KR20160147322A - Method and appratus for controlling media contents delivery - Google Patents

Abstract

An objective of the present invention is to resolve a traffic problem caused by an increase in demand for media content in a communication network. Specifically, the present invention provides a method, an apparatus, and a system for controlling media content transmission, which can adjust a frame rate of media content transmitted to a terminal from a media content providing server in a communication network. Media content is transmitted according to an MMT standard, wherein a media fragment unit (MFU) is constructed for each frame, frame compression type information is inserted into a header of the MFU to parse an MMT packet of the media content in the communication network and selectively remove an MFU of a frame unit by referring to the frame compression type information, and thereby traffic in the communication network can be adjusted.

Description

METHOD AND CONTROLLING MEDIA CONTENTS DELIVERY METHOD AND APPARATUS FOR CONTROLLING MEDIA CONTENT DELIVERY

The present invention relates to media content transmission, and more particularly, to a media content transmission control method and apparatus for controlling a frame rate of media content transmitted from a media content providing server to a terminal through a communication network.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

A transport stream (TS) is a communication protocol for transmitting multimedia related data including audio, video, and data through a network. The transport stream is a terrestrial / satellite digital broadcast, a digital multimedia broadcasting (DMB) , IPTV (Internet Protocol TV), and the like, and is recently used for media storage in digital video cameras and Blu-ray devices.

However, as the broadcasting network and the communication network gradually converge and become more advanced, new generation contents such as UHD (Ultra High Definition) image contents and 3D image contents are emerging, and new services such as N-screen service are emerging, .

As a first part of MPEG-H (High Efficiency Coding and Media Delivery in Heterogeneous Environments) standard for providing various services such as digital broadcasting in various kinds of broadband communication networks, MPEG media transmission (MMT: MEPG Media Transport) .

The MMT technology aims at providing efficient multimedia data transmission and various playback functions in various network environments that are being developed. The MMT technology includes an MPU (Media Processing Unit) function area, a signaling function area, a transfer function area, And a presentation information area.

Meanwhile, as demand for various media services has recently increased, there has been a problem that traffic is overloaded due to an increase in high-definition media contents service and an increase in demand due to an event such as a sports event. In order to solve such a traffic overload problem, It is necessary to appropriately control the data transmission amount of the media contents according to the situation.

However, the current media content transmission technology is to keep contents having various image qualities in a server aiming at seamless content transmission, and to transmit appropriate quality content data according to a content situation, And there is no way for a third party, for example, a network operator, to control the amount of media content to be transmitted according to traffic conditions on the network.

In particular, although the MMT technology aims at providing efficient multimedia data transmission and playback methods of various methods, a technology for controlling the transmission amount of media contents according to the traffic situation has not yet been proposed from the viewpoint of the network operator.

Korean Patent Laid-Open Publication No. 2014-0125274, October 28, 2014 (name: Dynamic Queue Management Method and Apparatus in Broadcasting System)

The present invention relates to a media content transmission control method capable of controlling a frame rate of media content transmitted from a media content providing server to a terminal on a communication network, , And a device for this purpose.

In particular, according to the present invention, media contents are transmitted according to the MMT standard, the MFU is configured for each frame, and the frame compression type information is inserted in the header of the MFU (Media Fragment Unit) The present invention is to provide a media content transmission control method and an apparatus therefor, which enable traffic control in a communication network by selectively removing MFUs on a frame-by-frame basis with reference to frame compression type information.

As a means for solving the above-mentioned problems, the present invention provides a media content processing apparatus, comprising: receiving an MMT packet transmitted from a media content providing server to a terminal through a communication network; Analyzing the MMT packet to extract an MFU; Extracting frame compression type information of the corresponding MFU from the header of the MFU; Selecting data units of specific frame compression type information among MFUs included in the MMT packet at a ratio according to a predetermined frame rate; And removing the selected MFU and transmitting an MMT packet including an un-selected MFU to the terminal.

The method of controlling media content transmission according to an embodiment of the present invention may further include analyzing a header of the MMT packet and checking whether the MMT packet is an object of frame rate adjustment before extracting the MFU,

The step of extracting the MFU may be performed on the MMT packet confirmed as the frame rate adjustment object.

In addition, the method of controlling media content transmission according to an exemplary embodiment of the present invention may further include, as a result of checking, transmitting an MMT packet not subject to a frame rate adjustment to the terminal.

In the method of controlling media content transmission according to an exemplary embodiment of the present invention, the step of checking whether the frame rate is an object of adjustment includes analyzing an MMT header of the MMT packet and confirming a priority according to a packet type; And determining whether the data type stored in the payload of the MMT packet is an MPU by analyzing the MMT payload header of the MMT packet, ; If the data type is an MPU, determining that the frame rate is to be adjusted.

In the method of controlling media content transmission according to an exemplary embodiment of the present invention, the step of receiving the MMT packet may include transmitting a MMT packet among the packets transmitted to the base station through the switching device connected between the specific base station and the core network, And redirecting the content to the content processing apparatus.

In addition, the method of controlling media content transmission according to an exemplary embodiment of the present invention may further include setting the frame rate according to a traffic amount transmitted through a specific base station.

In the above-described process, the MFU included in the MMT packet is configured on a frame-by-frame basis, and the specific frame compression type information may be one of P type and B type types defined in the MPEG standard.

The media content transmission control method of the present invention described above can be executed through a processor after the program is embodied on a computer readable recording medium.

According to another aspect of the present invention, there is provided an information processing apparatus comprising: an input / output interface module for inputting an MMT packet transmitted from a media content providing server to a terminal and outputting the MMT packet to the communication network; An analysis module for analyzing the MMT packet to extract an MFU (Media Fragment Unit) and extracting frame compression type information of the MFU from the header of the MFU; And a data unit of specific frame compression type information among the MFUs included in the MMT packet is selected at a rate according to a predetermined frame rate, the selected MFU is removed, and the MMT packet including the MFU not selected is transmitted to the input / And a control module for outputting the media content to the communication network through the network.

In the apparatus for processing media contents according to an embodiment of the present invention, the analysis module analyzes the header of the MMT packet, extracts priority information according to the packet type of the MMT packet, or extracts the MMT payload header The control module further determines whether the MMT packet is an object of frame rate adjustment based on at least one of the priority and the data type, If the rate is not to be adjusted, the MMT packet can be directly output to the communication network through the input / output interface module.

Further, in the media content processing apparatus according to the embodiment of the present invention, the control module can set the frame rate in accordance with the traffic amount of the communication network.

In addition, the present invention solves the above-mentioned problems by extracting an MFU by analyzing an MMT packet transmitted from a media content providing server to a terminal through a communication network, checking frame compression type information of the MFU from the header of the MFU A media content processing apparatus for selectively removing MFUs of specific frame compression type information among MFUs included in the MMT packet at a rate according to a predetermined frame rate; And a switching device connected between the specific base station and the core network and redirecting the MMT packet to the media content processing apparatus among the packets transmitted through the base station.

The media content transmission control system according to the present invention may further comprise a monitoring device for monitoring a traffic amount transmitted through the base station, and the media content processing device may set the frame rate according to the traffic amount.

The present invention relates to a method for controlling a frame rate of media content transmitted through a communication network on the communication network, the method comprising transmitting the media content according to an MMT standard, forming an MFU (Media Fragment Unit) of an MMT packet for each frame, The MMT packet of the media content is parsed on the communication network and the MFU of each frame is selected and removed by referring to the frame compression type information so as to enable traffic control on the communication network have.

In addition, the present invention can adjust the frame rate of the media content through the analysis of the MMT packet on the communication network, thereby adjusting the frame rate of the media content according to the traffic amount of the communication network, thereby solving the traffic overload problem.

1 is a block diagram schematically illustrating a configuration of a media content transmission control system according to an embodiment of the present invention.
2 is a diagram illustrating a process of controlling media content transmission in a media content transmission control system according to an embodiment of the present invention.
3 is a block diagram illustrating a main configuration of a media content processing apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a media content transmission control method of a media content processing apparatus according to an embodiment of the present invention.
5 is a diagram showing a structure of an MMT packet.
6 is a diagram showing a detailed structure of an MMT payload header of an MMT packet.
FIG. 7 is a diagram illustrating a process of adjusting a frame rate in a media content transmission control system according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating a media content whose frame rate is adjusted according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor is not limited to the concept of terminology for describing his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various elements, and are used only for the purpose of distinguishing one element from another, Not used. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising "or" having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

In addition, embodiments within the scope of the present invention include computer readable media having or carrying computer executable instructions or data structures stored in computer readable media. Such computer-readable media can be any available media that is accessible by a general purpose or special purpose computer system. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or in the form of computer- But is not limited to, a physical storage medium such as any other medium that can be used to store or communicate certain program code means of the general purpose or special purpose computer system, .

In addition, in the present invention, the media content is defined as a set of content components, for example, a movie, a song, and the like. The content component (also referred to as a media component) is defined as a media of a single type or a subset of media of a single type, For example, it may be a video track, movie subtitles, or enhancement layer of video.

In the present invention, such media contents can be configured and transmitted according to the MMT (MPEG Media Transport) standard. For reference, the MMT protocol (MMT protocol) defines an application layer protocol for delivering a delivery frame composed of an MMT payload format (PF) over an IP network. The MMT payload is designed in a MMT payload format for efficient delivery. In order to efficiently deliver MPEG media data through heterogeneous IP networks, the MMT defines Encapsulation Formats, Delivery Protocols, and signaling message formats.

1 is a block diagram schematically illustrating a configuration of a media content transmission control system according to an embodiment of the present invention.

Referring to FIG. 1, a media content transmission control system 100 according to an exemplary embodiment of the present invention is provided on a communication network to which a plurality of terminals 10 and a media content providing server 50 are connected, And is configured to adjust a frame rate of the media content by analyzing a data packet of media content transmitted from the media content providing server 50 to the terminal 10, in particular, an MMT packet.

In the present invention, the communication network is defined as one or more data links for transmitting electronic data between computer systems and / or modules, and may be a combination of one or more different communication networks, for example, 3G mobile communication network, 4G mobile communication network, WLAN (Wireless LAN), Wi-Fi, WiBro, WiMAX, High Speed Downlink Packet Access (HSDPA), Ethernet, xDSL (ADSL, VDSL ), HFC (Hybrid Fiber Coaxial Cable), FTTC (Fiber to the Curb), FTTH (Fiber To The Home), and the like.

In the case of a mobile communication network, the communication network includes an access network 20 to which a plurality of terminals 10 are connected, a connection network 20 for connecting the plurality of access networks 20 and an external network (for example, And a core network 30 for performing the above operation.

The access network 20 is a network for performing wireless communication with the terminal 10 and includes a plurality of base stations 21 such as a base station (BS), a base transceiver station (BTS), a NodeB, an eNodeB And may further include a base station controller such as a base station controller (BSC) and a radio network controller (RNC). At this time, the plurality of base stations 21 divides the digital signal processing unit and the radio signal processing unit of each base station into digital units (hereinafter referred to as DUs and radio units (hereinafter referred to as RUs) A plurality of RUs may be installed in each area, and a plurality of RUs may be connected to a centralized DU.

 The core network 30 serves to connect an access network to an external network, for example, the Internet. The core network 30 performs circuit switching or packet switching, Management and control. The core network (not shown) manages inter-frequency mobility and plays a role for interworking with traffic in an access network (not shown) and a core network (not shown) and other networks such as the Internet It is possible. Such a core network (not shown) may further include an SGW (Serving Gate Way), a PGW (PDN GateWay), an MSC (Mobile Switching Center), a HLR (Home Location Register), a MME (Mobile Mobility Entity) .

The media transmission control system 100 according to the present invention is provided between the access network 20 and in particular the base station 21 and the core network 30 and is connected to the media content providing server 50 through the communication network, 10), and the frame rate of the media content is adjusted by selecting a frame of a specific frame compression type at a rate according to a predetermined frame rate in the media content, A switching device 110, a monitoring device 120, and a media content processing device 130. The switching device 110 is connected to the switching device 110, Here, the monitoring device 120 does not necessarily have to be included, but can be replaced with receiving a monitored traffic volume from an external device.

At this time, the terminal 10 can transmit and receive information to and from the live streaming providing server 70 via the communication network, that is, the access network 20, the core network 50, and the Internet network 60, . The terminal 10 can perform voice or data communication through the access network 20, the core network 50, and the Internet network 60. To this end, the terminal 10 of the present invention may include a browser for transmitting and receiving information, a memory for storing a program and a protocol, and a microprocessor for executing and controlling various programs. In particular, the terminal 10 according to the embodiment of the present invention refers to the terminal 10 capable of receiving and processing the MMT packet transmitted from the media content providing server 50.

The terminal 10 according to the embodiment of the present invention can be implemented in various forms. For example, the terminal 10 described herein may be a mobile terminal such as a smart phone, a tablet PC, a PDA (personal digital assistant), a portable multimedia player (PMP) , A smart TV, a desktop computer, etc. may be used.

The media content providing server 50 stores the media content and transmits the media content in the form of an MMT packet according to a request of the terminal 10. [ In particular, in the present invention, the media content providing server 50 configures an MFU in frame units in an MMT packet, and records frame compression type information of frame data recorded in each MFU in the MFU header, have.

The MMT payload includes at least one Media Fragment Unit (MFU), at least one Media Processing Unit (MPU), and at least one Media Processing Unit ), At least one Asset, and an MMT package (Package). For example, for streaming transmission, the data unit of the MMT payload may be an MFU or an MPU, and, for file delivery, the data unit may be an MMT asset and an MMT package. In the present invention, the media content may be transmitted in a streaming manner. Accordingly, the MMT payload of the MMT packet of the media content may be composed of at least one MPU or at least one MFU.

Here, the MFU is a container format that is independent of any specific media codec and includes media data that is independently coded to be processable by a media decoder. The MFU is a part of the fragmented data of the MPU, and the minimum unit that can be independently decoded is do. In the present invention, the MFU is composed of one video frame.

An MPU is a container format containing one or more MFUs and additional delivery and processing related information, and may include various numbers of MFUs generated from a plurality of different access units. The MPU means an encoded media data unit that can be completely and independently processed by an MMT compliant entity. The MPU is a specific size (for example, one GOP (Grou of Picture).

An MMT asset is a data entity composed of one or more MPUs and is the largest data unit to which the same composition information and transport characteristics are applied. An MMT asset contains only one type of data (such as audio or video) that is packaged or multiplexed.

An MMT package is defined as a collection of encoded video data and related information processed by the MMT implementation entity. That is, one media content may be composed of one MMT package.

In the media content transmission control system 100 according to the present invention, the switching device 100 is configured as described above, and controls the switching of the media content transmitted from the media content providing server 50 with the terminal 10 as a destination. And redirects the MMT packet to the media content processing apparatus 130. At this time, the switching device 100 performs the redirection based on the address information (source address, destination address, etc.) recorded in the IP header of the MMT packet or performs the redirection based on the packet type information or the port information included in the IP header The redirect can be performed. Particularly, the switching device 100 is provided between the specific access network 20 (or the base station 21) and the core network 30, and transmits the packet to the specific access network 20 (or the base station 21) The MMT packet may be redirected to the media content processing apparatus 130.

The switching device 100 may mirror the packet transmitted to the specific access network 20 (or the base station 21) and may transmit the packet to the monitoring device 200. The monitoring device 200 may refer to the mirrored packet And monitors the traffic volume of the specific access network 20 (or the base station 21). The monitoring apparatus 200 provides the monitored traffic volume to the media content processing apparatus 130 in real time.

The apparatus for processing media content 130 receives an MMT packet redirected by the switching device 110 and analyzes the header of the MMT packet, Determining whether the MMT packet is an object of frame rate adjustment, checking the frame compression type information of each MFU included in the MMT packet if the object is a frame rate adjustment, And outputs the MMT packet including the unmerged MFU to the communication network through the switching device 110 again. The MMT packet is transmitted to the terminal 10, which is the original destination, through the access network 20.

Hereinafter, a process of controlling media content transmission by the media content transmission control system configured as described above will be described with reference to FIG.

2 is a diagram illustrating a process of controlling media content transmission in a media content transmission control system according to an embodiment of the present invention.

2, the media content processing apparatus 130 sets the frame rate of the media content according to the traffic amount of the specific base station 21 (S105). At this time, the traffic volume of the specific base station 21 can be received from the monitoring apparatus 120.

In this state, the arbitrary terminal 10 may request the media content providing server 50 to stream specific media content (S110). At this time, the streaming request of the specific media content is transmitted to the media content providing server 50 through the base station 21, the core network 30, and the Internet network 40 of the access network 20 to which the terminal 10 is connected .

Then, the media content providing server 50 constructs an MMT packet for streaming transmission of the requested media content (S115), and transmits the MMT packet to the communication network (S120).

At this time, the destination of the MMT packet is the terminal 10 requesting the media content, and the MMT packet is transmitted to the terminal 10 through the Internet network 40, the core network 30 and the access network 20, The switching device 110 connected between the base station 21 and the core network 30 redirects the MMT packet to the media content processing apparatus 130 that is not the original destination in operation S125.

The media content processing apparatus 130 that receives the MMT packet transmitted from the media content providing server 50 to the terminal 10 on the communication network analyzes the header of the received MMT packet, (S 130), and selects MFUs of a specific frame compression type at a ratio according to the predetermined frame rate (S 135). The selected MFU is removed (S140). Then, the MMT packet including the MFU that has not been removed is transmitted to the terminal 10, which is the original destination, through the switching device 110 (S145).

 The frame rate of the media content streamed from the media content providing server 50 is adjusted by the operation as described above so that the traffic amount of the communication network, particularly the specific base station 21 can be adjusted to solve the traffic overload do.

In the above-described process, the configuration and operation of the media content processing apparatus 130 will be described in more detail.

3 is a block diagram illustrating a main configuration of a media content processing apparatus according to an embodiment of the present invention.

3, the apparatus 130 for processing media contents according to the present invention may include an input / output interface module 131, an analysis module 132, and a control module 133.

The input / output interface module 131 receives the MMT packet transmitted from the media content providing server 50 to the AT 10 from the communication network and outputs the MMT packet to the communication network again. The input / output interface module 131 receives the MMT packet redirected by the switching device 110 connected between the base station 21 and the core network 30 and outputs the MMT packet to the switching device 110 again And is transmitted to the terminal 10, which is the original destination, through the switching device 110.

The analysis module 132 analyzes the header of the MMT packet input through the input / output interface module 131. Here, the header of the MMT packet may include at least one of an MMT header, an MMT payload header, and an MFU header. The analysis module 132 analyzes each header to determine a frame rate adjustment target, ) Is extracted. Specifically, the analysis module 132 extracts at least one of a priority of a packet, a data type contained in a packet, and a frame compression type information.

The control module 133 determines an MFU to be removed for the object of frame rate adjustment and frame rate adjustment based on the information extracted from the analysis module 132 and determines the MFU of the MMT packet according to the frame rate And transmits the MMT packets including the MFUs not removed to the communication network through the input / output interface module 131 again. At this time, the control module 133 can receive the traffic volume of the base station 21 measured from the monitoring device 120, and set the frame rate according to the traffic volume. Specifically, the frame rate is set to be inversely proportional to the amount of traffic.

The operation of the media content processing apparatus 130 configured as described above will be described with reference to the flowchart of FIG.

4, a media content processing apparatus 130 according to the present invention includes a base station 21, and more particularly, a base station 21 connected to a switching device 110 interlocked with the media content processing apparatus 130 The traffic amount is confirmed and the frame rate of the media content is set so as to be inversely proportional to the traffic amount (S205). At this time, the frame rate can be set to the frame compression type information to be removed per 1 GOP and the number.

Thereafter, the media content processing apparatus 130 receives the MMT packet destined for the terminal 10 from the redirected media content providing server 50 through the switching device 110 (S210). The MMT packet consists of an MMT packet header and an MMT payload. The MMT payload is again composed of an MMT payload header and payload data, and the payload data includes one or more MFUs. Each of the one or more MFUs includes an MFU header.

Accordingly, the media content processing apparatus 130 analyzes the MMT packet to determine whether the MMT packet is an object of frame rate adjustment, and selects an MFU to be removed if the object is a frame rate adjustment object.

To this end, the media content processing apparatus 130 may analyze the MMT header to determine whether the MMT packet is an object of frame rate adjustment.

As shown in FIG. 5, the MMT header includes a packet ID (packet_id), a packet sequence number (packet_sequence_number), a time stamp (timestamp), a Type of Packet (TP) , A flow label (Flow_label), and the like. Herein, TP is information for defining a packet type. In the present invention, the TP stores priority information set in a packet. The priority order may be arbitrarily set for each type of media content. The priority order may be such that a high priority is given to the media content of which image quality is important, a low priority order is given to the media content not greatly affected by image quality, It is possible to give a low priority to a media content with a low priority to a high priority.

Accordingly, the media content processing apparatus 130 analyzes the MMT header to extract the priority of the corresponding MMT packet from the TP information (S215), compares the extracted priority with a threshold value A for determining a frame rate adjustment object It is checked whether the frame rate is an object of adjustment (S220). Here, the threshold value A may be set to any value among the priority levels recorded in the TP. For example, when a priority of 0 to 7 is defined in TP, the threshold value A is set to 5. If the priority is greater than the threshold value 5, it is determined that the frame rate is not to be adjusted, If the value is less than 5, it can be judged that the frame rate is to be adjusted.

In addition, the media content processing apparatus 130 may analyze the MMT payload header to determine whether the MMT packet is a frame rate adjustment target. For reference, the MMT payload header is header information recorded in the payload field of the MMT packet. The MMT payload has a length of payload data, Information related to the recorded data type, fragmentation and aggregation, and the like. Here, the data type may include an MPU and a signaling message. As described above, the MPU means media data composed of one or more MFUs. When the data type is an MPU, the frame rate is to be adjusted. However, the signaling message is not subject to frame rate adjustment.

Accordingly, the media content processing apparatus 130 according to the present invention analyzes the MMT payload header to extract data type information of the payload data (S225), and determines whether the corresponding MMT packet is a frame rate adjustment object (S230). If the data type of the payload data is an MPU, the MMT packet is determined to be a frame rate adjustment target, and if the data type is a signaling message, it is determined that the MMT packet is not a frame rate adjustment target.

If it is determined that the MMT packet is to be subjected to the frame rate adjustment, the media content processing apparatus 130 analyzes the header of each MFU included in the payload of the MMT packet to extract frame compression type information ( S235).

Then, the MFU to be removed is selected at a predetermined ratio according to the preset frame rate (S240). For reference, the media content according to the present invention constitutes an MFU on a frame-by-frame basis. In the media content, each frame is compressed into one of I type, B type and P type. For reference, an I-type frame is an intraframe, which can be compressed or restored regardless of other frames, and has the lowest compression ratio among I, P, and B. The P type frame refers to a Predicted frame. The P type frame is a frame obtained by coding only a difference value by comparing only a difference portion with a previous frame. The B type frame can be compressed by referring to the next frame as well as being calculated from the previous frame in bi-directional frame. For example, a B type frame has a difference value between an I or P type frame and an I or P frame after the B frame. For reference, a set of consecutive pictures starting with an I frame is called a GOP (Group Of Picture).

In the present invention, the media content processing apparatus 130 arbitrarily selects and removes B-type and P-type frames except for I-type frames, which are necessary for encoding, to adjust the frame rate without deteriorating a large image quality.

Accordingly, in step S240, the media content processing apparatus 130 can select MFUs to be removed at a certain rate according to the frame rate, among the B type and P type MFUs.

Then, the media content processing apparatus 130 removes the selected MFU (S245), transfers the MMT packet including the MFU not removed to the communication network again through the switching device 110, (S250).

FIG. 7 is a diagram illustrating a process of adjusting a frame rate of media content by a media content transmission control system according to an embodiment of the present invention. For reference, in the example of FIG. 7, it is assumed that the MPU recorded in the payload data of the MMT packet is composed of a plurality of MFUs constituting one GOP, constituted of media data of 1 GOP unit. It is also assumed that 1GOP has an MPEG-2 sequence of I-P-B-P.

Referring to FIG. 7, the streaming providing server 50 packetizes requested media contents into MMT packets P1, P2, P3, P4,.. At this time, each of the MMT packets P1, P2, P3, P4, ... includes four MFUs each consisting of I-P-B-P type frame data.

The frame rate of the MMT packet is adjusted by the media content processing apparatus 130 according to the traffic amount of the base station 21. When the traffic amount of the base station 21 is equal to or less than the threshold value, 130 delivers the corresponding MMT packet directly to the base station 21 and the base station 21 transmits the MMT packet to the terminal 10 at the frame rate transmitted from the media content providing server 50.

On the other hand, when the traffic amount of the base station 21 is equal to or less than the threshold value, the media content processing apparatus 130 can selectively remove one of the P type MFUs out of the MFUs of the MMT packets.

At this time, the MMT packet transmitted to the terminal 10 through the base station 21 includes three MFUs of I-B-P three frame compression types. Accordingly, the frame rate of the MMT packet transmitted to the terminal 10 is reduced, and accordingly, the amount of traffic to be transmitted by the base station 21 can be reduced.

FIG. 8 is a graph showing the frame rate adjustment state of media contents on the time axis according to the embodiments of the present invention.

8A is an MPEG-2 sequence of the media content transmitted from the media content providing server 50, and FIGS. 8B and 8C are diagrams showing a frame rate determined according to the traffic amount in the media content processing apparatus 130 Thus, the MPEG-2 sequence of the media content in which frames are selectively removed based on the frame compression type is shown.

In this state, when the traffic amount of the base station 21 is less than the traffic amount set as the congestion state, the media content processing apparatus 130 can directly transmit the received MMT packet to the terminal 10 without adjusting the frame rate of the received MMT packet. In this case, the frame sequence of the MMT packet transmitted to the terminal 10 is the same as that of FIG. 8 (a).

On the other hand, when the traffic amount of the base station 21 is larger than the first threshold value, the media content processing apparatus 130 can selectively remove B frames from the received MMT packets. The frame sequence of the MMT packet transmitted to the terminal 10 through the base station 21 includes a 1-BP frame as shown in FIG. 8 (b) The frame rate is reduced as compared with the transmission time in the frame. In addition, since the data transmission amount is proportional to the frame rate, the traffic amount of the base station 21 can be reduced in accordance with the decrease of the frame rate.

In addition, if the traffic volume of the base station 21 is greater than the second threshold (greater than the first threshold), the media content processing apparatus 130 may remove one P frame with the B frame of the MMT packets . The MMT packet transmitted to the terminal 10 through the base station 21 is composed of an IP frame as shown in FIG. 8 (c), and the frame rate is further reduced as compared with the example of FIG. 8 (b) And the traffic volume of the base station 21 can be further reduced.

The media content transmission control method of the present invention as described above may be provided in the form of a computer-readable medium suitable for storing computer program instructions and data. At this time, the program recorded on the recording medium can be read and installed in the computer and executed, thereby executing the above-described functions.

In order to allow a computer to read a program recorded on a recording medium and to execute functions implemented by the program, the above-mentioned program may be stored in a computer-readable medium such as C, C ++, JAVA, machine language, and the like.

The code may include a function code related to a function or the like that defines the functions described above and may include an execution procedure related control code necessary for the processor of the computer to execute the functions described above according to a predetermined procedure. In addition, such code may further include memory reference related code as to what additional information or media needed to cause the processor of the computer to execute the aforementioned functions should be referenced at any location (address) of the internal or external memory of the computer . In addition, when a processor of a computer needs to communicate with any other computer or server that is remote to execute the above-described functions, the code may be stored in a memory of the computer using a communication module of the computer, It may further include a communication-related code such as how to communicate with another computer or a server, and what information or media should be transmitted or received during communication.

Such computer-readable media suitable for storing computer program instructions and data include, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits.

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. The functional program for implementing the present invention and the related code and code segment may be implemented by programmers in the technical field of the present invention in consideration of the system environment of the computer that reads the recording medium and executes the program, Or may be easily modified or modified by the user.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

The present invention relates to a method for controlling a frame rate of media content transmitted through a communication network on the communication network, the method comprising transmitting the media content according to an MMT standard, forming an MFU (Media Fragment Unit) of an MMT packet for each frame, The MMT packet of the media content is parsed on the communication network and the MFU of each frame is selected and removed by referring to the frame compression type information so as to enable traffic control on the communication network have.

In addition, the present invention can adjust the frame rate of the media content through the analysis of the MMT packet on the communication network, thereby adjusting the frame rate of the media content according to the traffic amount of the communication network, thereby solving the traffic overload problem.

10: terminal 20: access network
21: base station 30: core network
40: Internet network 50: Media content providing server
100: Media content transmission control system
110: switching device 120: monitoring device
130: Media content processing device

Claims (14)

Receiving an MPEG Media Transport (MMT) packet transmitted from a media content providing server to a terminal through a communication network;
Analyzing the MMT packet to extract an MFU (Media Fragment Unit);
Extracting frame compression type information of the corresponding MFU from the header of the MFU;
Selecting data units of specific frame compression type information among MFUs included in the MMT packet at a ratio according to a predetermined frame rate; And
And removing the selected MFU and transmitting an MMT packet including an un-selected MFU to the terminal. 2. The method of claim 1, wherein prior to extracting the MFU,
Further comprising analyzing a header of the MMT packet to determine whether the MMT packet is an object of frame rate adjustment,
Wherein the step of extracting the MFU is performed on an MMT packet confirmed as a frame rate adjustment object. 3. The method of claim 2,
And transmitting the MMT packet not the object of frame rate adjustment to the terminal as it is. The method of claim 2, wherein the step of verifying whether the frame rate is an object of adjustment
Analyzing an MMT header of the MMT packet and confirming a priority according to a packet type; And
And determining whether the frame rate is an object of adjustment according to the priority order. The method of claim 2, wherein the step of verifying whether the frame rate is an object of adjustment
Analyzing the MMT payload header of the MMT packet to determine whether the data type loaded on the payload of the MMT packet is an MPU;
If the data type is an MPU, determining that the frame rate is to be adjusted. The method of claim 1, wherein receiving the MPEG Media Transport (MMT)
And redirecting an MMT packet among the packets transmitted to the base station through the switching device connected between the specific base station and the core network, to the media content processing apparatus. The method according to claim 6,
Further comprising the step of setting the frame rate according to a traffic amount transmitted through the specific base station. The method according to claim 1,
Wherein the MFU is configured on a frame-by-frame basis. The method according to claim 1,
Wherein the specific frame compression type information is one of a P type and a B type defined in the MPEG standard. A computer-readable recording medium having recorded thereon a program for executing the media content transfer control method according to any one of claims 1 to 9. A computer program which is implemented to execute the media content transfer control method according to any one of claims 1 to 9 and recorded on a computer-readable recording medium. An input / output interface module for inputting an MMT packet transmitted from a media content providing server to a terminal and outputting the MMT packet to the communication network;
An analysis module for analyzing the MMT packet to extract an MFU (Media Fragment Unit) and extracting frame compression type information of the MFU from the header of the MFU; And
The data unit of the specific frame compression type information among the MFUs included in the MMT packet is selected at a ratio according to a predetermined frame rate, the selected MFU is removed, and the MMT packet including the non-selected MFU is transmitted through the input / And outputting the result to the communication network. 13. The method of claim 12,
The analysis module analyzes the header of the MMT packet, extracts priority information according to the packet type of the MMT packet, analyzes the MMT payload header of the MMT packet, and analyzes the data type stored in the payload of the MMT packet Further,
Wherein the control module determines whether the MMT packet is an object of frame rate adjustment based on at least one of the priority and the data type and if the MMT packet is not an object of frame rate adjustment, And outputs it to a communication network. 13. The method of claim 12,
Wherein the control module sets the frame rate according to a traffic amount of the communication network.

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