Audio and video synchronization method and system for decoding moving picture experts group-2 (MPEG-2) transport streams
An MPEG-2, audio and video synchronization technology, applied in the direction of pulse modulation TV signal transmission, TV, electrical components, etc., can solve the problems of inability to accurately determine the PCR value, audio and video synchronization, data loss, etc., to achieve flexible software modification, Save hardware costs and have significant economic benefits
Inactive Publication Date: 2012-09-19
TVMINING BEIJING MEDIA TECH
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However, in software decoding to realize the reception of TS stream, since the software cannot simulate the hardware oscillator, the PCR value cannot be accurately determined, so in software decoding, the PCR value and PTS (DTS) cannot be used to compare the audio and video synchronization, so in the software In decoding, only the PTS (DTS) of audio and video can be compared, but if there is no PCR, then only the PTS (DTS) of audio and video can be compared to synchronize
If there is audio or video data damage, but PTS (DTS) is synchronous, when the data is handed over to the decoder, the data will be lost because it cannot be decoded, and as time accumulates, there will be audio loss, If the video is not lost, the audio and video will be out of sync after passing through the decoding module
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[0038] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0039] The main idea of the technical solution of the present invention is to solve the shortcomings of existing software decoding audio and video synchronization. If the received audio and video data can be counted according to the PTS (DTS) in the original audio and video stream within a configurable period of time, and then exchange Decode the decoder, and after decoding, count whether the audio and video data is matched with the data before decoding. If not, increase or decrease the decoded audio and video data to achieve the synchronization of the audio and video data.
[0040] figure 1 It is a structural schematic diagram of an MPEG-2 transport stream decoding audio and video synchronization system in a specific embodiment of the present invention. Such as figure 1 As shown, the MPEG-2 tra...
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The invention discloses an audio and video synchronization method and an audio and video synchronization system for decoding moving picture experts group-2 (MPEG-2) transport streams. The method comprises the following steps of: separating audio and video from the MPEG-2 transport streams through a transport stream separator; counting and storing an audio frame number of the audio in a preset time and an video frame number of the video in the preset time; decoding the separated audio and video in the preset time; counting and storing an audio frame number and a video frame number acquired after being decoded in the preset time; and respectively comparing the audio frame number and the video frame number acquired before being decoded in the preset time with the audio frame number and the video frame number acquired after being decoded in the preset time, discarding or complementing video frames, and synchronizing the audio with the video. By the technical scheme provided by the invention, hardware cost can be saved, and the method and the system have remarkable economic benefits particularly in the application process of acquiring a large number of audio and video streams.
Description
technical field [0001] The invention relates to the technical field of digital television, in particular to an MPEG-2 transport stream decoding audio and video synchronization method and system. Background technique [0002] MPEG-2 is an international standard for moving image compression, and its transport stream (Transport Stream, TS) has become a system layer coding standard commonly used in the field of digital television. Transport stream is aimed at the transmission of channels with certain bit errors. It can combine multiple programs into one stream for transmission. It allows the same program to contain multiple audio and video streams, and can also add some additional information. Transport streams have a fixed packet length of 188 bytes. Its structure is extremely complicated. For a user, for a specific flow, it is first necessary to know which PID (Packet ID) packets it consists of. MPEG-2 defines some information tables used to describe the content carried by t...
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Login to View More IPC IPC(8): H04N7/52H04N7/26H04N21/242H04N21/434
Inventor 于江吴鹏
Owner TVMINING BEIJING MEDIA TECH