In this paper, we propose a novel realistic simulation tool-set known as MyEvalvid-NT for evaluating video delivery over simulated networks. This tool-set integrates Evalvid and NS2. Though PSNR is most often used to measure the perceived quality by an end user, it is time-consuming to calculate PSNR when evaluating a long video sequence. To avoid overhead, in this paper, we used decodable frame rate (Q) as our performance metric to evaluate the received video quality. We use a video transmission over erroneous wireless network to demonstrate the simulation using this tool-set. We also showed that Q can measure perceived video quality adequately as PSNR. With this tool-set, researchers can easily analyze their designed mechanisms, such as network protocols or QoS control schemes in a realistic simulation environment. In brief, researchers who utilize our proposed QoS assessment framework will be benefited in verifying their designs regarding video transmission over simulated network.