Audio/video smooth broadcasting method adaptive to public wireless network

An audio, video, and network technology, applied in the field of smooth audio and video broadcasting to adapt to public wireless networks, can solve the problems of mosaic, coding and transmission, intermittent sound, etc., to ensure integrity and controllable delay , the effect of saving bandwidth

Active Publication Date: 2014-03-26
BEIJING SHINEON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relationship between encoding and transmission is not considered enough. As a result, it cannot adapt to the characteristics of poor transmission stability of public wireless networks. When the network is unstable, the transmitted audio and video images and sounds will have problems such as image cards, mosaics, and intermittent sound.

Method used

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  • Audio/video smooth broadcasting method adaptive to public wireless network
  • Audio/video smooth broadcasting method adaptive to public wireless network
  • Audio/video smooth broadcasting method adaptive to public wireless network

Examples

Experimental program
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Embodiment 1

[0024] This embodiment is a method for realizing smooth broadcasting of audio and video adapted to public wireless networks. The method adjusts the transmission strategy according to real-time parameters of the network status to ensure smooth broadcasting of audio and video in an environment where the network fluctuates in a large range. The transmission strategy includes: when the effective bandwidth of the network is lower than the coding bit rate, automatically lowering the coding bit rate to a value lower than the effective bandwidth of the network. When the effective bandwidth of the network is lower than the minimum value of the encoding bit rate adjustment range, the lowest bit rate encoding is used, and the bidirectional reference frames in the transmission stream are actively discarded to save the amount of transmitted data and ensure audio priority. When the network bandwidth can match the encoding bit rate, try to increase the encoding bit rate to obtain higher pictu...

Embodiment 2

[0039] This embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment regarding encoding parameters. The encoding parameters described in this embodiment are GOP 12 and frame structure IBBP.

[0040] Figure 4 It is a schematic diagram of the GOP structure of the encoding parameters described in this embodiment. It shows a total of 12 frames in a GOP, including 1 I frame, 3 P frames and 8 B frames, and the arrangement structure is I, B, B, P , B, B, P, B, B, P, B, B (the arrow in the figure indicates the prediction direction). The I frame is the Intra-coded picture (intra-coded image frame), which does not refer to other image frames, and only uses the information of this frame for encoding; the P frame is the Predictive-coded picture (predictive coded image frame), which refers to the previous I frame or P frame, which uses motion prediction for inter-frame predictive coding; B frame is Bidirectionally predicted picture (bidirectional...

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Abstract

The invention relates to an audio/video smooth broadcasting method adaptive to the public wireless network. The audio/video smooth broadcasting method includes: setting parameters; forming audio/video transmission streams; abandoning partial information; transmitting the streams through the network; adding partial information; outputting the streams; working out a transmission strategy. The audio/video smooth broadcasting method adjusts the transmission strategy in real time by monitoring the effective bandwidth of the current network timely, and ensures audio/video at the receiving terminal to be broadcasted smoothly. If the encoding rate has been adjusted in the extreme state, namely the lowest encoding rate of an encoder, about one third of the network bandwidth can be saved by abandoning a bidirectional reference frame, and integrity of each audio frame and audio continuity can be ensured. Control on the delay length in the whole transmission process can be ensured by setting delay parameters, and further out of control of audio/video transmission delay caused by network state deterioration can be avoided. Meanwhile, Port Address Translation (PAT) information and PMT information in the audio/video transmission streams at the transmitting terminal are properly abandoned, placeholder data are removed, and the bandwidth is saved.

Description

technical field [0001] The invention relates to a method for realizing smooth broadcasting of audio and video adapted to public wireless networks, which is a method for network data transmission and a method for audio and video data transmission. Background technique [0002] The network for data transmission will always be in an unstable state, especially the public wireless network has defects such as limited bandwidth, unstable state, and susceptible to interference. Especially in the public wireless network, the distance of the base station, the occlusion of buildings, the weather Changes in the use of public wireless networks by the surrounding population will have a great impact on the status of public wireless networks; at the same time, for audio and video transmission, the requirements for video frame integrity, delay, and audio continuity, as well as audio and video transmission streams The fluctuation of its own data volume puts forward higher requirements on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/238H04N21/24H04N19/146
Inventor 骆健刘运红胡凡刘峥赵燕超宫昀
Owner BEIJING SHINEON TECH
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