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Video flow processing technique of adding time coding

A technology of time code and video stream, which is applied in the field of video codec, can solve the problems of audio and video out of synchronization, and achieve the effect of ensuring no pause, easy cutting, and audio and video synchronization

Inactive Publication Date: 2005-06-08
梁肇新
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of out-of-sync audio and video in the prior art, the present invention provides the technology of adding time code in the video stream

Method used

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  • Video flow processing technique of adding time coding
  • Video flow processing technique of adding time coding
  • Video flow processing technique of adding time coding

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Embodiment Construction

[0019] Figure 1 illustrates the solution of how the present invention adds timecode to a video stream. The time code corresponds to the frame number, not to the I, P, and B attributes. The storage of the time code is related to the frame number, and has nothing to do with I, P, and B.

[0020] Fig. 2 takes the 24-bit expression method as an example to illustrate the process of accurately calculating the time code of each frame in the video stream within the set expression range of time code digits in the present invention. The time code can be represented by 16-32 digits. Here, the 24-bit expression is used as an example to illustrate the process of accurately calculating the time code of each frame in the video stream. In order to facilitate the retrieval and align the bytes, each frame specifies a 24-bit absolute time code. Absolute timecode is, in a sense, keyframe-like to I-frames. Between them (such as 30 frames per second), the time of each frame is accumulated based o...

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Abstract

The invention relates to a video stream processing technique of adding time code, adding the time code to the video stream, thus able to accurately calculate the time code of each frame as playing the video back, corresponding the obtained time code to time point in the audio one to one, thus realizing the accurate synchronization of audio-video play-back and system stream synthesis, and realizing rapid search, cut and edit for the audio-visual. It solves the following problems of existing techniques in realizing audio-visual synchronization: 1) the workload and complexity of system layer is raised by a large margin; 2) the video uses frame rate as a standard and thus after a longer time, the condition of audio-visual streams not synchronizing will occur; 3) the outstanding synchronizing problem occurring as neither the bandwidth nor the frame rate can be constant because of extreme calculation of synchronizing point of the video.

Description

1. Technical field [0001] The technology belongs to the technical field of video coding and decoding, and relates to a processing technology for adding time codes to video streams. 2. Technical Background [0002] In the current common stream processing methods such as MPEG, the video stream has a constant frame rate, and its actual frame rate is 30 frames per second, that is, a cycle of 33.33... milliseconds per frame. According to the previous traditional working method, there is no need to consider in the video The problem of time, the problem of time is all taken care of by the system layer, so the workload and complexity of system layer synthesis will be very large, and this problem has already been encountered in the system synthesis of MEPG2. [0003] Audio is the standard of time. When synchronizing audio and video, the audio is the standard, and the video is the frame rate. Even if the frame rate is calculated with an accurate floating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N7/52
Inventor 梁肇新
Owner 梁肇新
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