Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093-0407, USA.
IEEE Trans Image Process. 2010 Apr;19(4):1022-35. doi: 10.1109/TIP.2009.2038812. Epub 2009 Dec 18.
We consider the multiplexing problem of transmitting multiple video source streams from a server over a shared channel. We use dual-frame video coding with high-quality Long-Term Reference (LTR) frames and propose multiplexing methods to reduce the sum of mean squared error for all the video streams. This paper makes several improvements to dual-frame video coding. A simple motion activity detection algorithm is used to choose the location of LTR frames as well as the number of bits given to such frames. An adaptive buffer-constrained rate-control algorithm is devised to accommodate the extra bits of the high-quality LTR frames. Multiplexing of video streams is studied under the constraint of a video encoder delay buffer. Using H.264/AVC, the results show considerable improvement over baseline schemes such as H.264 rate control when the video streams are encoded individually and over multiplexing methods proposed previously in the literature. The high-quality LTR frames are offset in time among different video streams. This provides the benefits of dual-frame coding with high-quality LTR frames while still fitting under the constraint of an output delay buffer.
我们考虑了在共享信道上从服务器传输多个视频源流的复用问题。我们使用具有高质量长期参考 (LTR) 帧的双帧视频编码，并提出了复用方法来减少所有视频流的均方误差之和。本文对双帧视频编码进行了几项改进。使用简单的运动活动检测算法来选择 LTR 帧的位置以及分配给此类帧的位数。设计了一种自适应缓冲区约束的速率控制算法，以适应高质量 LTR 帧的额外比特。在视频编码器延迟缓冲区的约束下研究了视频流的复用。使用 H.264/AVC，与单独对视频流进行编码时的 H.264 率控制等基线方案相比，以及与文献中以前提出的复用方法相比，结果显示出相当大的改进。不同视频流之间的高质量 LTR 帧在时间上偏移。这在仍然符合输出延迟缓冲区约束的情况下提供了具有高质量 LTR 帧的双帧编码的好处。
