Transmitting method, receiving method, transmitting device and receiving device

A server that delivers video data comprising first data units, each first data unit including a sequence of samples and being randomly accessible, the server comprising:

• circuitry;
• and a memory connected to the circuitry, wherein the circuitry is configured to:
• transmit second data units, the second data units being associated with a first data unit, each second data unit including a consecutive subset of the sequence of samples stored in an mdat box and control information in moof format, wherein
• the circuitry starts transmitting one or more second data units while the control information in moof format for at least one other of the second data units remains ungenerated,
• the control information includes time information for deriving, using a presentation time or decoding time of a leading sample in the first data unit, decoding time stamps and presentation time stamps of the samples included in the second data unit, and
• the control information in moof format further includes information indicating a number of samples in the second data unit.