of a second broadcast stream from said source to said second receiver, said second receiver thereby processing said data units of said second broadcast stream, and said second broadcast stream having a second content timeline; a common timeline correlating one or more data units of said first broadcast stream with one or more corresponding data units of said second broadcast stream so that there is a temporal relation between the processing of said one or more data units of said first broadcast stream and the processing of said one or more corresponding data units of said second broadcast stream thereby defining one or more corresponding data units in said first and second broadcast stream as data units corresponding to a same position on the common timeline; storing or providing in a server a plurality of data units corresponding to said data units of said second broadcast stream; selecting, upon said second receiver joining said second broadcast stream in synchronization with said first receiver, for transmission to said second receiver, said transmission being separate from said second broadcast stream, one or more of said data units from said plurality of stored or provided data units corresponding to data units of said second broadcast stream, wherein at least part of the one or more selected data units are said corresponding data units of said first broadcast stream and that have been transmitted to said first receiver but that have not yet been processed by said first receiver due to said play-out delay; transmitting at least one of said one or more selected data units to said second receiver before said corresponding data units of said first broadcast stream have been processed by said first receiver; and processing said of said one or more selected data units in said second receiver at a speed that is higher than the processing speed in the first receiver until the first content timeline coincides with the second content timeline by the coinciding of at least one of said corresponding data units on the first and second timeline. said first receiver processing data units of a first broadcast stream from a source, a play-out delay Δt p defining a time interval between transmission of a data unit of said first broadcast stream to said first receiver and the processing of said data unit by said first receiver, said first broadcast stream having a first content timeline; thereafter initiating transmission of data units of a second broadcast stream from said source to said second receiver, said second receiver thereby processing said data units of said second broadcast stream, and said second broadcast stream having a second content timeline; a common timeline correlating one or more data units of said first broadcast stream with one or more corresponding data units of said second broadcast stream so that there is a temporal relation between the processing of said one or more data units of said first broadcast stream and the processing of said one or more corresponding data units of said second broadcast stream thereby defining one or more corresponding data units in said first and second broadcast stream as data units corresponding to a same position on the common timeline; storing or providing in a server a plurality of data units corresponding to said data units of said second broadcast stream; selecting, upon said second receiver joining said second broadcast stream in synchronization with said first receiver, for transmission to said second receiver, said transmission being separate from said second broadcast stream, one or more of said data units from said plurality of stored or provided data units corresponding to data units of said second broadcast stream, wherein at least part of the one or more selected data units are said corresponding data units of said first broadcast stream and that have been transmitted to said first receiver but that have not yet been processed by said first receiver due to said play-out delay; transmitting at least one of said one or more selected data units to said second receiver before said corresponding data units of said first broadcast stream have been processed by said first receiver; and processing said of said one or more selected data units in said second receiver at a speed that is higher than the processing speed in the first receiver until the first content timeline coincides with the second content timeline by the coinciding of at least one of said corresponding data units on the first and second timeline.