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Frame synchronization method for multiple channels of real-time videos

A real-time video and frame synchronization technology, applied in the video field to achieve the effect of improving accuracy

Active Publication Date: 2014-04-02
BEIHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the above methods, the present invention proposes a multi-channel video synchronization method in which the server and the client cooperate with each other, which can effectively solve problems caused by network delay between the server and the client, different internal times of each camera, and differences between the camera and the server. Synchronization problems caused by factors such as transmission delay between devices, and related parameters can be configured to meet the requirements of different synchronization accuracy, without modifying the image information to achieve the purpose of accurate synchronization of multiple channels of video

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  • Frame synchronization method for multiple channels of real-time videos
  • Frame synchronization method for multiple channels of real-time videos
  • Frame synchronization method for multiple channels of real-time videos

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and take the video stream of H.264 code as example the present invention is described in further detail, before introducing the specific implementation method of the present invention, at first some basic concepts are explained:

[0014] (1) Camera time: the time of the internal system of the camera, the internal time of each camera may be inconsistent;

[0015] (2) server time: the time of the streaming media server, which is used as the standard for frame synchronization;

[0016] (3) Baseline frame rate: configured before the server runs; this frame rate should be greater than the frame rate of any camera; the larger the frame rate, the higher the synchronization accuracy; this frame rate is used to segment the time axis, each interval corresponding to a number;

[0017] (4) Frame synchronization serial number: the serial number generated for each frame according to the server time, which is the serial number of the int...

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Abstract

The invention relates to a frame synchronization method for multiple channels of real-time videos. The method comprises contents of a server and a client. Synchronization information is added into an original video streaming at the server and the process comprises the following steps: (1) extracting video frames from the input video streaming; (2) calibrating arrival time of a frame from each camera by using streaming media server time as the standard; (3) according to the time calibrated in the step (2), calculating a frame synchronization sequence number and using the frame synchronization sequence number as synchronization information of the frames; (4) adding the synchronization information into the video frames. Synchronization processing at the client mainly comprises the following steps: (1) receiving and decoding each channel of video data from the server and extracting the synchronization information; (2) placing the decoded frames into corresponding queues of each channel of video to buffer; (3) checking the queue of each channel of video at a certain time interval by a timer and carrying out playing according to the synchronization information. The method can effectively carry out frame synchronization processing on multiple channels of videos, so that a receiving end can carry out synchronous playing according to the synchronization information.

Description

technical field [0001] The present invention relates to the field of video technology, and more specifically, relates to a method for frame synchronization of network streaming media. Background technique [0002] In network multi-channel video applications, it is often encountered that some videos lag behind other videos due to network delay and other reasons during playback, and multi-channel video playback is not synchronized. In some dedicated video applications, there are high requirements for precise synchronization of multi-channel video playback, such as panoramic video applications and cross-camera tracking applications. In panoramic video applications, it is often necessary to display multiple videos at the same time. These videos may belong to different cameras of the same panoramic camera, or may belong to different cameras. Video transmission over the network will cause delays due to different network environments. At the same time, the internal clocks of each ...

Claims

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Application Information

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IPC IPC(8): H04N5/04H04N21/433H04L29/06
Inventor 周忠张晋诗周颐刘培富
Owner BEIHANG UNIV
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