One aspect provides a client apparatus and method of adapting the bit-rates of a plurality of media streams transmitted by a client entity in a multi-media conference. The media streams have associated quality levels, at least one of the media streams having a plurality of associated quality levels. A priority value is assigned, on a scale of priority values, to each quality level of each media stream. A list is determined, in order of priority value, comprising all of the assigned priority values and for each assigned priority value specifying the quality levels of the media streams to which the priority value has been assigned. Feedback is obtained for each media stream indicating a QoS for the media stream. Based on the feedback, the bit-rate of one or more of the media streams is adjusted in accordance with the priorities on the list. Another aspect provides a mixer apparatus and method of adapting media streams distributed by a mixer in a multi-media conference.