dvb subtitle synchronization method and system

A technology of subtitles and system time, applied in image communication, selective content distribution, electrical components, etc., can solve the problems of different delays, subtitles cannot be synchronized with audio and video display, etc., and achieve the effect of good differentiation and rapid integration of applications

Active Publication Date: 2020-09-01
SICHUAN CHANGHONG NETWORK TECH CO LTD +2
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the problem that subtitles cannot be displayed synchronously with audio and video due to the inconsistency of subtitle PES package delay caused by different chip platforms, and to propose a DVB subtitle synchronization method and system

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  • dvb subtitle synchronization method and system
  • dvb subtitle synchronization method and system
  • dvb subtitle synchronization method and system

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Embodiment

[0076] Such as figure 1 Shown is a logical block diagram of a complete DVB subtitle processing system, wherein the PES extraction module is used to extract effective subtitle PES packets according to the subtitle language set by the user, and the PES extraction module includes a TS (transport stream) demultiplexing module and data The preprocessing module, the TS demultiplexing module is used to determine the filter condition of the subtitle PES packet according to the subtitle language set by the user to start the filtering of the PMT table (program mapping table) to obtain the PID (package identifier) ​​of the corresponding language subtitle PES, according to The PID obtains the corresponding subtitle PES packet from the TS and puts the PSE packet into the data buffer area. Specifically, the TS demultiplexing module starts to receive the subtitle corresponding to the PID after the effective payload unit start flag (payload_unit_start_indicator) of the TS packet header PES pa...

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Abstract

The invention relates to the field of multimedia playing and proposes a DVB subtitle synchronization method for the problem that different chip platform analyzing subtitle PES packets have inconsistent delay, resulting in incapability of audio / video display synchronization of the subtitles. The method comprises the following steps: a subtitle PES packet is subjected to subtitle segment analysis including PCS segment analysis; the PCS segment analysis obtains a page state and determines a working state; if in a data obtaining state, the subtitle PES packet is continued to be subjected to segment analysis to obtain subtitle information to be displayed; if in an operation controlling state, a subtitle preparation completion message is sent; the PCS segment analysis monitors a waiting messagein a polling manner; the waiting message comprises waiting duration; if the waiting message is monitored, the PCS segment analysis is paused, and the time for pausing is the waiting duration; the method for dynamically allocating the waiting duration controls a subtitle sending instruction, or a subtitle blanking instruction or transmission of the waiting message. The DVB subtitle synchronizationmethod and system are suitable for synchronous processing of the DVB subtitle.

Description

technical field [0001] The invention relates to the field of multimedia playing, in particular to the processing of DVB subtitles. Background technique [0002] Subtitles are the most conspicuous and the most direct way to provide information. Subtitles can be divided into hard subtitles and soft subtitles. Before hard subtitles are played on TV programs, the subtitle data is directly burned together with the program data, so that the subtitle data is exactly the same as the TV program. The data are mixed together, this kind of subtitle is inconvenient to modify and does not support multilingual subtitles. Soft subtitle is to multiplex the encoded subtitle data into the transport stream. The user receiving end decodes the subtitle content and finally displays it on the screen. The soft subtitle is highly interactive with the user and can be received by the user. DVB (Digital Video Broadcasting) subtitle As one of soft subtitles, the application in digital set-top boxes can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/43H04N21/488
CPCH04N21/4302H04N21/4307H04N21/4884
Inventor 蔡晓丽
Owner SICHUAN CHANGHONG NETWORK TECH CO LTD
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