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Method and device for synchronous video playback

A technology of synchronous playback and video recording, applied in image communication, television, closed-circuit television systems, etc., can solve problems such as insufficient network bandwidth, and achieve the effect of solving data packet loss and improving synchronization.

Active Publication Date: 2019-06-11
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of high bit rate of traditional synchronous playback, high requirements on the network environment, and poor synchronization of synchronous playback, the present invention provides a video synchronous playback method and device, which can effectively solve various problems caused by insufficient network bandwidth, and can significantly improve each Camera video playback synchronization

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  • Method and device for synchronous video playback

Examples

Experimental program
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Embodiment 1

[0040] Embodiment 1, such as selecting cameras A, B, C, and D for synchronous playback, the set recording start and end time is 2016-1-1 8:00-10:00, with 2016-1-1 8:00:00 Take video data decoding and synthesis as an example. Assume that the video resolution of camera A is 720P (1280*720 pixels) and the frame rate is 25fps; the video resolution of camera B is 720P (1280*720) and the frame rate is 20fps; the video resolution of camera C is 1080P (1920 *1080), the frame rate is 25fps, the recording resolution of camera D is CIF (352*288), and the frame rate is 5fps. According to the video frame rate corresponding to each camera, the corresponding decoding speed of each camera is obtained. The decoding speeds of cameras A, B, C, and D are 40ms / f, 50ms / f, 40ms / f, and 200ms / f respectively. The maximum frame rate of the video recording frame rate corresponding to each camera is 25fps, and the synthesis speed is 40ms / f.

[0041] The back-end server extracts the video data correspond...

Embodiment 2

[0062] Embodiment 2, such as selecting cameras A, B, C, and D for synchronous playback, the set video recording start and end time is 2016-1-1 8:00-10:00, assuming that the recording resolution and frame rate of each camera are the same , the frame rate is 25fps, assuming that the mosaic image at 2016-1-1 8:30:00 has been completed, that is, the image corresponding to the frame number 25 of each camera at 2016-1-1 8:30:00 is stored in the second cache data. Assume that the image data corresponding to each camera extracted by the backend server from the first cache next time is the image data of camera A and C at 2016-1-1 8:30:01 frame number 1, and that of camera B at 2016-1-1 1 Image data of frame number 1 at 9:00:00, image data of camera D at 2016-1-1 8:35:00 frame number 1. That is, the time information corresponding to the image data corresponding to each camera extracted from the first cache this time is different, so only cameras A and C with the smallest time informati...

Embodiment 3

[0067] Embodiment 3, such as selecting cameras A, B, C, and D for synchronous playback, the set recording start and end time is 2016-1-1 8:00:00-10:00:00, and the search finds cameras A, B, and C Contains the recording data of 2016-1-1 8:00:00-10:00:00, but camera D only contains the recording data of 2016-1-1 8:30:00-10:00:00. Assume that the video frame rate of each camera is 25fps. Initially, first obtain the video data of camera A, B, and C at 2016-1-1 8:00:00 frame number 1, and the video data of camera D at 2016-1-1 8:30:00 frame number 1 and decode them respectively The image data corresponding to each camera is obtained, and put into the first buffer. Based on step 104', since the time information of the image data corresponding to camera D extracted from the first cache is greater than the time information of the image data corresponding to other cameras, only cameras A, B, and C at 8:00 on January 1, 2016 are extracted. :00 The image data of frame number 1 is put i...

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Abstract

The invention provides a synchronous video playback method and apparatus. The method comprises the following steps: receiving synchronous video playback information sent by a client, and obtaining video data of all cameras requiring synchronous playback according to the synchronous video playback information; performing decoding, synthesis and encoding processing on the obtained video data corresponding to the cameras to obtain spliced video data; and sending the spliced video data to the corresponding client to perform synchronous video playback on the all cameras requiring synchronous playback. The synchronous video playback method and apparatus provided by the invention are suitable for various network environments, and greatly improve the synchronism of video playback.

Description

technical field [0001] The invention relates to the field of video monitoring, in particular to a video synchronous playback method and device. Background technique [0002] As an important means of obtaining evidence after the event, the video playback service has always been the main function of the video surveillance system. Synchronous playback means to play back the recordings of multiple cameras at the same time, which is convenient for comparison and viewing. Usually, the total bandwidth of the code stream occupied by synchronous playback is the sum of the video code streams of all cameras for synchronous playback. For example, the video recordings of four cameras A, B, C, and D are synchronously played back, assuming the recording bit rates of the four cameras Both are 2M, so the total bit rate bandwidth occupied by the synchronous playback of the four cameras is 8M. For monitoring environments with poor network conditions or mobile phone monitoring client applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/432H04N21/433H04N5/76H04N7/18
CPCH04N5/76H04N7/181H04N21/4325H04N21/4331
Inventor 付建辉李世明张东斌魏钦敏
Owner ZHEJIANG UNIVIEW TECH CO LTD