This paper proposes a new QoS monitoring method of an IP-based video streaming system at the client. To comprehend perceived quality of the client, we focus on detecting the application processes about presentation timeline of individual video frames. In this paper, we define the start-up delay and scene-misalignment time as the indicators of perceived quality at the client. Additionally, we have developed a prototype that is capable of measuring the start-up delays and misalignment times of the video-streams for real-time QoS management. Through the experiment using this prototype, evaluation confirmed that our system is effective for managing QoS levels of video streams delivered over IP networks.
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