A method and system for synchronizing Internet stream media format video and audio

Abstract

The utility model discloses an audio and video synchronization method and system in the Internet stream media format. The method comprises: setting time period and respectively calculating the relevant new reference time of each audio and video frame received by a media terminal during the set time period; writing the new reference time into the decoder. The media terminal respectively deducts the relevant reference time from the corresponding time stamps of later received audio and video frames and sends the audio and video frames to the decoder for decoding after calculation of the relativeplaying time of each frame. The system comprises: a computation module for calculating the new reference time and relative playing time, and a writing module for writing the new reference time into the decoder. The system in the utility model realizes the audio and video synchronization of the ISMA stream during network television live transmission; avoids modifications in audio and video sourcesand possible interactive process between the receiving and source terminals, hence simple structure and easy operation.

Description

technical field [0001] The invention relates to the field of broadband streaming media, in particular to a method and system for synchronizing audio and video in an Internet streaming media format. Background technique [0002] With the rapid development of the Internet and broadband access networks, the live video service on the broadband Internet has developed rapidly. At present, the transmission of live TV services on the Internet generally adopts the Internet Streaming Media Alliance (ISMA) transmission format. This format separates the transmission of audio streams and video streams, bringing the convenience of multi-audio tracks and multi-subtitle support. . [0003] At present, the TV service receiver generally uses the time stamp of the first received audio frame and the time stamp of the first video frame as the reference time, and subtracts the corresponding reference time from the time stamps of the subsequent audio frames and video frames respectively. It can ...

AI Technical Summary

Problems solved by technology

However, during live TV, the access time of each user is different, and the instantaneous network conditions are also different. At the same time, the "best effort" feature of the IP network often results in the first audio frame and The pace of the video frame is not synchronized, so that the audio and video are often out of sync in the ISMA stream

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