Method for playing back video and audio synchronistically in mobile media broadcast

A technology of mobile multimedia and synchronous playback, which is applied to color TV parts, color TV, pulse modulation TV signal transmission, etc. It can solve the problems of small network bandwidth and unsuitability for mobile broadcasting networks, and achieve bandwidth saving and high transmission efficiency Effect

Inactive Publication Date: 2007-05-09
ZTE CORP
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The above RTP method has a relatively small overhead on network bandwidth, but it is o

Method used

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  • Method for playing back video and audio synchronistically in mobile media broadcast
  • Method for playing back video and audio synchronistically in mobile media broadcast
  • Method for playing back video and audio synchronistically in mobile media broadcast

Examples

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Embodiment Construction

[0027] As shown in Figure 1, the data of a channel is composed of header, video data, audio data and synchronization data. The header information is the public information of a channel, including some control information and media description information. There is a field "Absolute time stamp" is used to indicate the start playing time of the channel data.

[0028] As shown in FIG. 2 , the video data includes a video packet header and multiple video units. The video packet header is common information for recording the video data, and each video unit is divided by a synchronization header.

[0029] According to the relative time difference between the start play time of each video unit and the start play time of the entire channel data, a "relative timestamp" information is set for each video unit in each video packet header to record each video unit The relative time difference of playback. In this way, the actual playback time of each video unit is the sum of the "absolute ...

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Abstract

The method comprises: setting a 'absolute time stamp' field in the channel packet header for use in indicating the initial play time of the channel data; the video and audio data is split into multi audio and video units; according the time difference between the initial play time of each video and audio unit and the initial play time of overall channel data, setting a 'relative time stamp' information in each video and audio unit in order to record the relative time difference of each video and audio unit; the actual play time of each audio and video unit is the sum of the 'absolute time stamp' and the 'relative time stamp' of the video and audio unit. After the terminal receives the data, it calculates the play time of each audio and video unit so as to implement the synchronized play of audio and video data.

Description

technical field [0001] The invention relates to a method for synchronously playing real-time video and audio streams of mobile multimedia broadcasting, and belongs to the technical field of mobile multimedia broadcasting or mobile phone television. Background technique [0002] Mobile multimedia broadcasting is a multimedia playback technology that has emerged in recent years. With a handheld terminal, you can watch TV while moving at high speed. The terminal receives the program list through the wireless protocol, and can select the channel it has the right to watch, so that it can receive the multimedia data of the selected channel, and realize watching TV on the mobile terminal. [0003] The air data transmitted by the mobile multimedia broadcasting system is divided into different channels. The data of each channel includes three types: video, audio and data. It is required that the terminal can guarantee the synchronous playback of video and audio, that is, lip synchro...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N9/802H04N7/173H04N7/52
CPCH04N21/41407H04N21/64315H04N21/4307H04N21/2368H04N21/4341H04N21/43072
Inventor 沈灿张建强
Owner ZTE CORP
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