JP2001025023A - Video stream distribution method, distribution system and recording medium recording program of the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution method and the system for simultaneously reproducing video streams equal to or more than the capacity of a transmission line on many terminals at a timing intended by a provider without making them illicitly reproduced. SOLUTION: This system is provided with a video stream separation device 100, plural video stream connection devices 200, a video reproducing means 250 and a distribution means 300. The provider turns respective frames to packets by encoding video images by a video encoding system for performing encoding by at least two frame kinds, imparts an identification code to the respective packets, separates the packets by each frame kind and distributes them to a receiver with a time difference. The receiver rearranges and connects the packets distributed for each frame kind in a prescribed order by the identification codes imparted to the packets, reproduces them as the video streams and thus, obtains source video images.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video stream distribution method and a distribution system, and more particularly to a video stream distribution method and a distribution system provided with a video stream separating means and a video stream combining means.

[0002]

2. Description of the Related Art Conventionally, as a method of delivering a video as a video stream from a provider to a receiver, encoded video information is recorded on a recording medium such as a CD-ROM and sent to the receiver. A method of acquiring a video stream from a medium and a method of transmitting encoded video information to a receiver using a communication unit, and the receiver acquiring the video stream via the communication unit have been used.

In transmitting video information using communication means, a technique for transmitting a differential image from the immediately preceding image has been developed in order to perform video transmission with high efficiency.

On the other hand, many providers desire to transmit the same video stream so that a plurality of recipients can view the same video stream at the same time, and video information is simultaneously transmitted using communication means.

[0005]

In the case where a previously stored video stream is simultaneously reproduced on a large number of terminals at a timing intended by the provider, a method of streaming the video stream in real time is the same or more than the video stream. A transmission path with a transmission capacity was required. In addition, all data of the stored video stream is distributed in advance on a transmission line or distributed on a recording medium such as a CD-ROM, and a synchronization signal for reproduction is transmitted at a timing intended by the provider. Although the same simultaneous playback can be realized with a small transmission capacity by using a streaming method, there is a possibility that the playback side will play back the content on its own or in an unauthorized manner. There was a need to take measures to prevent undesired regeneration. An object of the present invention is to provide a distribution method and a system for simultaneously reproducing video streams larger than the capacity of a transmission path on a large number of terminals at the timing intended by a provider without illegal reproduction. It is in.

[0006]

According to the present invention, there is provided a video stream distribution method for distributing a video stream from a provider to a receiver, wherein the provider includes a video code encoding at least two types of frames. Each frame is converted into a packet by encoding the video by an encoding method, an identification code is assigned to each packet, the packet is separated for each frame type, a time difference is provided to a receiver, and the receiver is provided for each frame type. The delivered packets are rearranged in a predetermined order according to the identification code given to the packets, combined, and reproduced as a video stream to obtain an original video.

[0007] The frame type may be a key frame having information capable of forming one screen and a difference frame having only difference information from the previous frame, and may be received in a time zone after the provided time difference. The frame type of the packet distributed to the user is a key frame capable of reproducing one screen, and the key frame is data distributed using a transmission path that can be distributed to many terminals in a one-to-many manner. A packet delivered to a receiver does not have information that can form a single image by itself, and data is distributed using a transmission path that can be distributed one-to-many to a large number of terminals. The packet may be distributed to the receiver by at least one means of data distribution using the data distribution method and physical distribution of the recording medium on which the data is recorded, and the packets separated for each frame type are distributed to a large number of terminals in a one-to-many manner. Is delivered by a telecommunications service capable of receiving, the receiver may receive the packet by connecting to the telecommunications service from the terminal, and the packet separated for each frame type can be distributed to many terminals. The packet may be distributed by a data broadcasting service using radio waves, and the receiver may receive the packet by connecting to the data broadcasting service from a terminal.

It is desirable that the identification code assigned to each packet includes at least a serial number assigned in the order of frames of the video stream.

A video stream distribution method according to the present invention is a system for distributing a video stream from a provider to a receiver, comprising: a video stream separating device on the provider side; a video stream combining device on a plurality of receivers; The video stream combining device is connected to the video stream combining device, and includes a video reproducing unit that reproduces a video from the combined video stream, and a distribution unit that distributes video information from the video stream separating device to the plurality of video stream combining devices. The video stream separation device includes an input unit that inputs a video, a video stream generation unit that encodes a video with a plurality of frame types, and a packet that assigns an identification code to a packet formed for each frame and determines a frame type. Classification means, packet storage means for storing packets for each frame type, and output means for outputting the stored packets to the outside in a predetermined procedure. The video stream combining device includes an input unit for inputting a packet distributed from the video stream separating device, a packet storage unit for storing the packet for each frame type, a packet read from the packet storage unit, and the packet read by the identification code. And an output unit that outputs the packets rearranged in the frame order of the video stream as a video stream. The distribution means includes a telecommunication service that can be distributed one-to-many to a large number of terminals, a data broadcasting service by radio waves that can be distributed one-to-many to a large number of terminals, and a transmission path that can be distributed one-to-many to many terminals. At least one of data distribution used, data distribution using a one-to-one transmission path, and physical distribution of a recording medium on which data is recorded.

The video stream separating means may further include a recording medium, and each control means of the video stream separating means may be controlled by a video stream separating program recorded on the recording medium. The control means of the video stream combining means may be controlled by a video stream combining program recorded on the recording medium.

[0011] The recording medium on which the program of the present invention is recorded generates an information stream encoded with a plurality of frame types from a video, attaches an identification code, provides a time difference for each frame type, and outputs the information to a receiver. Record a control program for

[0012] In another aspect, a control program for reproducing a video as a video stream by combining packets distributed by a provider for each of a plurality of frame types in a predetermined order is recorded.

According to the present invention, a video stream is separated into two or more pieces of data, and one piece of data is transmitted to a large number of playback terminals or distributed by a recording medium before playback timing intended by a provider. The original video stream is reproduced by distribution and combining with the other data distributed at the timing intended by the provider.

For example, when a video stream is composed of an I frame having information of one entire screen in a frame and a P frame having information such as a difference from a previous frame, the P frame is recorded on a recording medium. The data is stored and distributed to the reproducing side in advance, and then the I frame is distributed through a transmission path such as a data broadcast at a timing intended by the provider.

On the reproducing side, the P-frame is read from the recording medium in advance, and is combined with the I-frame received from the transmission path to reproduce the original video stream. Since it is necessary to maintain the order of the frames when combining, the serial numbers are assigned to the encoded frames in ascending order. As described above, even in a transmission path having only a transmission capacity for transmitting an I-frame in real time, a video stream that requires a larger transmission capacity, including the I-frame and the P-frame, is distributed at a timing intended by the provider. , Can be played.

[0016]

Next, an embodiment of a video stream distribution system according to the present invention will be described with reference to the drawings. The video stream distribution system of the present invention separates one video stream into two or more types of data, and distributes (distributes) each separately, so that data distribution (broadcast) having only a small transmission capacity is achieved. The system also realizes simultaneous reproduction of a video stream having a larger capacity on a large number of terminals. For example, in a video encoding method such as MPEG, a key frame having information capable of forming one screen is divided into a difference frame having only difference information from a previous frame. Of these, only the difference information is distributed (distributed) to the reproducing side in advance, and is combined with a key frame transmitted later, whereby the original large-capacity video can be provided by a distribution system having a smaller capacity. By using transmission means that can distribute to a large number of terminals at the same time for distributing key frames, it is possible to provide a service that simultaneously reproduces video.

Since the difference information must be distributed in advance, the video must be a video encoded slightly before the time of distribution or a video stored in advance. As long as the video is stored, it is possible to include all the video in the medium to be distributed, but in that case, there is a possibility that the reproduction side will reproduce the video without permission or illegally. According to the present invention, unauthorized reproduction can be prevented by distributing (distributing) data other than the key data of the video before the reproduction, and distributing the key data for the first time during the reproduction.

FIG. 1 is a schematic diagram for explaining an image of transmitting an information stream according to the present invention in a plurality of information frame types. As shown in FIG. 1, when a video stream is composed of an I frame having information of the entire screen in a frame and a P frame having information such as a difference between the previous frame and the P frame, the P frame is recorded on a recording medium. And distributes it to the reproducing side in advance, and then distributes the I frame through a transmission path such as a data broadcast at a timing intended by the provider. On the reproduction side, the P frame is read in advance from the recording medium, and is combined with the I frame received from the transmission path to reproduce the original video stream.
Since it is necessary to maintain the order of the frames when combining, the serial numbers are assigned to the encoded frames in ascending order. As described above, even in a transmission path having only a transmission capacity for transmitting an I-frame in real time, a video stream that requires a larger transmission capacity, including the I-frame and the P-frame, is distributed at a timing intended by the provider. , Can be played. Here, an I-frame and a P-frame have been described as examples, but the present invention is not limited to this, and any frame type that can reduce the transmission capacity may be used.

FIG. 2 is a block diagram of the video stream distribution system according to the first embodiment of the present invention. Video stream distribution system 1 according to a first embodiment of the present invention
Is a video stream separating apparatus 100 on the provider side, a plurality of video stream combining apparatuses 200 on the receiver side, and a video playback unit 2 for playing back video from the combined video stream.
50, and a distribution unit 300 that distributes video information from the video stream separation device 100 to a plurality of video stream combination devices 200.

The video stream separating apparatus 100 includes an input unit 110 for inputting a video, a video stream generating unit 120 for encoding a video with a plurality of frame types, and an identification code given to a packet formed for each frame. A packet classification unit 130 for determining a frame type; and a packet storage unit 14 for storing packets for each frame type.
0 and output means 150 for outputting the stored packets to the outside in a predetermined procedure.

The video stream combining device 200 includes an input unit 210 for inputting a packet distributed from the video stream separating device 100, a packet storage unit 220 for storing the packet for each frame type, and a packet storage unit 220. And an assembling unit 230 for reading out the packets and rearranging the packets according to the identification code in the order of the frame of the video stream and deleting the identification codes, and an output unit 240 for outputting the packets rearranged in the frame order of the video stream as a video stream. ing.

The distribution means 300 includes a first distribution means 310 for distributing a key frame packet and a second distribution means 320 for distributing a packet other than a key frame.
These distribution means 310 and 320 are provided for one-to-many telecommunications service to many terminals, radio wave data service for one-to-many distribution to many terminals, and one-to-one distribution for many terminals. The purpose and operation of the distribution system from the data distribution using a multi-distributable transmission path, the data distribution using a one-to-one transmission path, and the distribution of recording media such as FDs, CD-ROMs, and DVDs that record data. Is selected according to the form. Packets of frames other than the key frame may be distributed by the first distribution unit. As the first distribution means 310, for example, a telecommunication service called Teledome (registered trademark) which can be simultaneously distributed to a large number of terminals, or a transmission means which can be simultaneously distributed to a large number of terminals, such as data broadcasting using radio waves, is used. The second distribution means further uses a transmission means using a communication line and a distribution means of a recording medium such as an FD, a CD-ROM, or a DVD in which video information is stored.

Next, the configuration of the video stream separating apparatus 100 will be described in detail. FIG. 3 is a block diagram of the video stream separating apparatus of FIG. The video stream separation device 100 includes an input unit 110, a video stream generation unit 120, a packet acquisition unit 131, a serial number assignment unit 132, a determination unit 133, and a first packet storage unit 1.
41, a second packet storage unit 142 to an n-th packet storage unit 14n, a distribution unit 151, a packet pre-distribution unit 152, and a control unit 160.

The video stream generation means 120 is a means for inputting a video such as a video NTSC signal from the input means 110 and coding the video by an encoding method having two or more types of frames. H. 261
For example, an encoder device that employs an encoding method such as MPEG1 or MPEG1 that forms a video stream by two or more types of frames can be used.

The packet acquisition means 131 is a means for acquiring a series of encoded video streams in packet units corresponding to each frame.
Numeral 2 is a means for assigning a serial number to each packet in the frame order of the video stream.
Reference numeral 3 denotes a unit that determines the type of frame used when encoding each packet frame. The first packet storage unit 141 and the second packet storage unit 142
The first to n-th packet storage means 14n are means for storing packets of the same type of frame, respectively, and may be a storage medium such as a memory inside a computer or a CD-ROM.

The packet pre-distribution means 152 converts the predetermined packets stored in the at least one packet storage means 141, 142 to 14n into the video stream combining device 20.
0 in advance, for example, data stored in a memory inside the computer may be distributed via a transmission path, or a storage medium such as an FD or a CD-ROM may be distributed by a distribution means. Is also good. The distribution unit 151 is a unit that transmits a packet serving as a key frame in real time in accordance with a distribution instruction using a communication line or a transmission path such as data broadcasting using radio waves.

The control section 160 is means for controlling each means by a video stream separation system control program.

Next, a video stream separation method will be described.
FIG. 4 is a flowchart showing a video stream separation method using the video stream separation device of FIG. Here, for simplicity of description, it is assumed that there are two types of frames, a key frame having information of one screen in a frame, and a difference frame having information regarding a difference from a previous frame. A description will be given assuming that a frame is composed of one packet, and a video stream is a data group composed of a plurality of these packets that are successively arranged.

When the processing is started (S101), a video to be distributed is input (S102), and a video to be distributed is input to the encoder device by the video stream generating means 120, and is converted into a video stream composed of two types of frames. The encoding is performed (S103). Packet acquisition means 131
Then, the video stream generated by the video stream generating means 120 is obtained in packet units (S104). Here, it is assumed that the video stream generating means 120 is in the video stream separating apparatus 100. However, the video stream generating means 120 may be external, and when transmitting the video stream packets generated by the encoder apparatus to the LAN, , Receive packets flowing on the LAN.

Next, in order to maintain the continuity of the video stream, a serial number is assigned to each packet by the serial number assigning means 132 in the order of reception (S105). In addition, in consideration of the case where there are a plurality of video streams and the case where the transmission path is different, information on the video stream or the transmission path is represented by an ID or the like, and if added together with the serial number, the information on the reproduction side can be obtained. Management is easy.

Next, the determining means 133 determines whether the packet is a key frame or a difference frame (S
106). Although the criterion differs depending on the encoding method, for example, a simple key frame having a larger packet size than other packets may be a key frame.
If the packet is a key frame (S106Y), the first
(S10).
7) If the packet is a differential frame (S106)
N), packets are stored in the second packet storage means 142 (S108). The first packet accumulating means 141, the second packet accumulating means 142 to the n-th packet accumulating means 14n are provided for each of the types identified by the discriminating means, such as a memory or a hard disk in a computer, or a medium such as an FD or a CD-ROM. To store the packet. The packet group other than the key frame stored here is distributed in advance by the packet pre-distribution means 152 before the video is reproduced by distribution through store distribution or mailing, or distribution through data broadcasting or the Internet. It is necessary to select a storage medium according to these distribution (distribution) means.
The packet group of the key frame is distributed by the distribution means 151 using a transmission line such as a communication line or a data broadcast using radio waves. Therefore, it is preferable to store the key group in a memory or a hard disk inside the computer.

When the accumulation of the packets is completed (S109)
Y), wait for an instruction to distribute the difference frame (S110)
N), when distribution of the difference frame is instructed (S110)
Y), the packet pre-distribution means 152 is selected (S11)
1) Output the packet of the second packet storage means 142 (S112). The packet pre-distribution unit 152 distributes (distributes) a part of the video stream distinguished by the determination unit 133 to the reproducing side before the distribution unit 151. It is possible to use the transmission path used by the distribution unit 151, but in this case, the distribution must be executed and completed before the distribution unit 151.

Next, a key frame distribution instruction is awaited (S113N). When distribution of a key frame is instructed (S113Y), the distribution means 151 is selected (S11).
4), output the packet of the first packet storage means 141 (S115). It is checked whether the serial number of the key frame to be output is equal to or less than the last serial number of the transmitted difference frame (S116). If it is not equal to or less than the last serial number of the difference frame (S116N), it is equal to or less than the last serial number of the difference frame. The output of the key frame is suspended until (S118), and if it is equal to or less than the final serial number of the difference frame, the output is continued until the output of the key frame is completed (S117N), and when the output of the key frame is completed (S117Y). , End the process (S11
9).

The distribution means 151 transmits the packet pre-distribution means 152 through the transmission path at the time intended by the video provider.
, The remaining packets distributed (distributed) are sequentially distributed in real time.

As described above, the original large-capacity video can be distributed and reproduced at the timing intended by the video provider using the transmission path having a smaller capacity. Next, the configuration of the video stream combining device 200 will be described. FIG. 5 is a block diagram of the video stream combining device of FIG. The video stream combining device 200 includes an input unit 210, a first packet storage unit 221, a second packet storage unit 222 to an n-th packet storage unit 22.
n, a packet acquisition unit 231, a rearrangement unit 232, a serial number deletion unit 233, an output unit 240, and a control unit 260. The output of the output unit 240 is input to the video reproduction unit 250 via the LAN, and Play the video. Here, the image reproducing means 250 is LA
It is assumed that they are connected by N, but they may be included in the video stream combining means 200.

The input means 210 is a packet pre-distribution means 152 and a distribution means 151 of the video stream separation means 100.
Via the first packet storage means 141 and the second packet storage means 142-
The separated packets of the video stream distributed or distributed from the n-th packet storage unit 14n are input, and the first packet storage unit 221 and the second
Packet storage means 222 to n-th packet storage means 2
2n.

The first packet storage means 221, the second packet storage means 222 to the n-th packet storage means 22n
May be a recording medium such as an FD, CD-ROM, or DVD in which frames constituting the video stream distributed from the video stream separating means 100 are stored as packets, or an internal memory of a computer.

One of the packet storage means is a means for storing, as packets, a key frame of a video stream input from the distribution means 151 of the video stream separation means 100 via a transmission line, and stores the key frames from the Internet or data broadcasting. It is a computer internal memory or hard disk that receives and stores information.

The packet acquiring means 231 stores the packets stored in the first packet storing means 221 and the second packet storing means 222 to the n-th packet storing means 22n.
This is means for reading from each storage means.

The reordering means 232 is means for combining the packets acquired by the packet acquiring means 231 from the respective accumulating means and combining and outputting the packets in ascending order of the serial number assigned to the packet.

The serial number deleting means 233 is a means for removing the serial number part given to the packet, and further deletes the ID provided in relation to the video stream and the transmission line, if any. . Thereby, the video stream is reproduced.

The output means 240 is means for transmitting the obtained video stream to the video reproducing means 250.

The control section 260 is a means for controlling each means by a video stream combination system control program.

The video reproducing means 250 is a means for reproducing a video from a video stream.

Next, a video stream combining method will be described.
FIG. 6 is a flowchart showing a video stream combining method using the video stream combining device of FIG. Here, for simplicity of description, it is assumed that there are two types, a key frame having information of one screen in a frame, and a difference frame having information on a difference from a previous frame.
One frame is composed of one packet, and a video stream is described as a data group composed of a plurality of these packets continuously.

When the process is started (S201), the input means 210 acquires the packet distributed from the packet pre-distribution means 152 of the video stream separation apparatus 100 (S2).
02), the packet is stored in the packet storage unit 220 corresponding to the packet storage unit 140 of the video stream separation apparatus 100 (S203). It waits for an instruction to assemble the packet distributed from the packet pre-distribution unit 152 (S204N), and if there is an instruction to assemble (S204Y), the packet acquisition unit 23
1, the target packet is acquired from the packet storage means 220 (S205), and the reordering means 232 sorts the packets in ascending order of the serial number assigned to each packet (S206). It waits for the acquisition (S209N).

On the other hand, a key frame packet distributed from the distribution unit 151 of the video stream separating apparatus 100 is acquired by the input unit 210 (S207), and the key frame packet storing unit 220 of the video stream combining apparatus 200 stores the key frame packet. It is stored (S208).

When a key frame packet is obtained (S
209Y), and waits for an instruction to assemble all packets (S210).
N), if there is an instruction to assemble all packets (S210Y),
The packet acquiring unit 231 acquires the key frame packet (S211), and the sorting unit 232 sorts and combines all the packets in ascending order of the serial number assigned to each packet (S212), and deletes the serial number. The means 233 deletes the identification code including the serial number assigned to each packet (S213), and outputs the obtained video stream from the output means 240 (S214).
The video is reproduced by the video reproducing means 250 (S215), and the process ends (S216).

In step S202, a CD-ROM is read from the recording medium in which the frames constituting the video stream obtained by the distribution by the input means 210 are stored as packets.
The packet may be read by a reproducing device or the like, or may be read from the internal memory of the connected computer in packet units.

In step 205, if there is a video stream different from the packet of the target video stream in the received packets, the ID of the video stream or transmission path information assigned to the packet is referred to. Different packets can be filtered to be deleted.

Step 207 is a step of receiving the key frame constituting the video stream as a packet through the transmission path, receiving the key frame through the Internet or data broadcasting, and storing it in the internal memory or the hard disk of the computer.

In step 214, the packet is transmitted in accordance with the video stream reproducing apparatus used in step 215 or the reproducing software running on the computer. For example, a form in which a packet is transmitted to the LAN and the video reproducing apparatus receives the packet from the LAN may be used.

As described above, the original large-capacity video can be received and reproduced at the timing intended by the video provider using the transmission path having a smaller capacity. Next, a video stream delivery system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a schematic block diagram of a video stream delivery system according to the second embodiment of the present invention.

FIG. 7 shows the video stream separating apparatus 100 and the video stream combining apparatus 200 of the video stream distribution system 1 according to the first embodiment of the present invention shown in FIG. 2 as computers constituting the apparatus. The computer includes input units 10 and 50 such as a modem, a keyboard, and a pointing device, a modem, a printer,
Output units 20 and 60 such as displays, data processing device 3
0, 70, storage units 40, 80 and recording media 51, 52
Is provided.

The recording medium 51 stores a video stream separation system control program of the present invention capable of controlling the operation of each unit. The recording medium 52 stores the video stream combining system control program of the present invention capable of controlling the operation of each unit. FD, CD-ROM, semiconductor memory, etc. are used in each case. Recording medium 51, recording medium 5
Although both are described as being provided, only one of them may be provided.

The configuration of the video stream distribution system and the video stream distribution method are the same as those in the first embodiment, and a description thereof will be omitted.

A control program for generating an information stream coded with a plurality of frame types from a video, providing an identification code, providing a time difference for each frame type, and outputting to a receiver is provided from a recording medium 51. Data processing device 30
And controls the operation of the data processing device 30. The data processing device 30 executes the following processing under the control of the control program.

That is, a process of coding a video by a video coding method of coding with at least two types of frames to convert each frame into a packet, a process of assigning an identification code to each packet, And a process of distributing the stored packets to the recipient at a predetermined timing by a predetermined distribution unit.

The control program for combining the packets distributed by the provider for each of a plurality of frame types in a predetermined order and reproducing the video as a video stream includes a recording medium 5
2 is read into the data processing device 70 and controls the operation of the data processing device 70. The data processing device 70 executes the following processing under the control of the control program.

That is, a process of accumulating packets distributed for each frame type for each frame type, reading out the packets stored for each frame type, and identifying the packet by the identification code given to the packet. A process of rearranging and combining in the order of the flow to delete the identification number, a process of outputting the obtained video stream, and a process of reproducing a video from the video stream are executed.

[0061]

As described above, according to the present invention, a part of a video stream to be provided is distributed to the reproducing side in advance, so that a transmission line having a small capacity requires a transmission line having a larger capacity. There is an effect that a video stream can be distributed. .

Further, if only data having difference information from the previous frame among the data obtained by encoding the video stream is distributed in advance, it is impossible to reproduce the video as a video by itself. There is an effect that cannot be reproduced. By distributing a key frame that can compose one screen by the provider and combining it with the difference frame, the video stream can be reproduced.

By distributing the key frame data using a transmission path capable of simultaneously distributing the key frame to a large number of terminals, there is an effect that a plurality of recipients can be simultaneously reproduced as a video.

Further, since only terminals having data distributed in advance can reproduce, there is also an effect that the end of reproducible data can be limited.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining an image of transmitting an information stream of a plurality of types of information frames according to the present invention.

FIG. 2 is a block diagram of a video stream distribution system according to the first embodiment of the present invention.

FIG. 3 is a block diagram of the video stream separation device of FIG. 2;

FIG. 4 is a flowchart illustrating a video stream separation method using the video stream separation device of FIG. 3;

FIG. 5 is a block diagram of the video stream combining device of FIG. 2;

FIG. 6 is a flowchart showing a video stream combining method using the video stream combining device of FIG. 5;

FIG. 7 is a schematic block diagram of a video stream delivery system according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 video stream distribution system 10, 50 input unit 20, 60 output unit 30, 70 data processing device 40, 80 storage unit 51, 52 recording medium 100 video stream separation device 110, 210 input means 120 video stream generation means 130 packet classification means 131 packet acquiring means 132 serial number assigning means 133 discriminating means 140, 220 packet storing means 141, 221 first packet storing means 142, 222 second packet storing means 14n, 22n nth packet storing means 150, 240 output means 151 distribution unit 152 packet pre-distribution unit 160, 260 control unit 230 assembling unit 231 packet acquisition unit 232 rearranging unit 233 serial number deletion unit 250 video playback unit 300 distribution unit 310 first distribution unit Stage (for key frame) 320 Second distribution means S101 to S119, S201 to S216 Step

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Katsumi Kishida Inventor F-term (reference) in Nippon Telegraph and Telephone Corporation 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo 5C059 MA05 PP05 PP06 RB02 RB15 RE15 UA34 5C064 BA02 BB05 BC06 BC10 BC16 BD08 BD09

Claims (11)

[Claims] 1. A method for delivering a video stream from a provider to a receiver, wherein the provider encodes a video using a video coding scheme that encodes at least two types of frames, and converts each frame into a packet. Assigning an identification code to each packet, separating the packets for each of the frame types, distributing the packets to a receiver with a time difference provided between the packets, and the receiver assigns the packets distributed for each of the frame types to the packets. A video stream distribution method, wherein the original video is obtained by rearranging the images in a predetermined order according to the assigned identification code, combining the images, and reproducing the resultant as a video stream. 2. The video stream distribution method according to claim 1, wherein the frame types are a key frame having information capable of forming one screen and a difference frame having only difference information from a previous frame. 3. The frame type of the packet delivered to the receiver in a time zone after the provided time difference is a key frame capable of reproducing one screen, and the key frame is transmitted to a large number of terminals. The packet is distributed using a transmission path that can be distributed in a multi-point manner, and the packet that is distributed to a receiver before the packet has no information that can alone constitute one image, and is transmitted to a large number of terminals in a one-to-many manner. 2. The data delivery method according to claim 1, wherein the data is delivered to the receiver by at least one of a data delivery using a transmission path that can be delivered by a user, a data delivery using a one-to-one transmission path, and a physical distribution of a recording medium on which data is recorded. Video stream distribution method. 4. The method according to claim 1, wherein each of the packets separated for each frame type is distributed by a telecommunication service that can be distributed to many terminals in a one-to-many manner, and a receiver connects to the telecommunication service from the terminal. The video stream distribution method according to claim 1, wherein the packet is received by the video stream. 5. The packet separated for each frame type is distributed by a data broadcasting service using radio waves that can be distributed to a large number of terminals, and a receiver connects to the data broadcasting service from a terminal to receive the packet. The video stream distribution method according to claim 1, wherein the video stream is received. 6. The video stream distribution method according to claim 1, wherein the identification code given to each packet includes at least a serial number assigned in the order of frames of the video stream. 7. A system for delivering a video stream from a provider to a receiver, comprising: a provider-side video stream separation device; a plurality of receiver-side video stream combining devices; and a connection to the video stream combining device. A video playback unit that reproduces a video from the combined video stream; and a distribution unit that distributes video information from the video stream separation device to the plurality of video stream combination devices. Input means, a video stream generating means for encoding video in a plurality of frame types, a packet classifying means for assigning an identification code to a packet formed for each frame to determine the frame type, and a frame type for each frame type. Packet storing means for storing the packets in the memory, and outputting the stored packets to the outside in a predetermined procedure And a stage, a video stream coupled device, input means for inputting the packets delivered from the video stream separating device,
Packet accumulation means for accumulating the packets for each frame type; assembling means for reading the packets from the packet accumulation means, rearranging the packets by the identification code in the frame order of the video stream, and deleting the identification code; Output means for outputting, as a video stream, packets rearranged in frame order of the video stream, wherein the distribution means is a telecommunication service that can be distributed to many terminals in a one-to-many manner; Data distribution service using radio waves that can be distributed by a user, data distribution using a transmission path that can be distributed one-to-many to many terminals, data distribution using a one-to-one transmission path, and logistics of a recording medium on which data is recorded. At least one video stream distribution system. 8. The video stream distribution apparatus according to claim 7, wherein said video stream separation means further comprises a recording medium, and each control means of said video stream separation means can be controlled by a video stream separation program recorded on said recording medium. system. 9. The video stream distribution apparatus according to claim 7, wherein said video stream combination means further comprises a recording medium, and each control means of said video stream combination means can be controlled by a video stream combination program recorded on said recording medium. system. 10. A recording in which a control program for generating an information stream coded with a plurality of frame types from a video, providing an identification code, providing a time difference for each frame type, and outputting to a receiver is recorded. A medium, a procedure of encoding each frame into a packet by encoding a video by at least two types of frames, and a step of assigning an identification code to each packet; A machine-readable recording medium storing a program for executing a procedure of storing the packets separately for each frame type and a procedure of distributing the stored packets to a receiver at a predetermined timing by a predetermined distribution unit. . 11. A recording medium storing a control program for reproducing a video as a video stream by combining packets delivered by a provider for each of a plurality of frame types in a predetermined order, Storing the delivered packets for each frame type, reading the packets stored for each frame type, and rearranging the packets in the order of the video stream flow according to the identification code assigned to the packets; Join
A machine-readable recording medium recording a program for executing the steps of deleting the identification number, outputting the obtained video stream, and reproducing the video from the video stream.