Enhancing Quality of MPEG Video through Partially Reliable Transport Service in Interactive Application

Abstract

Real-time video communication over a packet switching network is subject to losses and errors. In few networking environment, a partially reliable transport service based on error control by retransmission is a possible option. We propose a retransmission-based correction scheme which is driven by the time remaining for the data delivery and also by the importance of artifacts the data loss produces in the reconstructed video. This scheme is applied to continuous MPEG video packet streams. Experimental results show that the picture quality of MPEG video is degraded more gracefully in the presence of network errors, and those with a low cost on network bandwidth. In addition, the best QoS policy to use the partially reliable transport service is highlighted.

Optimal multitone bit allocation for fixed-rate video transmission over ADSL

“…As shows Table 1, the MPEG bitstream data can be divided in four layers with priority according to the importance of data. 10 Each layer is then assigned a number of tones depending on its size (in bits) and the quality of transmission available (see section 4), under the constraint of real time transmission. Thus, crucial data such as header information can be well protected by being transported by an appropriate number of lower frequency carriers which are more robust.…”