KR100886836B1 - Method, server and system for streaming transcoding content stored in cache for video on demand service - Google Patents

Abstract

A VOD service providing method for providing previously cached conversion contents using a caching technique, a contents conversion server therefor and a customized service system are provided to provide the conversion contents in order to be suitable for the terminal in mobile environment. An application server(110) receives a video on demand requirement message. A conversion contents caching validation request message about the contents corresponding to the content information is transmitted. A streaming service connection information is generated. The streaming service access request message is received and a streaming server(120) transmits the conversion contents require-message. The contents convert server(130) receives the conversion contents caching whether to receive the validation request message from the application server. The conversion contents caching acknowledgment message is transmitted to the application server. The conversion contents require-message is received from the streaming server. The conversion contents is searched and transmits a message to the streaming server.

Description

A method for providing on-demand video service that delivers content by providing content conversion function using caching technique, a content conversion server and on-demand service system for it {Method, Server and System for Streaming Transcoding Content Stored in Cache for Video On Demand Service}

The present invention relates to an on-demand video service providing method for transmitting content by providing a content conversion function using a caching technique, a content conversion server and an on-demand service system for the same. More specifically, by providing a content conversion function and a caching technique for the converted content, by providing the pre-cached converted content suitable for the terminal in the mobile environment, enabling users to start seamless content playback and quick content playback An on-demand video service providing method for transmitting content by providing a content conversion function using an effective caching technique for providing an on-demand video service, a content conversion server and an on-demand service system therefor.

Nowadays, Video On Demand (VOD) service is a video service that allows users to receive desired contents such as programs, music and videos through a computer or television connected through a network. The demand for yoga is increasing rapidly. The VOD service has a function of pausing or repeating playback of a part watched while watching.

On the other hand, with the rapid development of mobile communication networks and mobile terminals, there is an increasing demand for receiving VOD services even in a mobile environment, deviating from the existing VOD service provided only by a computer or a television.

However, such a conventional VOD service provision technology does not consider the characteristics and performance of the terminal to play the content. Therefore, when a mobile terminal having a relatively lower processing performance than a general computer plays a suitable high resolution content in a relatively high performance computer, a problem occurs that causes severe disconnection when playing the corresponding high resolution content. In other words, high-resolution content suitable for playback on a computer puts a high load on the mobile terminal, which can seriously cause a break in playback.

Therefore, a similar problem arises even if the above-mentioned problem is solved by applying the content conversion technology researched in the general content transmission technology, not the conventional VOD service providing technology, to the VOD service.

Because it takes a lot of time to perform the content conversion function in the VOD service, where rapid content delivery is vital, it can provide seamless content playback to the terminal in the mobile environment, but it takes time to start playing the content. The execution time of the content conversion function causes a problem that greatly degrades the user's satisfaction with the VOD service.

An object of the present invention for solving this problem is to provide a video service on demand that can be played back to the user by providing content by converting the content to suit the terminal in the mobile environment.

Another object of the present invention for solving this problem, by using a caching technique, by providing a pre-cached converted content suitable for a terminal in a mobile environment, enabling users to start seamless content playback and quick content playback Is to provide on-demand video services.

According to an aspect of the present invention for achieving the above object, in a video on demand service system that provides a video service on demand, the terminal receives the on-demand video service request message containing the terminal information and content information, the content An application server transmitting a converted content caching confirmation request message for content corresponding to the information, and generating streaming service connection information based on the received converted content caching confirmation response message; A streaming server for receiving a streaming service access request message, transmitting a converted content request message, and streaming the converted content request message to the terminal while receiving the converted content for the content; And receiving the converted content caching confirmation request message from the application server, searching for the converted content for the content, and transmitting the converted content caching confirmation response message to the application server, and converting the converted content request message into the streaming. After receiving from the server, the on-demand video service to provide a content conversion function using a caching technique to transfer the content, characterized in that it comprises a content conversion server for retrieving the pre-converted converted content and transmitted to the streaming server; Provide a system.

According to another aspect of the present invention for achieving the above object, in the content conversion server providing a content conversion function to provide on-demand video services to the terminal, the conversion content caching confirmation request message and the conversion content request message Receiving message receiving unit; A converted content list DB for storing the converted content information; A converted content storage unit for caching the converted content; A converted content list search management unit for searching for converted content information previously stored in the converted content list DB; A message transmitter for transmitting a converted content caching confirmation response message including search result information in the converted content list search manager; And a converted content transmission unit for transmitting the cached converted content to the converted content storage unit when the converted content request message is received at the message receiving unit. Provide a content conversion server that provides a conversion function.

According to another aspect of the present invention for achieving the above object, in a method for providing an on-demand video service in the on-demand video service system, (a) receiving an on-demand video service request message containing the content information from the terminal; Receiving a video service request on demand; (b) a content information storage step of storing the content information; (c) checking whether the converted content is cached to determine whether the converted content corresponding to the stored content information is cached; (d) transmitting streaming service access information for transmitting streaming service access information to the terminal if the converted content is cached; And (e) when the streaming service connection is received by the terminal that has received the streaming service access information, transmitting the converted content to stream the converted content to the terminal. It provides a method of providing a video service on demand to deliver the content.

As described above, according to the present invention, by providing a content conversion function, by converting and providing the content to be suitable for the terminal in the mobile environment, there is an effect of providing the on-demand video service to the user can play the content seamlessly. .

In addition, according to the present invention, by providing a content conversion function and a caching technique for the converted content, by providing the pre-cached converted content suitable for the terminal in the mobile environment, the user starts seamless content playback and rapid content playback There is an effect of providing an on-demand video service that enables.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function is obvious to those skilled in the art or may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a diagram illustrating an on-demand video service system for transmitting content by providing a content conversion function using a caching technique according to the present invention.

1 is a VOD service system that receives a request for a Video On Demand (V0D, hereinafter referred to as VOD) service from a terminal that wants to receive content, and transmits the content to the corresponding terminal to provide a VOD service. As a diagram of the present invention, the content provided by the VOD service system to the terminal is a content whose resolution and data capacity are converted so as to be played on the terminal. In addition, the VOD system according to the present invention converts the entire content and then transmits the converted content and the converted content independently, instead of transmitting the converted content to the corresponding terminal. The converted content will be transmitted in real time. As the content conversion function and the conversion content transmission function are performed independently and in real time, the converted content can be transmitted to the terminal more quickly without waiting for the time required to convert the entire content, but the conversion content transmission function is relatively There is a problem that the converted content to be transmitted may be depleted according to the performance of the content conversion function that may cause a long delay, so that the converted content to be played in the corresponding terminal does not arrive in time, There is a problem that can cause a disconnection phenomenon. Therefore, it is an object of the present invention to perform such a content conversion function and to prevent the interruption in the reproduction of the converted content. This object is achieved by accepting the content conversion function and the caching technique for the converted content. That is, once the converted content is cached, when the VOD service request for the pre-cached converted content occurs, the converted content is quickly transmitted to the corresponding terminal without performing the content conversion function, thereby causing a break in playback of the converted content. Will be able to prevent.

Referring to FIG. 1, a VOD system providing a VOD service to a terminal receives an on-demand video service request message including terminal information and content information from a terminal, and corresponds to content information included in the received on-demand video service request message. The application server 110 generating a streaming service access information based on the received converted content caching confirmation response message, and receiving a streaming service access request message based on the received converted content caching confirmation response message. To send the converted content request message, and receives the streaming server 120 and streaming content caching confirmation request message from the application server to receive the converted content for the content from the application server, and retrieves the converted content for the content to convert Content caching After transmitting the response message to the application server, and receives the converted content request message from the streaming server, retrieve the group is converted to a pre-stored converted content is configured to include a contents convert server 130 to be transmitted to the streaming server.

The above-described application server 110 includes a session information DB (Data Base) for storing the terminal information and content information included in the received on-demand video service request message, the content information stored in the session information DB for the corresponding content Contains content storage path information.

The above-described content conversion server 130 includes a conversion content storage unit for caching converted content that is newly encoded and converted content, and a converted content list DB for storing converted content information about the converted content cached in the converted content storage unit. The converted content information includes content information including identification information about the content before conversion and identification information about the converted content.

The content conversion server 130 having received the converted content caching confirmation request message determines whether the converted content for the content is cached in the converted content storage unit based on the content information included in the converted content caching confirmation request message. It confirms from the converted content list information previously stored in the DB, and generates a converted content caching confirmation response message including the confirmed caching information and transmits it to the application server 110.

When the above-described application server 110 recognizes that the converted content for the content is cached by the content conversion server 130 based on the checked caching information included in the received converted content caching confirmation response message, The streaming service access information and the content information are transmitted to the terminal 100. Here, the streaming service refers to a service that enables a terminal user to select and play a section by moving to a specific playback time desired by the terminal user when playing the corresponding content.

The streaming service connection request message received by the streaming server 120 includes a terminal (or terminal) to which the streaming server 120 is connected after the application server 110 transmits the above-mentioned streaming service connection information to the terminal 100. It is a streaming service request message received from 100).

The streaming server 120 receiving the aforementioned streaming access request message transmits the converted content request message for requesting the converted content for the corresponding content to the content conversion server 130, and transmits the converted content from the content conversion server 130. While receiving, the converted content received in real time is streamed to the terminal 100.

The content conversion server 130 receiving the above-described converted content request message checks the converted content information on the converted content list information pre-stored in the converted content list DB, and converts the converted content cached in the converted content storage unit into a streaming server ( By transmitting to 120, the converted content is transmitted to the terminal 100.

When the above-described application server 110 recognizes that the converted content for the content is not cached by the content conversion server 130 based on the confirmed caching information included in the received converted content caching whether or not response message, The live service access information and the content information are transmitted to the terminal 100. Here, the live service means a service in which the terminal user cannot select a section when the terminal user plays the corresponding content.

The live service connection request message received by the streaming server 120 is the terminal 100 to which the streaming server 120 is connected after the application server 110 transmits the above-mentioned live service connection information to the terminal 100. Live service request message from).

The streaming server 120 receiving the above-described live service connection request message transmits a content conversion request message for the corresponding content to the content conversion server 130, and converts the content from the content conversion server 130 in real time. While receiving the converted content, the converted content received in real time is streamed (transmitted) to the terminal.

The content conversion server 130 receiving the aforementioned content conversion request message,

Converts the corresponding content, transmits the converted converted content to the streaming server 120 in real time, caches the converted converted content in the converted content storage in real time, and converts the converted content information about the converted converted content into cached content. It is stored in the list DB. When the converted content cached in the converted content storage unit requests a VOD service for the same content, the converted content can quickly provide a streaming service to the terminal without a content conversion process.

2 is a diagram illustrating a content conversion server that provides a content conversion function using a caching technique to provide an on-demand video service according to the present invention.

2, the content conversion server 130 that provides a content conversion function using a caching technique to provide a VOD service according to the present invention receives a conversion content caching confirmation request message from the application server, the conversion content request Pre-stored in the message receiving unit 132 for receiving the message from the streaming server, the converted content list DB 135 for storing the converted content information, the converted content storage unit 136 for caching the converted content, and the converted content list DB 135 A converted content list retrieval management unit 133 for retrieving the converted content information, a message transmission unit 131 for transmitting a converted content caching whether acknowledgment message including the search result information from the converted content list retrieval management unit 133, and the application server; When the conversion content request message is received from the streaming server in the message receiving unit 131, the conversion cone It is configured to include the converted content transmitter 137 for transmitting the converted content cached in the storage unit Flats 136 to the streaming server.

The converted content information about the converted content, which is searched by the above-described converted content list search management unit 133 and stored in the converted content list DB 135, includes content information including identification information about the pre-converted content and the converted content. Contains identification information.

After the message receiving unit 132 in the content conversion server receives the request for confirmation of converted content caching from the application server, the converted content list search management unit 133 converts the converted content of the corresponding content from the converted content list DB 135. Search. The reason for searching is to check if the content has been converted before.

When the converted content content search is performed by the above-described converted content list search management unit 133, the converted content caching confirmation response message including the search information is transmitted from the message transmitter 131 to the application server. That is, the search for the converted content information by the above-described converted content list search management unit 133 means that the content conversion function for the corresponding content has been performed in advance. The application server receiving the conversion content caching confirmation response message including the above-mentioned search information transmits streaming service access information to the terminal, so that the terminal requests a streaming service access request message for requesting a streaming service capable of selecting a section. Is transmitted to the streaming server, and the streaming server receiving the transmission of the converted content request message to the message receiving unit 132 of the content conversion server 130.

When the message receiving unit 132 of the content conversion server 130 receives the above-described converted content request message, the content information or the converted content information included in the converted content request message is checked, and the converted content sending unit 137 checks the identified content. The pre-cached converted content corresponding to the information or the converted content information is transmitted to the streaming server.

When the previously stored converted content information is not retrieved by the above-described converted content list retrieval management unit 133, the converted content caching whether acknowledgment message including the unretrieved information is transmitted from the message transmitter 131 to the application server. . In other words, when the converted content information is not retrieved by the above-described converted content list retrieval management unit 133, the content conversion function for the corresponding content has not been performed in advance. The application server receiving the converted content caching confirmation response message including the unsearched information mentioned above transmits the live service access information to the terminal, whereby the terminal requests a live service access request message for requesting a live service in which the section selection function is not available. When the transmission to the streaming server, the streaming server receiving the transmission of the content conversion request message to the message receiving unit 132 of the content conversion server 130.

When the message receiving unit 132 of the content conversion server 130 receives the above-described content conversion request message, it checks the content information included in the content conversion request message and generates the converted content corresponding to the identified content information. , Referring to FIG. 2, the content conversion server 130 further includes a content conversion unit 136 performing such a conversion content generation function.

The converted content generated by the content converting unit 136 is transmitted to the streaming server in real time by the converted content transmitting unit 137 and cached in the converted content storing unit 136. In addition, the converted content information on the generated converted content is stored in the converted content list DB 135.

The reason for storing the converted content for the converted content generated by the content conversion unit 136 and storing the converted content information is that the converted content is quickly cached without requesting the content conversion process when the converted content is requested from the streaming server. To send content.

3 is a conceptual diagram illustrating an on-demand video service for transmitting content by providing a content conversion function using a caching technique according to the present invention.

3 is a view for conceptually explaining that after providing a VOD service by performing a content conversion function on a content in advance, when a VOD service request for the same content is received, the converted content of the requested content is transmitted to the requesting terminal. to be.

Referring to FIG. 3, by the provided VOD service, the converted content A pre-converted from the content A is pre-cached in the converted content storage in the content conversion server, and thus the converted content information for the converted content A is also stored in advance. Assume a situation.

Referring to FIG. 3, when the application server receives the VOD service request message for the content A from the terminal 100, the content A is converted and retrieved the converted content information for the stored converted content A. Since the converted content information is assumed to be stored in advance, the search will be performed.

Accordingly, the application server transmits the streaming access information capable of selecting a section to the terminal 100, and the streaming server 120 receives the streaming service access request message from the terminal 100, and thus the content conversion server 130. Will send the converted content request message. The subsequent process is represented in FIG. 3.

Referring to FIG. 3, the content conversion server 130 converts the pre-cached converted content A for the converted content request message received from the streaming server 120 to the streaming server 120 without the content conversion process of the content A. And the streaming server 120 receives the converted converted content A to the terminal 100 so that the terminal converts the converted content A appropriately for the terminal to the content A requested for the VOD service. It can receive and play in real time without interruption.

4 is a flowchart illustrating a method for providing an on-demand video service for transmitting content by providing a content conversion function using a caching technique according to the present invention.

Referring to FIG. 4, a method for providing an on-demand video service in an on-demand video service system includes receiving an on-demand video service request request (s400) for receiving an on-demand video service request message including content information from a terminal (s400). Content information storage step (s402), the conversion content caching step to check whether the converted content corresponding to the stored content information is cached (s404), if the converted content is cached, streaming service for transmitting streaming service access information to the terminal When the access information is transmitted (s406) and the streaming service is accessed by the terminal that has received the streaming service access information, a converted content transmission step (s408) for streaming the converted content to the terminal is performed.

When it is confirmed that the converted content corresponding to the stored content information is not cached by the above-mentioned converted content caching check step (s404), after the above-mentioned converted content caching check step (s404), the live service access information is transmitted to the terminal. The live service access information transmission step s410 is performed.

After the live service connection information transmission step (s410), if a live service connection is made by the terminal that has received the live service access information, the converted content corresponding to the previously stored content information is generated in the above-described content information storage step (s402). While performing the content conversion and conversion content transmission step (s412) to transmit in real time.

In the above-mentioned content conversion and conversion content transmission step (s412), the content is converted to generate the converted content, the generated converted content is cached, and the converted content information about the generated converted content is stored. The caching of the converted content and the storage of the converted content information are to provide the converted content promptly when a VOD service request is made for the same content next time.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, the present invention is applied to an on-demand video service or a content transmission technology to provide a content conversion function and a caching technique for the converted content, thereby providing a pre-cached converted content suitable for a terminal in a mobile environment. It is a very useful invention that has the effect of providing users with on-demand video services that enable seamless content playback and rapid start of content playback.

1 is a diagram illustrating an on-demand video service system for transmitting content by providing a content conversion function using a caching technique according to the present invention;

2 is a view showing a content conversion server providing a content conversion function using a caching technique to provide an on-demand video service according to the present invention;

3 is a conceptual diagram illustrating an on-demand video service for transmitting content by providing a content conversion function using a caching technique according to the present invention;

4 is a flowchart illustrating a method for providing an on-demand video service for transmitting content by providing a content conversion function using a caching technique according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: terminal 110: application server

120: streaming server 130: content conversion server

131: message transmitter 132: message receiver

133: converted content list search management unit

134: content conversion unit 135: conversion content list DB

136: converted content storage unit 137: converted content transmission unit

Claims (23)

In the on-demand video service system for providing an on-demand video service to a terminal, Receives the on-demand video service request message including the terminal information and content information from the terminal, transmits the conversion content caching confirmation request message for the content corresponding to the content information, based on the received conversion content caching confirmation response message An application server for generating raw streaming service connection information; A streaming server for receiving a streaming service access request message, transmitting a converted content request message, and streaming the converted content request message to the terminal while receiving the converted content for the content; And Receive the converted content caching confirmation request message from the application server, retrieves the converted content for the content and sends the converted content caching confirmation response message to the application server, the converted content request message to the streaming server After receiving from the content conversion server to retrieve the converted content pre-converted and stored in advance to the streaming server On-demand video service system for transmitting content by providing a content conversion function using a caching technique comprising a. The method of claim 1, The application server, And a session information DB for storing the terminal information and the content information included in the on-demand video service request message and transmitting content by providing a content conversion function using a caching technique. The method of claim 2, And the content information stored in the session information DB includes content storage path information of the content, and provides a content conversion function using a caching technique to transmit content. The method of claim 1, The content conversion server, A caching technique comprising a converted contents storage unit for caching the converted contents converted by encoding the contents, and a converted contents list DB for storing the converted contents information of the cached converted contents in the converted contents storage unit. On-demand video service system for transmitting content by providing a content conversion function using. The method of claim 4, wherein The content conversion server receiving the conversion content caching confirmation request message, Checking whether the converted content for the content is cached in the converted content storage unit from the converted content information previously stored in the converted content list DB based on the content information included in the converted content caching confirmation request message, and On-demand video service system for transmitting the content by providing a content conversion function using a caching technique, characterized in that for generating the converted content caching confirmation response message containing the confirmed caching information whether to transmit to the application server. The method of claim 5, The application server, On the basis of the checked caching information included in the received converted content caching or not acknowledgment message, if the converted content for the content is cached in the content conversion server, the streaming service access information and the content information And a content conversion function using a caching technique to transmit the content to the terminal. The method of claim 5, The application server, On the basis of the confirmed caching information included in the converted content caching confirmation response message, if the content conversion server recognizes that the converted content for the content is not cached, the live service instead of the streaming service access information And a content conversion function using a caching technique to transmit content by generating access information and transmitting the live service access information and the content information to the terminal. The method of claim 6, After the application server transmits the streaming service access information to the terminal, the streaming server transmits content by providing a content conversion function using a caching technique, characterized in that the streaming service access request message is received from the terminal. Video service system on demand. The method of claim 7, wherein After the application server transmits the live service access information to the terminal, the streaming server provides a content conversion function using a caching technique to transmit content by receiving a live service access request message from the terminal. Video on demand system. The method of claim 8, The streaming server receiving the streaming service access request message, Sending the converted content request message for requesting the converted content for the content to the content conversion server, receiving the converted content from the content conversion server, and streaming the received converted content to the terminal. An on-demand video service system for transmitting content by providing a content conversion function using a caching technique. The method of claim 10, The content conversion server receiving the converted content request message, Confirming the converted content information on the converted content list information pre-stored in the converted content list DB, and converts the converted content cached in the converted content storage unit to the streaming server content conversion using a caching technique Video-on-demand system that delivers content by providing functionality. The method of claim 9, The streaming server receiving the live service access request message, Streaming the received converted content to the terminal while transmitting a content conversion request message for the content to the content conversion server and receiving the converted content being converted in real time for the content from the content conversion server. On-demand video service system for transmitting content by providing a content conversion function using a caching technique. The method of claim 12, The content conversion server receiving the content conversion request message, Convert the content, send the converted content as the converted content to the streaming server in real time, cache the converted content in the converted content storage unit, and convert the converted content information for the converted content into the converted content list. On-demand video service system for transmitting content by providing a content conversion function using a caching technique, characterized in that stored in the DB. In the content conversion server that provides a content conversion function to provide a video service on demand to a terminal, A message receiving unit receiving a converted content caching request message and a converted content request message; A converted content list DB for storing converted content information about the converted content; A converted content storage unit for caching the converted content; A converted content list search management unit for searching the converted content information previously stored in the converted content list DB; A message transmitter for transmitting a converted content caching confirmation response message including search result information in the converted content list search manager; And When the converted content request message is received at the message receiving unit, the converted content transmitting unit transmitting the cached converted content to the converted content storage unit. Content conversion server providing a content conversion function using a caching technique to provide an on-demand video service comprising a. The method of claim 14, The converted content information, A content conversion server providing a content conversion function using a caching technique to provide an on-demand video service comprising content information including identification information of the content before conversion and the identification information of the converted content. The method of claim 14, The message receiving unit provides a content conversion function using a caching technique to provide an on-demand video service when the previously stored converted content information is not retrieved by the converted content list retrieval management unit. Content Conversion Server. The method of claim 16, When the message receiving unit receives the content conversion request message, further comprising a content conversion unit for checking the content information included in the content conversion request message, and generates a conversion content corresponding to the identified content information Content conversion server that provides a content conversion function using a caching technique to provide an on-demand video service. The method of claim 17, The content conversion unit, And a content conversion function using a caching technique to provide the on-demand video service, wherein the generated converted content is cached in the converted content storage unit. The method of claim 17, The content conversion unit, And a content conversion function using a caching technique to provide the on-demand video service, wherein the converted content information corresponding to the generated converted content is stored in the converted content list DB. In the method for providing on-demand video service in the on-demand video service system, (a) receiving an on-demand video service request request for receiving an on-demand video service request message including content information from a terminal; (b) a content information storage step of storing the content information; (c) checking whether the converted content is cached to determine whether the converted content corresponding to the stored content information is cached; (d) transmitting streaming service access information for transmitting streaming service access information to the terminal if the converted content is cached; And (e) a conversion content transmission step of streaming the converted content to the terminal when the streaming service connection is received by the terminal that has received the streaming service access information; Method for providing on-demand video service to deliver the content by providing a content conversion function using a caching technique comprising a. The method of claim 20, If it is confirmed by the step (c) that the converted content corresponding to the stored content information is uncached, After the step (c), Live service access information transmission step of transmitting the live service access information to the terminal is provided, the on-demand video service providing method for transmitting content by providing a content conversion function using a caching technique. The method of claim 21, After the live service access information transmission step, When the live service connection is made by the terminal that has received the live service access information, in step (b), a content conversion and conversion content transmission step of generating a converted content corresponding to the stored content information and transmitting in real time is performed. A method of providing an on-demand video service for transmitting content by providing a content conversion function using a caching technique. The method of claim 22, In the content conversion and conversion content transmission step, And a content conversion function using a caching technique, wherein the generated converted content is cached and the converted content information of the generated converted content is stored.

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