KR20010112896A - Data transmission method in video conferencing using multi buffering system - Google Patents

Abstract

The present invention is a conferencing and chat system through video and audio transmission over the Internet, and by using the Peer to Peer method between the clients (CLIENT) without breaking through the server streaming techniques commonly applied in the past It is a method to dramatically reduce the load on the server and to enable stable transmission and reception of video and audio data by designing a double buffer.

In the video and audio transmission method, first, the captured image from the client is compressed and transmitted to the other client through the frame control, and in the case of audio, the compressed codec is transmitted and then the image and audio are received. Data is stored using a first-stage temporary buffer, and two-stage buffering is used to compensate for differences in time or data flow rate to receive stable video and audio.

Description

Video conferencing method for transmitting video and audio data using multi-stage buffering {DATA TRANSMISSION METHOD IN VIDEO CONFERENCING USING MULTI BUFFERING SYSTEM}

The present invention relates to a videoconferencing system construction method. More particularly, when real-time videoconferencing or chatting is realized through the Internet, it is possible to greatly improve the problems in applying a client access method through a conventional server. By adopting Peer to Peer method, which is a direct connection method between clients, and adding two or more buffering functions to prevent data loss during video and audio transmission, it is possible to minimize the load on the server and to transmit data stably. It is an operation method.

In the conventional Internet video conferencing method, in most cases, a video server and a voice server are separately provided, and the sender data is first stored in the server and then transmitted to the receiving client through streaming. The server must be configured separately, and the load and load of the server were inevitable.

In the conventional method, the server is a directory server type design, which requires continuous server expansion through separate operation between servers, and there is a problem that a server-specific control program needs to be installed for further expansion. Accordingly, there is a limit that the quality of image and audio data can be dependently dependent.

Therefore, when the increase in the number of users or the state of the leased line in the server and processing a large amount of data, the performance of the server is instantaneously degraded, there has been a problem that can not guarantee a stable service.

In addition, the buffering method used in the existing server-type internet video conferencing system uses only one-stage buffer included in most of the decompression and playback tools that are publicly available. If the inflow is intermittent, the buffering cannot be made stable, which may cause a disconnection in the receiving client.If the buffer is set too long to prevent such a phenomenon, the delay time of the data is long and the meaning of the real time meeting is lost. May result.

The remarkable improvement of the video conferencing system through the one-step buffering of the conventional server relay streaming method is the video conferencing method using the multi-stage buffering, which is different from the server relay method. By adopting Peer method and dividing buffering into multiple stages, data can be transmitted and received, enabling more stable service.

The present invention has been made to solve the above problems of the prior art, the object of the present invention is to adopt a Peer to Peer method when transmitting video and audio to minimize the load on the server, using a buffer of two or more stages Thus, while the channel stores data in the first stage buffer, the data stored in the second stage buffer can compensate for the difference in time or data flow rate, enabling stable transmission and reception, and have less latency than the single buffer over the same effect. To get caught.

In general, Internet video conferencing system uses a streaming technique as a transmission method, which appears and disappears as data flows and is usually cut into small pieces of data in a single step of buffering, and then played when a certain amount of data is collected. If the inflow of data is intermittent due to the influence of a network or a dedicated line as a way of giving, the receiving client may also have a disconnection or delay of video and audio. In order to solve this problem, this system compresses the image and audio data captured by the transmitting client and transmits the image to the other client through the frame control in case of the image, and transmits the image using the compression codec in the case of the voice. In the process of receiving video and audio, the data is stored using the first-stage temporary buffer and the data is received through two or more levels of buffering so that the receiving client can receive stable data even if the data transmission is unstable. That's the way.

1 is a configuration diagram schematically illustrating a method of operating a server type video conferencing system generally used in a conventional video chat.

When users connect to the Internet, they first access the web server, go through the authentication process and the waiting room server, and then interact with the conferences via video and voice servers. Will take.

2 is a system of a Peer to Peer method, the server performs only functions for client authentication, connection and chat, and the configuration of the server load is minimized because video and audio do not go through the server.

3 is a schematic diagram of a video and audio transmission and reception method for a PtoP client-to-client video conferencing system according to a preferred embodiment. First, in case of video transmission, client 1 captures an image and compresses the image in JPG format. After the frame is adjusted according to the network situation, the image is transmitted to the client 2 using the UDP protocol. Client 2 releases the transmitted compressed image and plays the image data through buffering in steps 1 and 2. In the case of voice, a flowchart similar to an image is a flowchart illustrating a process of transferring data to client 2 through a process of capturing, compressing, transmitting, releasing, buffering, and playing a sound source.

In order to achieve the above object, the present invention, in realizing Internet video conferencing, uses a buffer to solve the speed difference between the transmission and reception of video and audio data or the time difference of data transmission. In order to prevent lag time or data dropping that may occur during use, the step of temporarily storing data in the middle is set to two or more steps, so that a more stable system can be constructed.

When using the video conferencing system through the Internet, the client connects to the Internet and sends video and audio data input through the camera and microphone through his IP. Unlike the existing server method, the client is connected to the conference room server. Data will be sent directly to all the other users at the same time.

In the case of image transmission, the user of the transmission side captures the image and compresses it in JPG format, adjusts the frame according to the network conditions, and then transmits the image to other users using the UDP protocol. The receiving user releases the transmitted compressed image and reproduces the image data through two or more steps of buffering. In the case of audio, data is transmitted and received between users through a process similar to an image through capture, compression, transmission, release, buffering, and sound reproduction.

Captured image data is divided into several frames and compressed to transmit more than 15 frames per second in order to achieve a smoother image.In the case of voice, it is possible to eliminate interruptions and lags during video conferencing without going through a server. The data is directly transmitted to the counterpart user, but using two or more buffering techniques ensures maximum stability.

According to the present invention of the above configuration, when real-time video conferencing or chat via the Internet, the Peer to Peer method which is a direct connection method between users by greatly improving the problem in applying the client connection method through a conventional server In addition, by adding two or more buffering functions to prevent data loss during video and audio transmission, stable video conferencing is possible while minimizing data loss or delay of transmission time due to load on the server. It is an operation method.

In addition, the quality of video and audio data may depend on the network conditions of the server or the speed of the leased line by using two-stage buffering technology. That is, the increase of users in the server or the state of the leased line is unstable and excessive. When processing a large amount of data, the performance of the server can be degraded momentarily to compensate for the problem of not being able to guarantee stable service, and to build a more stable system with minimum delay time.

Claims (1)

How to build a stable conference system through multi-stage buffering in two or more stages in the transmission of compressed video and audio data when implementing video conferencing over the Internet