A method of synchronizing audio and video for multicast control in the recording and broadcasting and pad broadcasting states of pis

Abstract

The invention discloses a method for realizing PIS multicast control audio and video synchronization in the state of recording and broadcasting and pad broadcasting, which includes the following steps: A. The PIS central subsystem analyzes the issued broadcast table and determines all the broadcasting groups issued this time ; B. By scoring the equipment status, the central subsystem ranks the equipment in each group, selects the equipment with a relatively low equipment usage rate as the main broadcast controller in the group, and sets the broadcast address of each group at the same time, according to The group owner and group members issue control commands; C. After the group owner broadcast controller receives the control command, it downloads the file according to the address of the command file. After the download is completed, it joins the multicast group according to the multicast address specified by the command, and starts the intra-group multicast D, the group member broadcast controller receives the control instruction, joins the multicast in the group according to the command multicast address; The playback controller plays the consistency of audio and video, which significantly improves the playback effect.

Description

technical field [0001] The invention relates to the technical field of audio and video playback, in particular to a method for realizing multicast control audio and video synchronization in the state of PIS recording and broadcasting and pad broadcasting. Background technique [0002] In the urban rail transit industry, the passenger information display system (PIS) is a necessary part of information construction, and it generally consists of a central subsystem, a station subsystem, an on-board subsystem, and a network subsystem. The central subsystem pushes train information, video information, train load information, weather information, etc. to the playback controller of the station through network technology, and the playback controller interprets and synthesizes the received content according to the definition of the current playlist and displays it on the display screen. The corresponding content is displayed on the screen, and generally different information is displ...

AI Technical Summary

Problems solved by technology

[0010] Long download time: In the direct download mode, in order to reduce the system performance pressure, the group mode is generally adopted, and the central subsystem maintains a reasonable number of playback controllers to participate in the download at the same time through scheduling, prolonging the overall download time

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