KR101943214B1 - Method for Generating 8K Broadcasting Stream based on MMT and Broadcasting System applying the same - Google Patents

Abstract

An MPEG media transport (MMT)-based 8K broadcasting stream generating method and a broadcasting service system applying the same are provided. According to an embodiment of the present invention, an MMT-based broadcasting transmission system divides content into a plurality of regions, encodes each of the plurality of divided regions to a plurality of layers, capsulizes each of the plurality of encoded layers to a media processing unit (MPU), generates an MPU on a partial layer as an MPEG media transport protocol (MMTP) packet, and transmits the MMTP packet. Therefore, a bit rate shortage which can occur in providing an 8K broadcasting service can be solved.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of generating an 8K broadcast stream based on MMT and a broadcasting service system using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast service technology, and more particularly, to a method for generating an 8K broadcast stream to be transmitted through a heterogeneous network based on an MMT (MPEG Media Transport).

As digital broadcasts stabilize and display performance improves, users are demanding better quality and larger size video services.

UHDTV is a next-generation broadcast that can meet the needs of viewers by providing high-definition video and 22.2 multichannel audio for realistic content. In August 2016, NHK, the public broadcaster in Japan, launched the world's first regular UHDTV service through satellite, and competition among the countries is fierce to preempt UHDTV technology such as contents, transmission, display device, and set-top.

8K video, which is 16 times larger than 2K (1920x1080) and 4 times larger than 4K (3840x2160), is very large and requires high-efficiency video coding and transmission technology for UHDTV content.

8K content is compressed in HEVC (High Efficiency Video Coding) according to a frame rate of 60 fps, a color depth of 10 bits, and a sampling rate of 4: 2: 0 in Japan which started the world's only 8K test broadcast.

Through the bit rate according to the 4K standard shown in FIG. 1, it can be seen that a higher bit rate is required for the 8K service. Japan's 8K UHDTV is actually transmitted over satellites at a bit rate of 80-90Mbps.

In reality, it is impossible to transmit over 80 Mbps over terrestrial channels. Although it can be technically more than 40 Mbps using the transmission technology of ATSC 3.0 (Advanced Television Systems Committee) and DVB-T2 (Digital Video Broadcasting-Terrestrial), it is possible that a bit rate of 30 Mbps is actually a stable terrestrial broadcast service Lt; RTI ID = 0.0 > limited < / RTI >

Therefore, a new system for 8K broadcasting is required in the current terrestrial broadcasting environment. Especially, in Korea, terrestrial 8K trial broadcasting is under way, but the current terrestrial broadcast environment transmits real 8K (7680 * 4320, 4: 2: 0, 120fps, 10bit: color depth) There are various problems such as a lack of bandwidth.

Furthermore, the fact that codecs (encoders, decoders) for 8K video are not commercialized, and that they are very expensive even if they are commercialized, should be considered in 8K broadcasting.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to solve the shortage of bit rate that can occur when an 8K broadcast service is provided and divide 8K contents into 4K areas And to provide a method and system for delivering on an MMT basis through a heterogeneous network.

According to an aspect of the present invention, there is provided an MMT-based broadcast transmission system including: a content server for dividing a content into a plurality of regions and encoding each of the divided regions into a plurality of layers; A first generator for encapsulating each of the encoded layers with an MPU (Media Processing Unit) and generating an MPU for some layers as a first MMTP (MPEG Media Transport Protocol) packet; And a second generator for generating and transmitting a broadcast signal from the first MMTP packet generated by the first generator.

And, the divided regions may be generated as independent assets having a unique identifier.

The first generator further includes: a first component for generating an MPU; A second component for generating CI (Composition Information); A third component for generating a signal message with reference to the CI; And a fourth component for generating a first MMTP stream with an MPU and a signal message for some of the layers.

The CI may include group information including information of assets to be displayed together.

Also, the group information may include the set of assets constituting the same layer.

The third component may store the group information in the MP table of the MPI (Media Presentation Information) message, which is one of the signal messages.

In addition, the fourth component may include, in the header of the first MMTP packet, information indicating whether the data of the payload of the first MMTP packet is video data, information on the layer in the case of video data, ID can be recorded.

And, the fourth component may include a scheduler for scheduling the first MMTP packet according to the area information.

In addition, the scheduler can schedule the packets including the areas of the same layer in the order of the area numbers.

The fourth component may generate the second MMTP packet to the MPU for the remaining layer.

Also, the MMT-based broadcast transmission system according to the embodiment of the present invention may further include: a third generator for generating an MXD (Extension Document) to provide a second MMTP packet generated by the fourth component over HTTP; And a streaming server for streaming the second MMTP packet and the MXD to HTTP

The content is 8K video, and the divided areas are 4K video size

According to another aspect of the present invention, there is provided an MMT-based broadcast transmission method including: dividing a content into a plurality of regions and encoding each of the divided regions into a plurality of layers; Encapsulating each of the encoded layers with an MPU (Media Processing Unit), and generating an MPU for a certain layer as a first MMTP (MPEG Media Transport Protocol) packet; And generating and transmitting a broadcast signal from the first MMTP packet.

According to another aspect of the present invention, there is provided a broadcast receiving apparatus including: a receiver for receiving a broadcast signal from a broadcast transmission system and generating a content by decoding a received broadcast signal; And a display for displaying content generated by the receiver, wherein the broadcasting transmission system divides the content into a plurality of areas, encodes each of the divided areas into a plurality of layers, and transmits each of the encoded layers to the MPU (Media Processing Unit), generates MPUs for some layers as first MMTP (MPEG Media Transport Protocol) packets, and generates and transmits broadcast signals from the generated first MMTP packets.

According to another aspect of the present invention, there is provided a broadcast receiving method including: receiving a broadcast signal from a broadcast transmission system and decoding a received broadcast signal to generate a content; And displaying the content generated by the receiver, wherein the broadcasting transmission system divides the content into a plurality of areas, encodes each of the divided areas into a plurality of layers, and transmits each of the encoded layers to the MPU (Media Processing Unit), generates MPUs for some layers as first MMTP (MPEG Media Transport Protocol) packets, and generates and transmits broadcast signals from the generated first MMTP packets.

As described above, according to the embodiments of the present invention, since the 8K content is divided into four 4K areas and transmitted on the MMT basis via the heterogeneous network, it is possible to solve the shortage of the bit rate that can occur in providing 8K broadcast service have.

According to the embodiments of the present invention, it is possible to provide 8K broadcasting service even if there is no codec (encoder, decoder) for 8K video that is not commercialized or is very expensive even if it is commercialized.

In addition, according to embodiments of the present invention, information of regions constituting the same layer is provided as group information, and the receiving end can smoothly restore original contents by merging regions.

Furthermore, according to embodiments of the present invention, packets including data of the same layers in each area can be scheduled in order of area-number, thereby reducing delay in broadcasting service due to area division.

1 is a table comparing UHSTV standards between Korea and Japan,
2 is a block diagram illustrating the concept of SHVC encoding,
Figure 3 shows a method of encapsulating SHVC-encoded video,
Figure 4 illustrates an 8K broadcast service architecture over a heterogeneous network;
5 shows 8K content divided into four regions,
FIG. 6 is a diagram illustrating a UHDTV service scenario,
7 is a detailed block diagram of an MMT signal / MMTP generator,
8 is a diagram illustrating a relationship between a CI and an HTML5 document and a CI document generated by a CI component,
9 is a diagram illustrating an MP table,
10 is a diagram illustrating the syntax of the Group_descriptor ()
11 is a diagram showing a structure of a packet_id,
12 is a view showing details of information constituting the packet_id,
13 is a table showing a value of 'packet_id' and a description thereof,
14 is a diagram illustrating a method of scheduling MMTP packets according to area information.

Hereinafter, the present invention will be described in detail with reference to the drawings.

In an embodiment of the present invention, an 8K broadcasting system using a digital broadcasting network and a packet switching network is presented. The proposed system divides 8K contents into four 4K areas and delivers them through heterogeneous networks.

In addition, the embodiment of the present invention proposes a scheme for allowing four 4K divided areas transmitted through a heterogeneous network to be merged into one 8K content at the receiving end.

MMT (MPEG Media Transport) is the next generation technology for media delivery through digital broadcasting network and packet exchange network. It has three functional areas: MPU (Media Processing Unit) format, Signal Messages and Delivery Protocol .

The MPU format based on ISOBMFF (ISO based media file format) defines the logical structure of the media content and the format of the data unit for encapsulating the encoded data. A signal message defines a number of signaling messages for managing the delivery and use of media data. The delivery protocol defines the Application-Layer Transport Protocol and the payload format. The MMT supports streaming mode optimized for transmitting packetized ISOBMFF files and signaling messages to enable broadcast services.

The broadcast system according to the embodiment of the present invention is applicable to various devices such as a smart phone, a tablet PC, a laptop PC, a notebook computer, and a television.

In the embodiment of the present invention, each 4K region divided from 8K is encoded into SHVC of the concept shown in Fig. SHVC is the Scalability Extensions of HEVC, a video compression standard that supports resolutions up to 8K, which provides twice the data compression rate compared to AVC (Advanced Video Coding). This provides spatial, temporal and quality scalability.

The SHVC encoder creates several layers, specifically a base layer and one or more enhancement layers. A single-encoded video stream by an SHVC with spatial scalability can be used in a variety of devices with various resolutions (e.g., HD, FHD and UHD) without additional processing.

For reliable service in media streaming, several solutions are needed as described below.

The first is the scheduling of signaling messages. Since a signal message is necessary for a broadcast service because it contains important information such as location of a service, synchronization information between media streams, and decoding configuration, the MMT may require the signaling message to be transmitted at certain time intervals (e.g., 1 second) periodically.

However, this causes problems with low latency and transmission overhead. This can solve the problem by periodically transmitting a signal message in consideration of the video picture type. The video picture type includes inter-pictures (e.g., P and B pictures) that can be decoded on their own and are represented in terms of one or more adjacent pictures and intra-pictures (e.g., IDR, BLA and CRA) ). Even if the signal message is frequently transmitted, the broadcast message can not be provided if the MPU of the intra-picture is not received at the receiver. Therefore, it is preferable that the signal message is transmitted immediately before the MPU of the inter-picture.

The second solution is an encapsulation method for random access. Because the broadcasters do not know when the user will access the service, there is a need for an encapsulation method that allows the user to view the selected content at low latency.

An encapsulation method for randomly concatenating SHVC encoded video streams, the MPU has metadata including an encoded raw-formatted stream and a set of parameters. The parameter set includes VPS (Video Parameter set), SPS (Sequence Parameter set) and PPS (Picture Parameter Set).

The stream of the encoded low format is loaded into the mdat box and the metadata is loaded into the Configuration box (eg hvc1, lhv1) in the track box (trak). This parameter set contains decoding information. Each layer that is scalably encoded has a set of parameters for its layer. However, they must be rearranged in the order in which they are requested when a set of parameters is input to a decoder having a low formatted stream.

Figure 3 is a diagram illustrating that each layer of SHVC-encoded video with three layers is encapsulated into a set of re-ordered parameters. When this process runs on the receiver, it takes time and results are delayed. To reduce the delay, the reordered parameters are added before the video stream in the low format encoded in the MPU when encapsulated in the transmitting end, as shown in FIG.

The third solution is a synchronization method for a scalable video stream transmitted over a heterogeneous network. As shown in FIG. 3, the SHVC-encoded video stream has three layers L0, L1 and L2. Each layer is encapsulated in the MPU along with its own information. The MPUs for L0 and L1 are transmitted over the broadcast network together with the audio and signal messages, and the MPU for L2 is transmitted over the HTTP network. MPUs delivered over different heterogeneous networks must be merged into a single piece of content using a synchronization method.

In the MMT, a composition layer provides information on the time relationship between media contents and the dependency relation between media data (e.g., scalable video layer, audio data, etc.). This information is called CI (Composition Information). MXD (MMT eXtension Document) is an XML-formatted document with a list of segments in the enhancement layer.

The CI document and MXD are delivered as signal messages. The receiving end parses the signaling message to obtain the physical address of the CI document and the MXD. You can then obtain the MXD by requesting it to the web server with that address. Appropriate segments among the segments listed in the MXD are selected through a selection algorithm for media synchronization. The receiving end may request the selected segment to the web server, and may refer to the CI to merge the media segments.

4 is a diagram illustrating an 8K broadcast service architecture over a heterogeneous network.

For the 8K broadcasting service, the content server (content provider) 100 first acquires the 8K content and extracts it by media type (video and audio).

The extracted 8K video stream is divided into four areas (Area1, Area2, Area3, Area4) as shown in Fig. The divided 4K videos are treated as independent assertions, which are media data with unique identifiers. Then, each 4K stream is encoded into SHVC to generate three layers L0, L1 and L2. Thus, the original 8K video is composed of 12 (= 4 * 3) layers, that is, 12 assets. The audio stream is encoded by AAC.

MMT signal / MMTP generator 210 receives 1) an encoded stream of audio, L0 and L1, 2) encapsulates each stream into MPUs, 3) generates a signal message containing the service and each piece of media information And 4) generates two MMTP streams. The main stream has audio, L0 and signal messages, and the second stream has packets for L1.

The signal generator 220 generates a broadcast signal from an MMTP stream received from the MMT signal / MMTP generator 210 according to a broadcasting standard such as ATSC 3.0, DVB-T2, and the like.

The HTTP service generator 310 generates an MXD for the L2 and stores the document and the L2 stream in the HTTP streaming server. The HTTP streaming server 320 provides the streaming service for the L2 through the broadband network at the request of the receiving end.

The 8K broadcast system shown in FIG. 4 performs the above-described signal message scheduling method, the encapsulation method for random access, and the synchronization method.

The user can watch the content according to the performance of the decoder that decodes the broadcast signal received from the receiver 400 to generate content and the display 500 that displays the generated content. For example, a 2K-resolution TV must receive L0 data of each area through a broadcast network.

In addition, a user having an 8K-resolution TV connected to a broadcasting network and a broadband network can view 8K contents. The L2 data for the four areas are transmitted through the broadband network, and the remaining data is transmitted through the broadcast network.

6 is a diagram illustrating a UHDTV service scenario according to a change in network environment. As shown in FIG. 6, the 8K content starts at "t2" when data of all layers is received over the heterogeneous network. On the other hand, if the L2 data of an arbitrary area is not received or is broken due to the fluctuating bit rate at tn, the content is changed to a lower resolution.

In the 8K broadcasting system, the transmitting end must inform the receiving end that each divided area belongs to one piece of content. This is because one piece of content is transmitted in several parts.

In addition, since a plurality of divided areas must be merged into one content, a service delay may occur. Therefore, a content synchronization method is needed to reduce the delay.

Hereinafter, the MMT signal / MMTP generator 210 constituting the transmitting terminal of the 8K broadcasting system shown in FIG. 4 will be described in detail with reference to FIG. 7 is a detailed block diagram of the MMT signal / MMTP generator 210. FIG.

As shown in FIG. 7, the MMT signal / MMTP generator 210 includes an MPU component 211 for encapsulating regionally / hierarchically divided video and audio to generate an MPU, a CI component 212 for generating a CI A signal message component 213 for generating a signal message, and an MMTP stream component 214 for generating an MMTP stream.

The MMTP stream component 214 includes an MMPT scheduler 215 that schedules MMPT packets to reduce the time it takes to merge the data in each region.

The CI component 212 generates CI and HTML5 documents. The CI document is defined by an XML schema and includes a plurality of elements that refer to the elements defined in the HTML5 document with IDs as shown in Fig.

The 'view' element provides time information about the changes in the view and its regions, and the 'MediaSync' element provides time information about the representation of the media data. In addition, a 'group' element is added that provides information about the assets that should be displayed together. Here, each 'div' contains a set of assets in the same layer (L0, L1 and L2).

The signal message generated by the signaling message component 213 carries the multimedia structure, MMTP configuration information, and MMT payload format information transmitted from the MMTP stream.

Five types of signal messages, such as PA (Packet Access) message, MPI (Media Presentation Information) message, MPT (MMT Package Table) message, CRI (Clock Relation Information) message and DCI Is defined in the MMT standard.

Each signal message has one or more tables. One of them, the MP table, contains information about the package that contains a list of all assets. Because all the layered video streams that are divided are considered as assets, there must be information about the relationship between the assets.

The group includes the assets of the respective regions constituting the same layer. Since the number of regions is four, there are four assets in one group and three in the hierarchy, so there are three groups in one package.

In the embodiment of the present invention, 'Group_descriptor ()' is added to the MP table of the MPI message as shown in FIG. 9 to provide the above information. The value of 'num_of_groups' means the number of groups included in this package.

The information on each group is obtained by 'Group_descriptor ()', and the syntax of Group_descriptor () is shown in FIG.

The MPU generated by the MPU component 211 and the signal message generated by the signal message component 213 are loaded into the MMT packet for transmission over the heterogeneous network. The MMTP stream component 214 sets the value of each field of the MMTP header according to the media type and schedules the order in which each packet is transmitted.

The receiving end can know what type of data is included in the MMTP payload according to the 'type' value of the MMTP header. To do this, it is possible to first find the packets of the signal message packet, parse each signal table, and obtain the 'packet_id' value for each asset.

Although the MPU can be obtained through 'packet_id', the receiving end can not know whether the MPU is for video or audio. Also, in the case of video, it is not known what layer and area it is.

If the receiver can obtain this information before fully parsing the MMTP header, it can reduce the time it takes to decode the video stream. Accordingly, in the embodiment of the present invention, a rule for generating the 'packet_id' field value of the MMTP header is presented in order to quickly classify a packet received at the receiving end.

FIG. 11 shows the structure of the packet_id, and FIG. 12 shows details of the information constituting the packet_id. As shown, the length of the packet_id is 2 bytes.

The first bit is a video indicator (v_i) indicating whether the packet containing the packet_id field is video. If v_i is set to '0', it indicates that the packet contains data other than video. If v_i is set to '1', it means that the packet contains video data.

The remainder of the packet_id is divided into three parts: layer information (layer_info), area information (area info.), and id information (id info.).

The layer information includes information about the layer to which the video belongs. The video data transmitted through the broadcast network is L0 or L1. As shown in FIG. 12, if the layer information is set to '0', the video packet is a video packet for L0, and if the layer information is set to '1', the video packet is a video packet for L1.

'Area information' means a region of video data, that is, a position on the screen (see FIG. 5). As shown in FIG. 12, when the area information is set to '00', the video packet is a video packet for Area 1, and when the area information is set to '01', the video packet is a video packet for Area 2, If the information is set to '10', the video packet is a video packet for Area 3, and if the area information is set to '11', the video packet is a video packet for Area 4.

In FIG. 13, the value of 'packet_id' and the description thereof are shown in the table.

Another way to reduce broadcast service delay is scheduling. If the area data is not received or the order between the area data is not received, a delay occurs. Accordingly, in the embodiment of the present invention, the receiving end can not decode the data of the area-2 if the data of the area-1 does not arrive, and can decode the data of the area-3 if the data of the area- I have no policy. Area data must arrive in area-number order.

To this end, the MMPT scheduler 215 schedules MMTP packets according to the area information as shown in FIG. 14, when the MPU is generated as an MMTP packet, the MMPT scheduler 215 transmits packets including data of the same layers in each area to the area- Scheduled in numerical order.

It goes without saying that the technical idea of the present invention can also be applied to a computer-readable recording medium having a computer program for performing the functions of the apparatus and method according to the present embodiment. In addition, the technical idea according to various embodiments of the present invention may be embodied in computer-readable code form recorded on a computer-readable recording medium. The computer-readable recording medium is any data storage device that can be read by a computer and can store data. For example, the computer-readable recording medium may be a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical disk, a hard disk drive, or the like. In addition, the computer readable code or program stored in the computer readable recording medium may be transmitted through a network connected between the computers.

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 detail may be made therein without departing from the spirit and scope of the present invention.

100: Content server (content provider)
210: MMT signal / MMTP generator 210
211: MPU component
212: CI component
213: Signal message component
214: MMTP stream component
215: MMPT scheduler
220: Signal generator
310: HTTP Service Generator
320: HTTP streaming server
400: receiver
500: Display

Claims (15)

A content server that divides the content into a plurality of regions and encodes each of the divided regions into a plurality of layers;
A first generator for encapsulating each of the encoded layers with an MPU (Media Processing Unit) and generating an MPU for some layers as a first MMTP (MPEG Media Transport Protocol) packet; And
And a second generator for generating and transmitting a broadcast signal from the first MMTP packet generated by the first generator,
The divided regions,
Are generated as independent assets with unique identifiers,
The first generator comprises:
A first component for generating an MPU;
A second component for generating CI (Composition Information);
A third component for generating a signal message with reference to the CI;
And a fourth component for generating a first MMTP stream with an MPU and a signal message for some of the layers,
In CI,
Group information including information of the assets to be displayed together is included,
In the group information,
Wherein the set of assets constituting the same layer is listed.
delete delete delete delete The method according to claim 1,
The third component,
Wherein the group information is stored in an MP table of an MPI (Media Presentation Information) message, which is one of the signal messages.
A content server that divides the content into a plurality of regions and encodes each of the divided regions into a plurality of layers;
A first generator for encapsulating each of the encoded layers with an MPU (Media Processing Unit) and generating an MPU for some layers as a first MMTP (MPEG Media Transport Protocol) packet; And
And a second generator for generating and transmitting a broadcast signal from the first MMTP packet generated by the first generator,
The divided regions,
Are generated as independent assets with unique identifiers,
The first generator comprises:
A first component for generating an MPU;
A second component for generating CI (Composition Information);
A third component for generating a signal message with reference to the CI;
And a fourth component for generating a first MMTP stream with an MPU and a signal message for some of the layers,
In CI,
Group information including information of the assets to be displayed together is included,
The fourth component,
The header of the first MMTP packet includes information indicating whether the data of the payload of the first MMTP packet is video data, information on the layer in the case of video data, and a packet ID including information on the area. Based MMT based broadcasting system.
A content server that divides the content into a plurality of regions and encodes each of the divided regions into a plurality of layers;
A first generator for encapsulating each of the encoded layers with an MPU (Media Processing Unit) and generating an MPU for some layers as a first MMTP (MPEG Media Transport Protocol) packet; And
And a second generator for generating and transmitting a broadcast signal from the first MMTP packet generated by the first generator,
The divided regions,
Are generated as independent assets with unique identifiers,
The first generator comprises:
A first component for generating an MPU;
A second component for generating CI (Composition Information);
A third component for generating a signal message with reference to the CI;
And a fourth component for generating a first MMTP stream with an MPU and a signal message for some of the layers,
In CI,
Group information including information of the assets to be displayed together is included,
The fourth component,
And a scheduler for scheduling the first MMTP packet according to the area information.
The method of claim 8,
The scheduler,
And scheduling packets including areas of the same layer in order of area numbers.
A content server that divides the content into a plurality of regions and encodes each of the divided regions into a plurality of layers;
A first generator for encapsulating each of the encoded layers with an MPU (Media Processing Unit) and generating an MPU for some layers as a first MMTP (MPEG Media Transport Protocol) packet; And
And a second generator for generating and transmitting a broadcast signal from the first MMTP packet generated by the first generator,
The divided regions,
Are generated as independent assets with unique identifiers,
The first generator comprises:
A first component for generating an MPU;
A second component for generating CI (Composition Information);
A third component for generating a signal message with reference to the CI;
And a fourth component for generating a first MMTP stream with an MPU and a signal message for some of the layers,
In CI,
Group information including information of the assets to be displayed together is included,
The fourth component,
And the second MMTP packet is generated by the MPU for the remaining layers.
The method according to claim 1,
A third generator for generating an MXD (MXT Extension Document) required to provide a second MMTP packet generated by the fourth component over HTTP; And
And a streaming server for streaming the second MMTP packet and the MXD in HTTP.
The method according to claim 1,
The content is 8K video,
And the divided areas are 4K video sizes.
Dividing the content into a plurality of regions, and encoding each of the divided regions into a plurality of layers;
Encapsulating each of the encoded layers with an MPU (Media Processing Unit), and generating an MPU for a certain layer as a first MMTP (MPEG Media Transport Protocol) packet; And
And generating and transmitting a broadcast signal from the first MMTP packet,
The divided regions,
Are generated as independent assets with unique identifiers,
In the generating step,
Generates an MPU, generates CI (Composition Information), generates a signal message with reference to the CI, generates a first MMTP stream using an MPU and a signal message for some layers,
In CI,
The group information including the information of the assets to be displayed together is included,
In the group information,
Wherein the set of assets constituting the same layer is listed.
A receiver for receiving a broadcast signal from a broadcast transmission system and decoding the received broadcast signal to generate a content; And
And a display for displaying content generated at the receiver,
In the broadcast transmission system,
Encapsulates each of the encoded layers into a plurality of layers, encapsulates each of the encoded layers with an MPU (Media Processing Unit), and encapsulates the MPU for some layers into a first MMTP And generates a broadcast signal from the generated first MMTP packet,
The divided regions,
Are generated as independent assets with unique identifiers,
In the broadcast transmission system,
Generates an MPU, generates CI (Composition Information), generates a signal message with reference to the CI, generates a first MMTP stream using an MPU and a signal message for some layers,
In CI,
Group information including information of the assets to be displayed together is included,
In the group information,
And a plurality of asset sets constituting the same layer are listed.
Receiving a broadcast signal from a broadcast transmission system, and decoding the received broadcast signal to generate a content; And
And displaying the generated content in the receiver,
In the broadcast transmission system,
Encapsulates each of the encoded layers into a plurality of layers, encapsulates each of the encoded layers with an MPU (Media Processing Unit), and encapsulates the MPU for some layers into a first MMTP And generates a broadcast signal from the generated first MMTP packet,
The divided regions,
Are generated as independent assets with unique identifiers,
In the broadcast transmission system,
Generates an MPU, generates CI (Composition Information), generates a signal message with reference to the CI, generates a first MMTP stream using an MPU and a signal message for some layers,
In CI,
Group information including information of the assets to be displayed together is included,
In the group information,
And a plurality of asset sets constituting the same layer are listed.

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