PSNR Evaluation of Media Traffic over TFRC
Mohammad Adly Talaat, Magdi A. Koutb, Hoda S. Sorour · 2009
Abstract—Due to the remarkable increase in media traffic over the existing best-effort IP Internet, the Internet congestion state is expected to worsen. TCP-friendly rate control protocol TFRC is one of the most promising congestion control techniques developed so far. Those techniques have been thoroughly tested in terms of being TCP-friendly and fair. Yet, their impact on the visual quality of the media traffic traversing Internet is still questionable. This paper investigates, in a simulated environment, the effect of incorporating TFRC on the peak signal-to-noise ratio PSNR of the transmitted video over Internet. A number of arbitrary raw videos are encoded, converted into trace files via a known tool-set, and then pushed into a simulated network environment to run over TFRC protocol with coexisting TCP flows. This scenario was run for a variety of videos having different content types, frame lengths, and motion complexity scale. The output video files of the simulations are then examined in terms of PSNR. TFRC was shown to produce visually meaningful and acceptable output video files. Some variations in the PSNR values were recorded among the simulated videos. TFRC performance on slow motion videos was slightly better than on medium-motion that was better than that on high-motion videos.