Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

AVS (audio video standard) audio and video presynchronizing method based on RTP (real time protocol) package

An audio and video, pre-synchronization technology, applied in the direction of image communication, selective content distribution, electrical components, etc., can solve the problem of unsatisfactory synchronization effect and achieve the effect of eliminating jitter in the media

Active Publication Date: 2012-09-12
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
View PDF3 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter what is added is the buffer for receiving RTP packets, the decoding buffer, the image display buffer, or the recently proposed double buffer, although the delay jitter can be reduced to a certain extent, most of them are simply changed by changing the buffer. The size of the area is used to eliminate the time delay jitter in the media, and then in the image display buffer, according to whether the audio and video playback time is consistent, the frame is dropped or a frame of image is repeatedly displayed, but the actual synchronization effect is not ideal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • AVS (audio video standard) audio and video presynchronizing method based on RTP (real time protocol) package
  • AVS (audio video standard) audio and video presynchronizing method based on RTP (real time protocol) package
  • AVS (audio video standard) audio and video presynchronizing method based on RTP (real time protocol) package

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] The specific implementation is as follows:

[0045] 1. Receive RTP audio and video packets:

[0046] Start the thread that receives RTP audio and video packets, open the audio buffer, and set its initial value to Am; open the video buffer, set its initial value to Vm, and prepare to receive new RTP audio packets and RTP video packets. figure 1 A1, A2, ---, An is the serial number of the RTP audio package, V1, V2, ---, Vm is the serial number of the RTP video package, and the actual serial numbers represented are not necessarily consecutive. remove figure 1 In addition, the audio listening port, video listening port and missing mark are not drawn in other figures, but they are actually there. They are not drawn for the sake of clear explanation later.

[0047] 2. Analyze packet lateness and handle:

[0048] Start the thread that parses ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an AVS (audio video standard) audio and video presynchronizing method based on RTP (real time protocol) package. The AVS audio and video presynchronizing method mainly comprises the following steps of: receiving an RTP audio and video packet through an audio and video buffer area; judging the retardance of a packet and carrying out corresponding process according to a serial number of the RTP audio and video packet; calculating absolute playback time zone represented by the RTP audio and video packet according to information, such as a time stamp, a data type, a frame number and the like carried by the packet head character section of the RTP audio and video packet; establishing the mapping of the RTP audio and video packet according to the absolute playback time zone; determining an RTP video and audio step-out situation according to a mapping relation of the RTP audio and video packet; and carrying out corresponding regulation on different step-out situations. The method provided by the invention can effectively improve the step-out situations among AVS medias and simultaneously realize fast synchronization of frequency medias to achieve a total audio and video synchronization effect.

Description

technical field [0001] The invention relates to the field of streaming media synchronization, in particular to the field of AVS audio and video media synchronization for RTP package transmission. Background technique [0002] AVS (Audio Video coding Standard, audio and video coding standard) is a digital audio and video coding standard formulated by the digital audio and video coding and decoding technical standard working group. The AVS standard includes 9 parts such as system, video, audio, digital rights management, and mobile video. AVS multimedia communication systems mostly transmit real-time multimedia data on packet-switched networks that do not guarantee QoS (Quality of Service), and their users all hope to have a good quality of service guarantee, but due to the unreliability and Due to factors such as transmission delay, a series of problems such as packet loss, disorder, jitter, and repetition are often encountered in the process of real-time data communication....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04N21/6437H04N21/8547
Inventor 张钦宇吴伟强王磊张常键
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com