Conference Paper

Optimal Frame Selection with Adaptive Playout for Delivering Stored Video under Constrained Resources

Nanyang Technol. Univ., Singapore
DOI: 10.1109/ICME.2007.4285021 Conference: Multimedia and Expo, 2007 IEEE International Conference on
Source: IEEE Xplore

ABSTRACT In this paper, we propose a server-client coordinated joint optimal frame selection with adaptive playout for delivering stored video under both limited channel bandwidth and finite client buffer condition. In particular, the client will reduce the frame playout rate whenever its buffer fullness level falls below a given threshold in an attempt to prevent buffer underflow. And when the buffer fullness exceeds the threshold, the client will switch back to the normal frame playout rate. The server is aware of the adaptive playout decision made by the client and incorporates the decision into its optimal frame selection framework for joint optimization. The objective is to minimize the number of frames that must be discarded in order to prevent client buffer underflow or overflow and make full use of the limited bandwidth resource.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Recently smooth adaptive media playout (SAMP) was suggested to deal with the visual quality degradation problem caused by the fluctuation of playout speed in conventional AMP. However, while encountering the burst packet losses, it still had a potential buffer outage risk if buffer level was not safe enough. In this paper, a safety guaranteed SAMP (SG SAMP) algorithm is proposed to deal with the above hazard. Whenever the current buffer level deviates from the predefined safe area, the linear playout adjustment order is triggered to maintain the buffer safety. The simulation results have shown that SG SAMP outperforms SAMP in reducing the buffer outage probability and provides smooth and reliable playback, especially in wireless video streaming. The playout adjustment number and the frame loss number are both about 30% less.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Client-side data buffering is a common technique to deal with media playout interruptions of streaming video caused by network jitters and packet losses of best-effort networks. However, stronger playout interruption protection inevitably amounts to larger data buffering and results in more memory requirements and longer playout delay. Adaptive media playout (AMP), also a client-side technique, can reduce the buffer requirement and avoid buffer outage but at the expense of visual quality degradation because of the fluctuation of playout speed. In this paper, we propose a novel AMP scheme to keep the video playout as smooth as possible while adapting to the channel condition. The triggering of the playout control is based on buffer variation rather than buffer fullness. Experimental results show that our AMP scheme surpasses conventional schemes in unfriendly network conditions. Unlike previous schemes that are tuned for a specific range of packet loss and network instability, the proposed AMP scheme maintains consistent performance across a wide range of network conditions.
    IEEE Transactions on Multimedia 12/2009; · 1.75 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Wireless Multimedia service faces the difficulty of QoS decrease caused by the cache underflow, due to both the unreliable and time-varying nature of the wireless channel. In order to reduce the probability of the cache outage, a statistical model is established to estimate the underflow time of the cache. Based on the estimation of the underflow time, an adaptive playout algorithm with dual-threshold to adjust the frame rate is presented. This approach adjusts the threshold dynamically according to the channel conditions and the status of the cache, and thus regulates the frame rate timely. Moreover, the algorithm possesses scene-aware characteristics, since it adjusts the playout rate according to the motion intensity of the playout scenes to reduce the underflow probability of the cache and provide better QoS. Simulation results show that as compared to other adaptive media playout algorithms, the proposed algorithm efficiently reduces the probability of the cache underflow, especially in low rate channel and timevarying rate environment, and provides better visual quality.
    IEEE Transactions on Consumer Electronics 12/2010; · 1.09 Impact Factor