摘要
视频内容一般具有数据量大的特点,随着网上视频内容的增多。用户需要一种基于关键帧的视频内容快速预览播放方法,来更快更准确地找到自己感兴趣的内容。文章提出的方法通过在符合MPEG-4标准的MP4文件中加入预览索引轨道的方式来组织预览数据,然后通过对RTP头中时间戳的修改来流化预览数据,最后通过SDP来描述预览索引轨道,实现了对视频流中一组时间间隔不固定的关键帧的连续索引播放。本方法虽然主要针对MP4文件格式,但由于采用了RTP、SDP等协议而具有一定的通用性。
With the development of networks, videos, which have more data than other media such as text, occur more and more. In order to seek quickly inte-rested content in a video, a new method that plays video in the means of preview based on the key-frames is needed. This paper puts forward a method to meet the need. First it organizes preview-index data in MP4 file format by adding a new preview-index track, then streams previewing key-frames by the means of changing timestamp field in the RTP head, finally describes the preview-indexed track in the form of SDP. By this method a video will be played based on the preview-index using key-frames.Although this method is based on the standard MP4 file format of MPEG-4, it uses RTP and SDP protocols so that it is general for other file format.
出处
《微电子学与计算机》
CSCD
北大核心
2002年第7期44-47,共4页
Microelectronics & Computer
基金
国家863基金资助项目(2001AA110342)
中国科学院青年基金资助项目(20016280-14)
