摘要： MPEG-4视频流在无线信道中传输时，视频数据必须符合一定的结构，以便当信息丢失和比特错误时，能够进行差错控制。将视频净载荷按一定结构进行适当分组的处理称为打包或者分包。该文对分包的理论模型进行了分析，提出了一种兼顾封装效率和图像质量的自适应分包算法，并利用实时传输协议在GPRS无线信道中进行传输，取得了理想的视觉效果。
关键词:
MPEG-4,
分包,
有效误码率,
实时传输协议
Abstract: When the MPEG-4 visual stream is transferred in wireless channel, the visual data must be in accordance with certain structure for better error control when the bit error happens. The grouping of the payload of the visual data according to certain structure is called as packetization. The model of the packetization is analyzed and an algorithm of adaptive packetization based on both encapsulation efficiency and video quality is proposed. Experiments using real-time transport protocol over GPRS (general packet radio services) network are used to validate the analysis of the most efficient scheme.
Key words:
MPEG-4,
packetization,
effective error rate,
real-time transport protocol
中图分类号:
许呙兢;罗志祥;曹明翠. 无线视频传输中MPEG-4自适应分包算法[J]. 计算机工程, 2007, 33(18): 242-244,.
XU Guo-jing; LUO Zhi-xiang; CAO Ming-cui. Adaptive Packetization of MPEG-4 Visual Stream in Wireless Transmission[J]. Computer Engineering, 2007, 33(18): 242-244,.