Broadband networks have many applications' instead of requiring real-time and high quality video communications between media offices, field offices, banks, brokers, hospitals, teaching facilities, research facilities, health maintenance organizations, and physicians’ offices. This study addresses the problems involved in streaming video over a high-speed channels. Novel approaches to quality control, feedback control, error concealment and prevention, and two-layer coding transmission scheme are discussed herein.
     This study presents several novel approaches to satisfying video quality with a feedback mechanism, when cell losses occur during network congestion.
      1). Short-term quality control case (the cell losses occur during of Group of Pictures): First, an efficient temporal error propagation prevention method is presented, a method that involves a hybrid error concealment and error propagation prevention (ECP) technique. Simulation of MPEG-2 coding over ATM networks shows that error concealment with feedback can effectively isolate the error and reduce damage, producing a satisfactory performance even when the cell loss rate exceeds 1%. Again, the ECP technique of non-layer video coding is extended to two-layer video coding. The layered video coding can be matched with a priority transmission to create a high performance video compression and delivery system. This work presents an efficient error resilient system against video loss combining the ECP technique with a dual-priority transmission scheme (DPTS). Therefore, the ECP technique can still be employed to reduce the error damage and limit the impact of cell loss on the erroneous slices.
     2). Long-term quality control case (the cell losses occur during of a video sequence): Although ATM can deliver VBR traffic, the burst traffic may still be dropped due to network congestion. However, the quality of the reproduced video may be sacrificed owing to insufficient peak rate available. This investigation presents an end-to-end quality adaptation mechanism for MPEG traffic on ATM. The adaptive quality control scheme (AQC) includes a connection-level adjustment unit and a quality-monitoring unit. The connection-level adjustment unit at the encoder end adjusts the connection-level based on the message of the network condition from the quality-monitoring unit at the decoder. Simulation results show that the AQC system can effectively utilize the channel bandwidth and maintain satisfactory video quality in various network conditions.
     In sum, this study demonstrates how to achieve satisfactory video quality with short-term error case and long-term error case control, an achievement which is crucial to quality control in broadband networks.