Multi-camera image synchronization method based on IP live streaming

Abstract

The invention discloses a multi-camera image synchronization method based on IP live streaming. The multi-camera image synchronization method specifically comprises the following steps of: deploying apublic NTP server as a reference synchronous clock of encoders and decoders; connecting all encoders on site and all decoders at a central side with the public NTP server to ensure that reference clocks of all equipment are synchronously aligned; when the field encoders encode, writing the current absolute time into SEI information of an encoding layer; and receiving and decoding each IP live broadcast stream by means of the decoders at the central side, extracting absolute time in the SEI information, synchronously outputting SDI baseband signals according to time marks, and entering back-end manufacturing. The multi-camera image synchronization method has the advantages that strict frame synchronization among multiple cameras is achieved, the purpose of remote synchronous manufacturingis achieved, the frame synchronization precision of the broadcast level is achieved, low-cost and diversified remote live broadcast manufacturing services can be achieved, manufacturing modes are enriched, more service scenes are expanded, and a larger value-added effect is achieved.

Description

technical field [0001] The present invention relates to the technical field related to multimedia audio and video processing, in particular to a multi-camera picture synchronization method based on IP live streaming. Background technique [0002] Traditional professional-level live broadcast production has high requirements for multi-camera synchronization. Because it is often produced on-site, it can be transmitted based on SDI baseband technology. After the signal enters the switcher, each camera signal can be strictly controlled to the frame level. It can be said that the SDI-based production technology not only ensures the quality, but also achieves synchronization. However, SDI is often only used locally and cannot be transmitted over long distances. When the signals of multiple cameras need to be transmitted remotely to the center for production, the return technology based on IP deep compressed live stream is often the preferred solution. While improving the quality,...

AI Technical Summary

Problems solved by technology

However, SDI is often only used locally and cannot be transmitted over long distances. When the signals of multiple cameras need to be transmitted remotely to the center for production, the return technology based on IP deep compressed live stream is often the preferred solution. While improving the quality, it not only reduces the deployment requirements, but also saves a lot of costs

[0003] When on-site multi-camera signals are transmitted back through IP deep compression live broadcast technology, especially when they are transmitted across venues, since each camera position is deployed independently, and then undergoes deep compression by the encoder and remote transmission over the IP network, the signals of each camera position There will be different degrees of delay after arriving at the center. The delay time can range from tens of milliseconds to several seconds. If the multi-camera synchronous frame alignment technology is not used, there will be a large picture deviation between the multi-camera signals , making it impossible to coordinate live production

Images