A receiver receives a first data stream and a second data stream from a transmitting device over a packet-based communication network, the first data stream being of a first media type (e.g. audio) and the second data stream being of a second media type (e.g. video). The first jitter buffer will buffer each of a plurality of portions of the first data stream as they are received via the receiver, and apply a de-jittering delay before outputting each portion of the first data stream (e.g. audio stream) to be played out through the receiving device. The jitter buffer controller receives information on the second data stream (e.g. video stream), and adapts the de-jittering delay of the first jitter buffer (e.g. audio jitter buffer) in dependence on the information on the second data stream (e.g. information on the video stream).