KR20090113506A - Scalable video provide system and scalable video provide method - Google Patents

Abstract

A scalable video providing system and a scalable video providing method capable of effectively lowering the data transfer rate at the time of enhanced video streaming and maintaining the reliability in a playback environment of scalable video in response to an attempt to play back video enhanced more than previously stored video is disclosed have. The scalable video providing system according to the present invention is characterized in that when a terminal device is to reproduce a third scalable video which is higher than the previously stored first scalable video in the terminal device, When the scalable video is requested to an external content providing server, the content providing server extracts the requested second scalable video from the corresponding content, and provides the stream to the terminal, and the second scalable video to be streamed And arranging the first scalable video to reproduce the enhanced third scalable video.

Description

[0001] SCALABLE VIDEO PROVIDING SYSTEM AND SCALABLE VIDEO PROVIDE METHOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scalable video providing system, and more particularly, to a scalable video providing system in which, in a scalable video playback environment, When only video is requested, effectively extracting only additional video from the corresponding content corresponding to the request and providing streaming, the enhanced video is played back using the pre-stored video and the streamed additional video, thereby effectively lowering the data transmission rate at the time of streaming, To a scalable video providing system, a scalable video providing method, a terminal device, a content providing server, and a control method thereof.

2. Description of the Related Art [0002] In recent years, as contents (particularly, video contents) have been exchanged (transmitted / received) actively, various methods for coding video to transmit / receive video contents effectively have been developed. Especially. It is expected that the video (hereinafter referred to as SVC video) encoded in accordance with the SVC (Scalable Video Coding) method standardized as H.264 Salable Extension will be greatly increased in the future.

Describing SVC video, it is possible to distinguish a bit stream that contributes to each resolution, frame rate, and picture quality as video encoded according to the SVC scheme. According to the SVC scheme, a layer of an SVC is composed of one base layer and one or more enhancement layers that can be stacked consecutively on a base layer, The maximum resolution, frame rate, and image quality can be expressed. SVC video can support various resolutions, frame rates, and picture quality as the number of consecutive expansion layers increases.

Accordingly, a playback apparatus that receives SVC video streaming and plays back SVC video having an appropriate resolution, frame rate, and image quality according to the state of the network (e.g., transfer rate) and the situation of the playback apparatus itself Download, or stream and receive and play. Particularly, a playback apparatus for playing SVC video is capable of playing back low-resolution SVC video (hereinafter, referred to as first SVC video) or high-resolution, high frame rate, high-quality SVC video (hereinafter referred to as a third SVC video May be selectively downloaded or streamed and played back.

As described above, the playback apparatus capable of selectively reproducing the first SVC video or the third SVC video has played back the first SVC video in the past and stores it. However, as the state of the network is improved, If you want to play 3SVC video, stream the enhanced third SVC video over the network.

However, in the conventional case of reproducing the enhanced third SVC video in the state where the first SVC video is stored, since the improved third SVC video is streamed without using the pre-stored first SVC video containing the same contents at all, There is a problem that the data transmission rate becomes very high and the network resources are consumed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and apparatus for reproducing a third scalable video having a higher scalability than previously stored first scalable video, A terminal device that transmits a request query requesting a second scalable video that is further required based on the scalable video to an external device; and a control unit that searches the corresponding content, which is requested based on the request query, And a content providing server for providing the second scalable video corresponding to the scalable video except for the first scalable video in the searched content to the terminal device. The scalable video providing system includes the enhanced video streaming Effectively reducing the data transmission rate of the first time, The scale and scalable video encoding conditions to provide a second scalable video accordingly to search the same content to the terminal device.

Another object to be achieved by the present invention is to provide a query receiver for receiving a predetermined request query from an arbitrary terminal apparatus via an external network, A query analyzing unit for searching for a corresponding content requested based on the request query if it is input; and a search unit for searching for a content corresponding to the scalable video excluding the first scalable video stored in the terminal based on the request query, And a video transmission unit for transmitting the second scalable video to the terminal apparatus via the network, wherein the data transmission rate at the time of enhanced video streaming is In addition to effectively lowering the second scalable ratio It is to maintain the reliability of five.

It is another object of the present invention to provide a method and apparatus for reproducing a third scalable video having higher scalability than previously stored first scalable video, Transmitting a request query requesting a second scalable video that is further required based on the first scalable video to an external content providing server; and receiving, when the request query is received, The content providing server extracts the second scalable video corresponding to the remaining scalable video except for the first scalable video from the content searched by the content providing server and transmits the extracted second scalable video to the terminal device Providing a scalable video providing method comprising: The second is to maintain the reliability of a scalable video, with lowering the transmission rate at the time of video stream effectively.

It is another object of the present invention to provide a method and apparatus for reproducing the third scalable video having higher scalability than previously stored first scalable video, Transmitting a request query for requesting the second scalable video, which is further required based on the first scalable video, to an external content providing server; and when the second scalable video is received from the content providing server, And processing the first scalable video and the second scalable video and outputting the third scalable video. The present invention provides a control method of a terminal device that effectively lowers a data transmission rate at the time of enhanced video streaming And to maintain the reliability of the second scalable video.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a scalable video providing system for reproducing a third scalable video having a higher scalability than a previously stored first scalable video, A terminal device for transmitting a request query requesting a second scalable video which is further required based on the scalable video to the outside; And searching the corresponding content requested based on the request query, and transmitting the second scalable video corresponding to the remaining scalable video excluding the first scalable video from the retrieved content to the terminal And a content providing server provided to the apparatus.

Advantageously, the scalable video may include SVC video encoded according to a Scalable Video Coding (SVC) scheme.

According to a second aspect of the present invention, there is provided a terminal apparatus for processing scalable video comprising: a video storage unit for storing a first scalable video; A video processing unit for processing the first scalable video and the second scalable video stored in the video storage unit and outputting the third scalable video when the second scalable video is received from an external content providing server; And to request the second scalable video that is further requested based on the first scalable video when it is desired to reproduce the third scalable video having higher scalability than the previously stored first scalable video, A video controller for outputting content information; And a request unit for generating a request query requesting the second scalable video based on the requested content information and transmitting the generated request query to the content providing server.

The request unit may include a request query generator for generating the request query requesting the second scalable video based on the requested content information output from the video controller, And a request query transmitting unit for transmitting the request query to the content providing server through an external network.

Preferably, the request query includes content name information corresponding to the first scalable video, content codec information, encoding variable information, scalability information, and scalability of the third scalable video to be reproduced And / or information.

Preferably, the video processing unit is configured to read the first SVC video stored in the video storage unit, to perform NAL (Network Abstraction Layer) units of the second SVC video stream-received from the content providing server, And outputs the third SVC video by arranging the NAL units of the first SVC video based on the time stamp.

Preferably, the apparatus further includes a video receiver receiving the scalable video streamed from the external content providing server and outputting NAL (Network Abstraction Layer) units included in the packet of the scalable video to the video processor .

According to a third aspect of the present invention, there is provided a content providing server for providing scalable video comprising: a query receiving unit for receiving a predetermined request query from an arbitrary terminal apparatus through an external network; A query analyzer for searching for the requested content based on the request query when the request query is input from the query receiver; A video extracting unit for extracting a second scalable video corresponding to the remaining scalable video from which the first scalable video stored in the terminal device is excluded from the retrieved content based on the request query; And a video transmission unit transmitting the second scalable video to the terminal device via the network.

Preferably, the request query received from the terminal device includes content name information corresponding to the first scalable video already stored in the terminal device, content codec information, encoding variable information, scalability information, And scalability information of the third scalable video corresponding to the content.

Preferably, the query analyzing unit analyzes at least one of the content name information, the content codec information, the encoding variable information, and the required scalability video scalability information included in the request query The third scalable video corresponding to the corresponding content, and output the information included in the request query to the video extracting unit.

Preferably, the video extracting unit extracts the first scalable video from the retrieved third scalable video based on the scalability information of the first scalable video among the information included in the request query input from the query analyzing unit, The NAL (Network Abstraction Layer) unit according to the scalability information of the scalable video is removed, and the second scalable video corresponding to the remaining scalable video can be extracted and output.

The content analyzing unit may further include a content DB for storing content corresponding to at least one scalable video having different scalability and providing the content extracted by the query analyzing unit to the video extracting unit.

The content stored in the content DB may include metadata including at least one of content codec information, encoding parameter information, and scalability information.

According to a fourth aspect of the present invention, there is provided a scalable video providing method in which when a third scalable video having higher scalability than a previously stored first scalable video is to be played back, Transmitting a request query requesting an additional required second scalable video to an external content providing server based on the first scalable video; Retrieving the requested content based on the request query if the request query is received; And extracting the second scalable video corresponding to the scalable video excluding the first scalable video from the content searched by the content providing server and providing the extracted second scalable video to the terminal.

According to a fifth aspect of the present invention, there is provided a method of controlling a terminal device, comprising the steps of: when the third scalable video having higher scalability than a previously stored first scalable video is to be played back, Transmitting, to an external content providing server, a request query for requesting the second scalable video which is further required based on the good video; And processing the first scalable video and the second scalable video and outputting the third scalable video when the second scalable video is received from the content providing server.

Advantageously, transmitting the request query comprises: outputting requested content information for requesting the second scalable video further requested based on the first scalable video; Generating the request query requesting the second scalable video, and transmitting the generated request query to the content providing server through an external network.

Preferably, the request query includes content name information corresponding to the first scalable video, content codec information, encoding variable information, scalability information, and scalability of the third scalable video to be reproduced And / or information.

A control method of a content providing server according to a sixth aspect of the present invention for achieving the above object is a control method of a content providing server according to the sixth aspect of the present invention, when a predetermined request query is received from an arbitrary terminal apparatus via an external network, Searching; Extracting a second scalable video corresponding to the remaining scalable video excluding the first scalable video stored in the terminal device from the retrieved content based on the request query; And transmitting the extracted second scalable video to the terminal device via the network.

Preferably, the searching step may include at least one of the content name information, the content codec information, the encoding variable information, and the scalability information of the requested third scalable video included in the request query And searching for the third scalable video corresponding to the corresponding content.

Preferably, the extracting step may include extracting, from the retrieved third scalable video, scalability information of the first scalable video based on scalability information of the first scalable video included in the request query And extracting the second scalable video corresponding to the remaining scalable video by removing the NAL (Network Abstraction Layer) unit according to the second scalable video.

According to the scalable video providing system and the scalable video providing method of the present invention, when an enhanced third SVC video other than the first SVC video having a low resolution, a low frame rate, and a low quality is to be reproduced, Only the second SVC video which is further required for reproducing the third SVC video is streamed from the external SVC contents providing server and the sorted third SVC video is sorted by aligning the first SVC video and the second SVC video, The transmission rate can be effectively lowered.

In addition, according to the scalable video providing system and the scalable video providing method of the present invention, when searching / extracting a second SVC video that is further required, not only the content name but also a codec according to the same standard as the first SVC video, It is possible to provide the terminal device 100 with the optimal second SVC video suitable for addition to the first SVC video by retrieving the content corresponding to the scalability information of the third SVC video and extracting the second SVC video therefrom The reliability of the second SVC video can be maintained.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic diagram of a scalable video providing system according to the present invention.

1, a scalable video providing system according to the present invention includes a content providing server 200 for providing scalable video, a scaler 200 for providing a scalable video stream from the content providing server 200 via the network 10, And a terminal device 100 that receives and reproduces a playable video.

Herein, the scalable video may include SVC video encoded according to the SVC (Scalable Video Coding) method. Hereinafter, the scalable video is assumed to be SVC video encoded according to the SVC scheme, 200 is an SVC contents providing server 200 for providing SVC video streaming.

The SVC contents providing server 200 streams the contents corresponding to the SVC video encoded according to the SVC (Scalable Video Coding) method through the network 10. When the SVC contents providing server 200 receives a request query for reproducing a third SVC video having higher scalability than the previously stored first SVC video from the terminal device 100 to be described later, The second SVC video corresponding to the scalable video other than the first SVC video may be streamed to the terminal device 100 by searching for the requested corresponding content.

In a case where the terminal apparatus 100 stores the first SVC video and reproduces the third SVC video having higher scalability than the previously stored first SVC video, the terminal apparatus 100 transmits the second SVC video, which is further required based on the previously stored first SVC video, To the SVC contents providing server 200 and reproduce the third SVC video using the previously stored first SVC video and the second SVC video streamed from the SVC contents providing server 200. [

Hereinafter, the configuration of the terminal device 100 will be described in detail with reference to FIG.

2, the terminal apparatus 100 includes an SVC video storage unit 130 in which first SVC video is stored, and an SVC video storage unit 130 when the second SVC video is received from the SVC contents providing server 200 An SVC video processing unit 140 for processing a first SVC video and a second SVC video stored in the storage unit 130 and outputting a third SVC video and a third SVC video having a higher scalability than the previously stored first SVC video, An SVC video control unit 120 for outputting requested content information for requesting a second SVC video which is additionally requested based on the one SVC video, a request query requesting the second SVC video based on the requested content information, To the SVC contents providing server 200 through the requesting unit 110.

In addition, the terminal device 100 may further include an SVC video receiving unit 150.

The SVC video storage unit 130 is a storage unit for storing the SVC bitstream of the first scalable video, i.e., the first SVC video.

Here, the first SVC video is preferably low-resolution, low frame rate, and low-quality video.

The SVC video receiving unit 150 receives the SVC bit stream (SVC additional bit stream) of the second SVC video streamed from the external SVC contents providing server 200 through the network 10 and transmits the packet of the received SVC bit stream (Network Abstraction Layer) units included in the SVC video processing unit 140 to the SVC video processing unit 140.

The SVC video controller 120 may be configured to read the first SVC video of the SVC video storage 130 in order to reproduce the third SVC video having higher scalability than the first SVC video previously stored in the SVC video storage 130 SVC video processing unit 140 and outputs requested content information to the request unit 110 for requesting the second SVC video that is further requested based on the first SVC video. Here, when a third SVC video having higher scalability than the previously stored first SVC video is desired to be played back, a case where a playback request is input to the SVC video controller 120 as the third SVC video playback is selected by the user As an example.

Here, it is preferable that the third SVC video has higher scalability than the first SVC video as the enhanced video having the same content as the first SVC video which is low-resolution, low frame rate, low-quality video and has high resolution, high frame and high image quality Do.

The lumbar vertebrae information output by the SVC video controller 120 includes content name information corresponding to the first SVC video, content codec information corresponding to the first SVC video, encoding variable information corresponding to the first SVC video, The scalability information corresponding to one SVC video, and the scalability information of the third SVC video required to be reproduced.

Here, explaining the scalability information, the NAL unit defined in H.264 includes scalability information including at least one of resolution information, frame rate information, image quality information, and layer number information of the corresponding NAL unit . Accordingly, the higher the value of the resolution information, the frame rate information, the image quality information, and the layer number information, the higher the resolution, the higher the frame rate, the higher the image quality.

The SVC video control unit 120 receives the first SVC video from the SVC video storage unit 130 corresponding to the reproduction timing of the third SVC video based on the scalability information of the third SVC video output from the SVC video processing unit 140, It is preferable to control the read timing of the SVC video processing unit 140 to be described later so as to read the NAL unit of the SVC bitstream of the SVC bitstream.

The requesting unit 110 requests the second SVC video to the external SVC contents providing server 200 through the network 10. [ The request unit 110 includes a request query generation unit 113 and a request query transmission unit 117.

The request query generation unit 113 generates a request query for requesting a second SVC video that is further requested based on the requested content information output from the SVC video control unit 120. [

In other words, the request query generating unit 113 generates content data based on the content name information, the content codec information, the encoding variable information, the scalability information, and the third SVC And a scalability information of the video.

Such a request query can be represented in the following format.

Content name Content codec Encoding variable The scalability information of the first SVC video Scalability information of the requesting third SVC video

As described above, the request query generating unit 113 generates the request query of the above-described type for requesting the second SVC video corresponding to the SVC additional bit stream for playing back the third SVC video to be played back using the previously stored first SVC video And outputs it to the request-request transmitting unit 117.

The request query transmitting unit 117 transmits the request query generated by the request query generating unit 113 to the SVC contents providing server 200 via the external network 10. [

The SVC video processing unit 140 reads the SVC bit stream of the first SVC video stored in the SVC video storage unit 130 in units of NAL units. At this time, under the control of the SVC video control unit 120, the SVC video processing unit 140 starts to read the first SVC video in the SVC video storage unit 130, and converts the SVC bit stream of the first SVC video into the NAL unit It is preferable that the read timing to be read is controlled.

The SVC video processing unit 140 receives the SVC bitstream of the second SVC video, that is, the SVC additional bitstream, which is streamed from the external SVC content providing server 200 through the SVC video receiving unit 150, And outputs the SVC bitstream of the third SVC video.

Here, the second SVC video is further required for the SVC bitstream of the first SVC video to reproduce the enhanced third SVC video having high resolution, high frame, and high image quality using the first SVC video of low resolution, low frame rate, It is preferable that the SVC video corresponds to an SVC bitstream including NAL units.

That is, the SVC video processing unit 140 receives the SVC bit stream corresponding to the second SVC video streamed from the SVC contents providing server 200 through the SVC video receiving unit 150, that is, the Network Abstraction Layer units and the NAL units of the SVC bitstream of the first SVC video that have been read are arranged into one SVC bitstream based on the timestamp. The SVC video processing unit 140 outputs a single SVC bitstream, i.e., the SVC bitstream of the third SVC video, to a playback processing unit (not shown) not shown.

Here, the playback processing unit (not shown) is a processing function unit for playing back the SVC bit stream, and performs a conventional general processing routine, so that its detailed configuration and description will be omitted.

Accordingly, when the terminal apparatus 100 according to the present invention intends to reproduce the improved third SVC video instead of the first SVC video having a low resolution, a low frame rate and a low image quality, the terminal apparatus 100 reproduces the third SVC video using the first SVC video It is possible to request only the second SVC video, which is further required for the SVC contents providing server 200, to stream the received SVC contents, and align the first SVC video and the second SVC video to reproduce the enhanced third SVC video to be played back.

Hereinafter, the configuration of the SVC contents providing server 200 will be described in detail with reference to FIG.

3, the SVC contents providing server 200 includes a query receiving unit (not shown) for receiving a predetermined request query from an arbitrary terminal apparatus (hereinafter referred to as the terminal apparatus 100) via the external network 10 A query analyzing unit 220 for searching for a corresponding content requested based on a request query when a request query is input from the query receiving unit 210 and a second SVC video processing unit 220 for storing the first SVC video A video extracting unit 240 for extracting a second SVC video corresponding to the remaining SVC video from the corresponding content searched for and a video transmitting unit 250 for transmitting the second SVC video to the terminal device 100 via the network 10, .

In addition, the SVC contents providing server 200 may further include a contents DB 230.

The query receiving unit 210 receives the request query from the terminal device 100 through the network 10 and outputs the received request query to the query analyzing unit 220.

The query analyzing unit 220 receives the content name information, the content codec information, the encoding variable information, and the required scalability information of the third SVC video corresponding to the first SVC video included in the request query input from the query receiving unit 210 And searches the corresponding content, i.e., the third SVC video.

3, the query analyzing unit 220 searches for the corresponding content, that is, the third SVC video, or the SVC contents providing server 200 in the content DB 230 included in the SVC contents providing server 200, It is possible to access the content DB server 300 provided outside and retrieve the corresponding content, that is, the third SVC video.

Here, the content DB 230 corresponds to a database storing content corresponding to at least one scalable video having different scalability. Of course, it is also possible that content data corresponding to at least one scalable video having different scalability is stored in the content DB server 300 provided outside. Here, each content stored in the content DB 230 or the content DB server 300 may include metadata including at least one of its content codec information, encoding variable information, and scalability information .

Here, the metadata may be expressed in the following format.

Content codec Encoding variable Scalability information

Hereinafter, a configuration in which the content DB 230 is provided in the SVC contents providing server 200 will be described as an embodiment.

That is, the query analyzing unit 220 searches the content DB 230 for the content corresponding to the content name information of the first SVC video, and extracts the metadata of the searched content of the same name and the scaler of the third SVC video included in the request query The content information of the first SVC video, and the encoding variable information of the first SVC video to search for corresponding content (3SVC video).

This is taken into account in the case where the same content is encoded with the SVC, the compressed SVC bit stream which is the result of encoding according to the encoding condition and the actually used codec is different. That is, there may be a plurality of SVC bit streams for one content in the content DB 230, and an optimal content (third SVC video, which can extract the second SVC video suitable for addition to the first SVC video SVC bitstream) can not be searched. In order to solve this problem, there is a need for a method that can confirm that the same content is a sub bitstream of an SVC bitstream encoded in the same environment.

Accordingly, the query analyzing unit 220 searches not only the content name but also the content corresponding to the scalability information of the third SVC video in consideration of the codec and the encoding variable according to the same standard as the first SVC video, (The SVC bit stream of the third SVC video) capable of extracting the second SVC video suitable for the following.

The content DB 230 provides the video extracting unit 240 with the corresponding content (third SVC video) retrieved by the query analyzing unit 220.

The SVC video extracting unit 240 extracts the second SVC video corresponding to the remaining SVC video excluding the first SVC video stored in the terminal device 100 from the retrieved corresponding content (the third SVC video) based on the request query.

That is, the SVC video extracting unit 240 extracts, from the SVC bitstream of the retrieved third SVC video, based on the scalability information of the first SVC video among the information included in the request query input from the query analyzing unit 220 The NAL (Network Abstraction Layer) unit according to the scalability information of the first SVC video is removed, and the remaining SVC bit stream corresponding to the remaining SVC video can be extracted. The SVC video extractor 240 outputs the extracted remaining SVC bitstream, i.e., the second SVC video, to the SVC video transmitter 250.

The video transmitting unit 250 streams the second SVC video, i.e., the SVC additional bit stream, input from the SVC video extracting unit 240, to the terminal device 100 through the network 10.

Accordingly, the SVC contents providing server 200 according to the present invention can use the first SVC video having the low resolution, the low frame rate, and the low quality to store the SVC additional bit stream from the terminal device 100 that wants to reproduce the enhanced third SVC video When the corresponding second SVC video is requested, the second SVC video optimal for addition to the first SVC video can be retrieved / extracted and provided to the terminal device 100.

As described above, the terminal device 100, the SVC contents providing server 200, and the scalable video providing system including the terminal device 100 according to the present invention are capable of providing a low-resolution, low frame rate, When it is desired to reproduce the enhanced third SVC video rather than the low-quality first SVC video, only the second SVC video required for reproducing the third SVC video using the previously stored first SVC video is transmitted from the external SVC content providing server 200 By streaming and arranging the first SVC video and the second SVC video, it is possible to reproduce the enhanced third SVC video to be reproduced.

As described above, according to the terminal device 100, the SVC contents providing server 200, and the scalable video providing system including the terminal device 100 according to the present invention, when the enhanced third SVC video is to be reproduced, the entire third SVC video is not streamed , The third SVC video is reproduced by only receiving the second SVC video which is further required, so that the data transmission rate at the time of streaming can be effectively lowered.

According to the terminal device 100, the SVC contents providing server 200, and the scalable video providing system including the SVC contents providing server 200 according to the present invention, when retrieving the second SVC video, which is further required, from the DB, , Searches the content corresponding to the scalability information of the third SVC video in consideration of the codec and the encoding parameter according to the same standard as the first SVC video to thereby obtain the optimal second SVC video suitable for adding to the first SVC video to the terminal device 100 So that the reliability of the second SVC video can be maintained.

On the other hand, in the terminal device 100, when the fourth SVC video is streamed and received from the SVC contents providing server 200 in order to reproduce a fourth SVC video not related to the first, second, and third SVC videos, The SVC bitstream of the fourth SVC video received through the video receiver 150 is output to a playback processor (not shown) through the SVC video processor 140 and performs a general processing routine to output video according to the fourth SVC video to the display (70).

Hereinafter, the control flow of the scalable video providing method according to the embodiment of the present invention will be described with reference to FIG. Here, for convenience of explanation, the configurations shown in FIG. 1, FIG. 2, and FIG. 3 will be described with reference to corresponding reference numerals.

First, the terminal device 100 stores a first scalable video having a low resolution, a low frame rate, and a low quality (hereinafter referred to as a first SVC video). Then, it is determined whether the third scalable video (hereinafter, referred to as a third SVC video) having higher scalability than the first SVC video is to be reproduced (S10). If it is desired to reproduce the third SVC video, To the SVC contents providing server 200, a request query requesting a second scalable video (hereinafter referred to as a second SVC video) based on the first SVC video (S20).

Upon receiving the request query, the SVC contents providing server 200 searches for the corresponding content (third SVC video) requested based on the request query (S30), extracts the second SVC video from the retrieved corresponding content, And provides the video stream to the terminal device 100 (S40).

Accordingly, the terminal device 100 can obtain the third SVC video by aligning the stream of the second SVC video and the previously stored first SVC video (S50), and output the aligned third SVC video and reproduce the same (S60). Here, the scalable video includes SVC video encoded according to the SVC (Scalable Video Coding) scheme.

 Hereinafter, a control flow according to the control method of the terminal device 100 in the control flow of the system will be described in more detail with reference to FIG.

First, a first SVC bit stream of a first scalable video having a low resolution, a low frame rate, and a low quality (hereinafter, referred to as a first SVC video) is stored in the terminal device 100 (S110). Then, it is determined whether the third SVC bitstream of the enhanced third scalable video (hereinafter referred to as the third SVC video) having higher scalability than the first SVC video is to be reproduced (S120). Here, it is preferable that the determination in step S120 is implemented by determining whether a playback request is input to the SVC video controller 120 as the third SVC video playback is selected by the user.

If it is desired to reproduce the third SVC video, the SVC video controller 120 outputs the requested content information for requesting the second SVC video to the requesting unit 110 at step S130. The lumbar content information output by the SVC video controller 120 includes content name information corresponding to the first SVC video, content codec information corresponding to the first SVC video, encoding variable information corresponding to the first SVC video, And the scalability information of the third SVC video that is required to be reproduced.

In addition, the SVC video controller 120 may control the SVC video processor 140 to read the first SVC bit stream stored in the SVC video memory 130. [

The request query generation unit 113 of the request unit 110 generates a request query for requesting the second SVC video that is further requested based on the requested content information output from the SVC video control unit 120 S140). At this time, the request query includes at least one of the content name information corresponding to the first SVC video, the content codec information, the encoding variable information, the scalability information, and the scalability information of the third SVC video required to be reproduced.

The request query generation unit 113 transmits the request query to the SVC contents providing server 200 through the external network 10 (S150).

Then, the SVC video processing unit 140 determines whether the second SVC bitstream of the second SVC video requested by the SVC contents providing server 200, that is, the requested SVC additional bitstream, is streaming received (S160) (NAL) units of the first SVC bitstream of the first SVC video and the NAL (Network Abstraction Layer) units of the second SVC bitstream to be streamed (SVC additional bitstream) are aligned to one SVC bitstream based on the timestamp S170). Accordingly, the SVC video processing unit 140 obtains one sorted SVC bitstream, that is, the third SVC bitstream of the third SVC video, and outputs the third SVC bitstream to a playback processing unit (not shown).

Then, an unshown regeneration processing unit (not shown) performs a general decoding processing routine to reproduce the enhanced third SVC video in the terminal device 100 (S180). When the reproduction of the third SVC video is completed or the end is selected by the user (S190), the reproduction of the third SVC video is ended.

Hereinafter, the control flow according to the control method of the SVC contents providing server 200 among the control flows of the system will be described in more detail with reference to FIG.

First, it is determined whether a predetermined request query is received from an arbitrary terminal apparatus (hereinafter referred to as terminal apparatus 100) through the external network 10 (S210). If a request query is received, the query analyzing unit 220 ) Searches the content DB 230 for the requested content based on the request query (S220). Here, each content stored in the content DB 230 may include metadata including at least one of its content codec information, encoding variable information, and scalability information.

In step S220, the content corresponding to the content name information of the first SVC video is searched in the content DB 230 using the information included in the request query, and the meta data of the searched content of the same name is included in the request query (3SVC video) by comparing the scalability information of the third SVC video, the content codec information of the first SVC video, and the encoding variable information of the first SVC video.

That is, the third SVC bitstream of the third SVC video is output to the SVC video extracting unit 240. The SVC video extracting unit 240 extracts the first SVC bitstream from the third SVC video based on the request query The second SVC bitstream of the second SVC video corresponding to the remaining SVC bitstream is extracted (S230). That is, the SVC video extracting unit 240 extracts, from the third SVC bitstream of the retrieved third SVC video, based on the scalability information of the first SVC video among the information included in the request query input from the query analyzing unit 220 The NAL (Network Abstraction Layer) unit according to the scalability information of the first SVC video is removed, and the remaining SVC bit stream corresponding to the remaining SVC video can be extracted.

The SVC video extractor 240 outputs the extracted remaining SVC bitstream, that is, the second SVC bitstream (SVC additional bitstream) to the SVC video transmitter 250, The second SVC bit stream, that is, the SVC additional bit stream, to the terminal device 100 through the streaming terminal 10 (step S240). When the transmission is completed (S250), the streaming transmission of the SVC bit stream of the second SVC video, that is, the SVC additional bit stream, ends.

As described above, according to the scalable video providing method of the present invention, when it is desired to reproduce the enhanced third SVC video other than the first SVC video having low resolution, low frame rate, and low quality stored in the terminal device 100, Only the second SVC video which is further required to reproduce the third SVC video is streamed from the external SVC contents providing server 200 by using the already stored first SVC video and the first SVC video and the second SVC video are aligned, It is possible to reproduce the enhanced third SVC video.

As described above, according to the scalable video providing method of the present invention, when an enhanced third SVC video is to be reproduced, streaming of only the second SVC video, which is further required, is not received and the third SVC video is reproduced Therefore, the data transfer rate at the time of streaming can be effectively lowered.

In addition, according to the scalable video providing method according to the present invention, when retrieving the second SVC video, which is further required, from the DB, not only the content name but also the codec and encoding parameters according to the same standard as the first SVC video, By retrieving the content corresponding to the scalability information of the video, it is possible to provide the terminal device 100 with the optimal second SVC video suitable for addition to the first SVC video, so that the reliability of the second SVC video can be maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

When streaming of the advanced third SVC video is not performed, streaming of only the second SVC video required for reproducing the third SVC video using the previously stored first SVC video is performed without streaming the entire third SVC video, When the scalable video playback system and scalable video providing method of the present invention in which the transfer rate can be effectively lowered and the reliability of the second SVC video can be maintained can be applied, the streaming environment of the scalable video and the streaming network resource utilization The present invention can be very industrially applicable because it is possible to make a very great progress and to have a commercially available or commercially available streaming server and playback apparatus and a streaming playback system to be applied.

1 is a schematic control block diagram of a scalable video providing system according to an embodiment of the present invention.

FIG. 2 is a control block diagram of a terminal device according to an embodiment included in the scalable video providing system according to the present invention.

3 is a control block diagram of an SVC contents providing server according to an embodiment included in the scalable video providing system according to the present invention.

4 is a control flowchart illustrating a scalable video providing method according to an embodiment of the present invention.

5 is a control flowchart illustrating a control flow of a terminal device in a scalable video providing method according to an embodiment of the present invention.

6 is a control flowchart showing a control flow of an SVC contents providing server in a scalable video providing method according to an embodiment of the present invention.

Description of the Related Art

100: terminal device 110:

113: request query generation unit 116: request query transmission unit

120: SVC video control unit 130: SVC video storage unit

140: SVC video processing unit 150: SVC video receiving unit

200: SVC contents providing server 210:

220: query analysis unit 230: content DB

240: SVC video extracting unit 250: SVC video transmitting unit

Claims (25)

A scalable video providing system comprising: When it is desired to reproduce the third scalable video having higher scalability than the previously stored first scalable video, a request query for requesting the second scalable video that is further required based on the previously stored first scalable video A terminal device for transmitting to the outside; And Searching the corresponding content requested based on the request query, and transmitting the second scalable video corresponding to the remaining scalable video excluding the first scalable video from the retrieved content to the terminal device And a content providing server which provides the content providing server with the content providing server. The method according to claim 1, The scalable video comprises: And SVC video encoded according to a Scalable Video Coding (SVC) scheme. A terminal apparatus for processing scalable video, A video storage unit for storing the first scalable video; A video processing unit for processing the first scalable video and the second scalable video stored in the video storage unit and outputting the third scalable video when the second scalable video is received from an external content providing server; And to request the second scalable video that is further requested based on the first scalable video when it is desired to reproduce the third scalable video having higher scalability than the previously stored first scalable video, A video controller for outputting content information; And And a request unit for generating a request query for requesting the second scalable video based on the requested content information and transmitting the generated request query to the content providing server. The method of claim 3, The request unit, A request query generator for generating the request query requesting the second scalable video based on the requested content information output from the video controller; And a request query transmitter for transmitting the request query generated by the request query generator to the content providing server through an external network. The method according to claim 3 or 4, The request query includes: And at least one of the content name information corresponding to the first scalable video, the content codec information, the encoding variable information, the scalability information and the scalability information of the third scalable video to be reproduced . 6. The method of claim 5, The scalable video comprises: And a video encoded according to an SVC (Scalable Video Coding) scheme. The method according to claim 6, The video processing unit includes: (NAL) units of the second SVC video and the NAL units of the first SVC video that are streamed from the content providing server, based on the time stamp And outputting the third SVC video by sorting. The method of claim 3, Further comprising a video receiving unit for receiving the scalable video streamed from the external content providing server and outputting NAL (Network Abstraction Layer) units included in the packet of the scalable video to the video processing unit Terminal device. A content providing server for providing scalable video, A query receiver for receiving a predetermined request query from an arbitrary terminal apparatus via an external network; A query analyzer for searching for the requested content based on the request query when the request query is input from the query receiver; A video extracting unit for extracting a second scalable video corresponding to the remaining scalable video from which the first scalable video stored in the terminal device is excluded from the retrieved content based on the request query; And And a video transmission unit for transmitting the second scalable video over the network to the terminal device. 10. The method of claim 9, Wherein the request query received from the terminal device comprises: The content name information, the content codec information, the encoding variable information, the scalability information, and the scalability video scalability information of the third scalable video corresponding to the requested content, the content name information corresponding to the first scalable video pre- Wherein the content providing server comprises: 11. The method of claim 10, The query analyzing unit, And a third scalable video decoding unit operable to extract, based on at least one of the content name information, the content codec information, the encoding variable information, and the required scalability video scalability information included in the request query, Searching for the third scalable video, and outputting information included in the request query to the video extracting unit. 11. The method of claim 10, The video extracting unit extracts, Wherein the scalability information of the first scalable video is added from the retrieved third scalable video on the basis of the scalability information of the first scalable video among the information included in the request query inputted from the query analyzing unit Extracts the second scalable video corresponding to the remaining scalable video and outputs the second scalable video corresponding to the remaining scalable video. 13. The method according to any one of claims 9 to 12, The scalable video comprises: And SVC video encoded according to a Scalable Video Coding (SVC) scheme. 14. The method of claim 13, Further comprising a contents DB for storing contents corresponding to at least one scalable video having different scalability and providing the contents retrieved by the query analyzing unit to the video extracting unit. 15. The method of claim 14, Wherein the content stored in the content DB includes: Wherein the content providing server includes metadata including at least one of content codec information, encoding variable information, and scalability information. A method for providing scalable video, When the terminal device attempts to reproduce the third scalable video having higher scalability than the previously stored first scalable video, the terminal device transmits a request query requesting the second scalable video, which is further requested based on the first scalable video, To an external content providing server; When the request query is received, searching the corresponding content requested by the content providing server based on the request query; And And extracting the second scalable video corresponding to the scalable video excluding the first scalable video from the content searched by the content providing server and providing the extracted second scalable video to the terminal device. Delivery method. 17. The method of claim 16, The scalable video comprises: And SVC video encoded according to a Scalable Video Coding (SVC) scheme. A method of controlling a terminal apparatus, A second request for requesting the second scalable video that is further requested based on the first scalable video when the third scalable video having higher scalability than the previously stored first scalable video is to be reproduced, To an external content providing server; And And processing the first scalable video and the second scalable video and outputting the third scalable video when the second scalable video is received from the content providing server. / RTI > 19. The method of claim 18, Wherein the transmitting the request query comprises: Outputting requested content information for requesting the second scalable video which is further requested based on the first scalable video, Generating the request query requesting the second scalable video based on the requested content information; And transmitting the generated request query to the content providing server through an external network. 19. The method of claim 18, The request query includes: And at least one of the content name information corresponding to the first scalable video, the content codec information, the encoding variable information, the scalability information and the scalability information of the third scalable video to be reproduced And a control unit for controlling the terminal device. A method of controlling a content providing server, When a predetermined request query is received from an arbitrary terminal apparatus through an external network, searching for a corresponding content requested based on the request query; Extracting a second scalable video corresponding to the remaining scalable video excluding the first scalable video stored in the terminal from the retrieved content based on the request query; And And transmitting the extracted second scalable video to the terminal device via the network. 22. The method of claim 21, Wherein the request query received from the terminal device comprises: The content name information, the content codec information, the encoding variable information, the scalability information, and the scalability video scalability information of the third scalable video corresponding to the requested content, the content name information corresponding to the first scalable video pre- Wherein the content providing server includes at least one of the following: 22. The method of claim 21, Wherein the searching comprises: And a third scalable video decoding unit operable to extract, based on at least one of the content name information, the content codec information, the encoding variable information, and the required scalability video scalability information included in the request query, And searching for the third scalable video. 23. The method of claim 22, Wherein the extracting comprises: Removing a Network Abstraction Layer (NAL) unit according to the scalability information of the first scalable video from the retrieved third scalable video based on the scalability information of the first scalable video included in the request query; And extracting the second scalable video corresponding to the remaining scalable video. 25. The method according to any one of claims 21 to 24, The content may include: Wherein the metadata includes at least one of content codec information, encoding variable information, and scalability information of the content providing server.

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