Method and device for supporting time shifting and look back in dynamic hyper text transport protocol (HTTP) streaming transmission scheme

Abstract

The invention discloses a method, device and system for supporting time shifting and look back and live broadcast on-demand seamless switch in a dynamic hyper text transport protocol (HTTP) streaming transmission scheme. The method is characterized by comprising the following steps: sending a live broadcast media presentation description (MPD) request message by using a media server; receiving a response message which is returned back by the media server and contains the MDP at the current period, wherein media presentation information at the other periods is also contained in the MDP; determining that the time at which a media fragment needs to be required currently exceeds the lower limit of a time range corresponding to the MPD, and determining the media presentation information corresponding to the media fragment needing to be required currently according to the media presentation information in the other periods; and according to the media presentation information corresponding to the media fragment needing to be required currently, acquiring the corresponding MPD, and requesting the media fragment needing to be required currently to the media server according to the acquiredcorresponding MPD, so that a client can support the time shifting and look back within a longer time range, and simultaneously, the size of the MPD can be maintained within an acceptable range.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and a device for supporting a time-shifting look-back method in a dynamic HTTP stream transmission scheme. Background technique [0002] There are many ways for users to use terminal equipment to obtain multimedia content and play it, typically through downloading HTTP files or P2P files to local disks for playback, traditional streaming media methods (RTP / RTCP for data transmission and RTSP for playback control) , P2P streaming media online live broadcast / on-demand, HTT progressive download (HTTP Progressive Download) and so on. On the basis of HTTP progressive download, an enhanced streaming media transmission method based on HTTP protocol has been developed, which is called HTTP Streaming (HTTP Streaming) transmission scheme. Because this solution supports dynamic bit rate adaptation, that is, during the playback process, it can dynamically select media fragmen...

AI Technical Summary

Problems solved by technology

However, since content from other sources may need to be inserted into the live broadcast in the future, and the exact end time of the live broadcast may not be known, it is also impossible to provide description information for the media presentation in a long period of time in the future

This brings about a problem: the media presentation description information of the live media presentation in the future time period may not be provided all at once when the client accesses like the on-demand content, but needs to be gradually added to the MPD as time goes by. The media display description information of the time period, so that the client needs to continuously obtain the updated MPD in order to obtain the media display description information of the subsequent time period, and then have the corresponding URL to obtain the media fragment and play it

But the trade-off is that MPD with a longer total length will bring a greater network burden. Since the client needs to update the MPD frequently, although each MPD file is generally small, the accumulation of each update is also very considerable.

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