A scheduler of computer processes. The scheduler obtains predictions of a computing load of at least one multimedia process comprising real time video encoding or transcoding of a video in real time, including predictions of a target index of video quality to deliver the video over a period of time. Predictions of available computing capacities of a cluster are also retrieved. A determination is made, based on the predictions of the computing load and the predictions of the available computing capacities, of a processing capability to allocate the at least one multimedia process during the period of time. At least one virtual environment is created for the at least one multimedia process. The computing capacity of the at least one virtual environment is adapted to the predictions of the computing load of the at least one multimedia process during the period of time.