关键词: 用户体验质量, 索引机制, 快速切换, 随机访问点, 传输流, H.264协议

Abstract: Optimizing interactive response time is an important measure for improving quality of users’ experience. To reduce end-points process delay, client caching delay and acquisition delay of Random Access Point (RAP), a novel method based on building RAP index table was proposed. Media RAP acquisition and key frame abstraction can be quickly done by searching index table. With the analysis of MPEG-2 system layer and H.264 network abstract layer, two methods of key frame abstraction were given. Whereas there are so many media files stored in media server, program information index built by Hash method was discussed, then program information could be acquired quickly. Based on the index tables of RAP and program information built in pre-processing phrase, trick-play implementation was depicted in detail. Furthermore, the feasibility was verified in the IMS-based IPTV prototype developed by Huawei Technologies Co., Ltd and our laboratory.

Key words: Quality of Experience (QoE), index mechanism, quick switch, random access point, Transport Stream (TS), H.264 protocol