Method and apparatus for obtaining media data

Abstract

The present invention relates to the field of the media transmission, and discloses a method and an apparatus for obtaining media data. The method comprises: obtaining a media presentation descriptionfile, wherein the media presentation description file comprises index segment information; according to the index segment information, obtaining an index segment; parsing the index segment to obtainreference frame information corresponding to a data segment; parsing the index segment to obtain data segment information; according to the reference frame information corresponding to the data segment, obtaining a reference frame; and according to the data segment information, obtaining the data segment. For the characteristics of the code stream encoded by using the knowledge base technology, the present invention provides the method based on the DASH technology. Under the framework of the DASH standard protocol, the method supports the application of the knowledge base encoding technology with relatively small grammar modification, so that the client can perform flexible code stream switching and playing without wasting the bandwidth.

Description

technical field [0001] The invention relates to the field of media transmission, in particular to a method and device for acquiring media data. Background technique [0002] Streaming media refers to a technology and process of compressing and encapsulating a series of media data, sending the data in segments through the network, and transmitting media data on the network. [0003] In November 2011, the Moving Picture Experts Group (MPEG) organization approved the HTTP Dynamic Adaptive Streaming over HTTP (DASH) standard, which is a technical specification for transmitting media streams based on the HTTP protocol; The DASH technical specification mainly consists of two parts: Media Presentation Description (MPD) and media file format (file format). [0004] DASH media file format [0005] In DASH, the server will prepare multiple versions of the code stream for the same program content. Each version of the code stream is called media representation in the DASH standard. Th...

AI Technical Summary

Problems solved by technology

[0013] Using the knowledge base encoding method for video encoding will generate a knowledge base code stream and a non-knowledge base code stream. References to the same knowledge base frame, such as Figure 7 As shown, scene 1 and scene 3 refer to knowledge base frame 1 when encoding; when using DASH scheme to segment the non-knowledge base code stream, if scene 1 and scene 3 belong to two different segment, when the client decodes scene 1 and scene 3, it needs to obtain the frame data of knowledge base frame 1 first, that is to say, there will be multiple segments corresponding to the same knowledge base frame, and the time between knowledge base frame and segment There is no one-to-one correspondence, so there is no way for the knowledge base frame and the segment to obtain the reference relationship through the time correspondence; the existing technology cannot support the transmission of the code stream in which the reference relationship between segments is many-to-one. The DASH technology does not have a system-level solution for knowledge base frames; there is no existing system-level technology that can be applied to reference encoding methods such as knowledge bases. There is no system-level protocol for knowledge bases, which leads to this efficient The encoding method cannot match the existing transmission mechanism, which limits its application

Images