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Quality is an essential factor in multimedia communication, especially in content adaptation/compression. This paper deals with the perceptual quality of audiovisual contents. Existing audiovisual quality models, which are based on intuitive formulas to combine individual audio and video qualities, cannot clearly identify the contributions of different factors in audiovisual quality. In this paper, we present a graph-based formulation of audiovisual quality. A key advantage of our approach is that it can quantify the contributions of modalities as well as the contribution of their relation in audiovisual perceptual quality.