The application describes a method and system for controlling a processing of video data such that the video data may be transmitted over a connection in a communication network, where the connection employs a plurality of protocol layers. The processing of video data for transmission is performed at a first layer. A value or values of one or more transmission condition parameters indicative of transmission conditions in the network are acquired, where these transmission condition parameters are specific for a second layer provided lower than the first layer. Then one or more values of one or more video control parameters usable at the first layer are derived from the value of the least one transmission condition parameter and the processing of video data is performed in accordance with the derived one or more values.