Method and apparatus for implementing code rate switching

Abstract

The invention relates to a method and apparatus for implementing code rate switching. The method includes the following steps that: when slices are downloaded, a latest group of pictures (GOP) is detected in the code streams of currently downloaded slices; the presentation time stamp (PTS) information of key frames (I frames) is extracted from the detected latest GOP; and slices of a slice source code rate corresponding to a downloading rate are played according to the obtained PTS information. According to the method and apparatus of the invention provided by the embodiments of the present invention, the PTS information is acquired, code rate switching in the slices can be realized, stagnation caused by code rate switching between the slices can be avoided, the real-time performance of the acquisition of videos by a user and the online video viewing experience of the user can be improved.

Description

technical field [0001] This article involves but is not limited to multimedia playback technology, especially a method and device for realizing code rate switching. Background technique [0002] With the rapid development of the mobile Internet, the promotion of application services (OTT, Over The Top) technology provided to users through the Internet and the emergence of various smart terminal devices, people can watch videos online through video terminals such as mobile phones, handheld computers, and set-top boxes. An increasingly common way of leisure and entertainment. The dynamic bit rate adaptive technology (HLS, HTTP Live Streaming) protocol proposed by Apple is currently a relatively mature OTT technical specification. The source can be encoded into multiple bit rates, and various bit rate sources can be cut into several 10-second segments. (S) left and right shards, figure 1 It is a schematic diagram of the slice organization method in related technologies, such ...

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Problems solved by technology

[0003] However, HLS bit rate switching also has disadvantages: HLS bit rate switching is based on slices. When the network bandwidth suddenly deteriorates, it will take a long time to download the currently playing high bit rate slices. This will cause the playback to freeze for a long time, and the user experience is very poor; for example, there are three bit rates of 8 megabits per second (Mb / s), 4Mb / s, and 2Mb / s in the video source, and the user's bandwidth is just 8Mb / s s, because the bandwidth and source code rate are basically balanced, it will automatically switch to the highest code rate of 8Mb / s for playback, and there will be no redundant cached data in the player. When the network deteriorates and drops to 2Mb / s , if you directly switch to the 2Mb / s code rate fragments, you can play smoothly, but when the code rate switching in the related technology needs to download the current code rate fragments first, you can switch to the 2Mb / s code rate fragments. slice, taking a slice of 10S as an example, assuming that when the network goes bad, the download of a slice with a code rate of 8Mb / s is just started, and the time it takes is 8Mb / s×10s÷2Mb / s=40s, that is It takes 40 seconds to switch to the download and playback of 2Mb / s bit rate fragments, and it keeps freezing for about 40S

[0004] In related technologies, bit rate switching causes playback freezes, which affects the real-time performance of the user's video acquisition, resulting in a decline in the user's online video viewing experience

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