Sommario: Video streaming applications that provide interactive features to the end-user are becoming more popular also in the Internet environment. Needless to say, interactive operations play a fundamental role in these applications and studies showed that these operations are well supported if the end-to-end delay, experienced by the application traffic, is kept lower than a pre-defined, and application dependent, threshold. Unfortunately, the best effort nature of the Internet may compromise the QoS achieved by these applications, as the presence of the network jitter may cause the overall end-to-end delay to go above the threshold. Several mechanisms have been proposed in literature to ameliorate the network jitter and they usually have the drawback of increasing the overall end-to-end delay. In this paper we suggest another approach to support interactive video streaming applications: our mechanism acts on the video QoS in order to keep the end-to-end delay within the acceptable threshold. Our mechanism has been evaluated through several simulations and results obtained show that it is well suited for supporting interactive video streaming applications over the Internet, as it ameliorates the jitter without increasing the end-to-end delay, but only slightly affecting the video QoS.