WO2009104639A1 - 映像配信装置、映像配信システム及び映像配信方法 - Google Patents
映像配信装置、映像配信システム及び映像配信方法 Download PDFInfo
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- WO2009104639A1 WO2009104639A1 PCT/JP2009/052785 JP2009052785W WO2009104639A1 WO 2009104639 A1 WO2009104639 A1 WO 2009104639A1 JP 2009052785 W JP2009052785 W JP 2009052785W WO 2009104639 A1 WO2009104639 A1 WO 2009104639A1
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- 238000009826 distribution Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims description 57
- 230000008859 change Effects 0.000 claims abstract description 76
- 238000012508 change request Methods 0.000 claims description 46
- 238000007726 management method Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 25
- 238000002716 delivery method Methods 0.000 claims 3
- 238000003860 storage Methods 0.000 description 13
- 230000003139 buffering effect Effects 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
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- 230000000694 effects Effects 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234327—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by decomposing into layers, e.g. base layer and one or more enhancement layers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/65—Transmission of management data between client and server
- H04N21/658—Transmission by the client directed to the server
- H04N21/6587—Control parameters, e.g. trick play commands, viewpoint selection
Definitions
- the present invention relates to a video distribution device, a video distribution system, and a video distribution method, and more particularly to a technique that is preferably applied to a video content distribution service that requires real-time performance at a high bit rate.
- FTTH Fiber To The Home
- NGN Next Generation Network
- FTTH Fiber To The Home
- NGN Next Generation Network
- the content distribution service is not only for viewing from content prepared by a provider such as VoD (Video on Demand), but also for nDVR (users to record or view broadcast content on the server automatically by designating the broadcast content)
- VoD Video on Demand
- nDVR users to record or view broadcast content on the server automatically by designating the broadcast content
- a new video viewing service called network-based Digital-Video Recorder
- the video distribution server When viewing video content via a network, such as a television broadcast, the video distribution server only sends a stream to the player sequentially from the beginning of the content.
- video services that deliver stored content such as VoD and nDVR on demand
- trick play functions such as fast forward, rewind, and pause.
- trick play functions such as frequent use of fast-forwarding are becoming more important than ever in order to find a desired scene from the recorded result.
- Patent Document 1 An example of a fast-forwarding method for stored content is described in Patent Document 1. This method realizes double-speed fast-forwarding, so that the read processing is performed at a double rate, the time information related to decoding and reproduction added to the data is changed to a half value, and according to the time information Perform decoding and playback processing. This realizes fast-forwarding of content at double speed.
- Patent Document 2 An example of another fast-forwarding method for stored content is described in Patent Document 2.
- decoding is performed after thinning processing is performed in units of frames in accordance with a specified fast-forwarding magnification.
- thinning out is realized, and fast forward is realized.
- JP 2002-354419 A JP 2006-295645 A
- the present invention can realize a smooth change in reproduction speed without increasing the data transfer rate from the normal reproduction, and can reduce the decoding load even when the reproduction speed is changed.
- An object is to provide a possible video distribution apparatus, video distribution system, and the like.
- a first video distribution device is a video distribution device that distributes video content including a basic signal and one or more extended signals configured in a hierarchical manner, Content reading means for reading the basic signal and the extension signal therein at independent bit rates, and a playback speed changing means for changing the content playback speed by specifying a read bit rate for each signal in the content reading means.
- the first video receiving apparatus of the present invention is a video receiving apparatus that receives video content including a basic signal and one or more extension signals configured in a hierarchical manner from a video distribution apparatus, wherein A request to change the magnification of the playback speed of the video content is sent to a video distribution device that reads the signal and the extension signal at independent bit rates and changes the playback speed of the video content by specifying a read bit rate for each signal.
- a first video distribution system receives a video distribution device that distributes video content including basic signals and one or more extended signals configured in a hierarchy, and a video content distributed by the video distribution device.
- a video receiving system comprising: a content reading unit that reads a basic signal and an extension signal in video content at independent bit rates; And a playback speed change means for changing the content playback speed by designating a read bit rate of the video, and the video receiving apparatus includes a playback speed change request means for sending a video content playback speed magnification change request to the video distribution apparatus,
- the video decoding process is performed according to the time information added to the video content received from the video distribution device. Comprising a decoding means.
- a first video reproduction device of the present invention receives a video distribution device that distributes video content including basic signals and one or more extended signals configured in a hierarchy, and a video content distributed by the video distribution device.
- a video playback device configured to connect both devices to each other via a bus, wherein the video distribution device reads the basic signal and the extension signal in the video content at independent bit rates.
- a playback speed changing means for changing the content playback speed by specifying a read bit rate for each signal in the content reading means
- the video receiving apparatus issues a video content playback speed magnification change request to the video According to the playback speed change requesting means to be sent to the distribution device and the time information added to the video content received from the video distribution device
- a decoding means for performing an image decoding process.
- a first video distribution method is a video distribution method for distributing video content including a hierarchical basic signal and one or more extended signals, wherein the basic signal and the extended signal in the video content are distributed.
- a read speed change step for changing the content playback speed by specifying a read bit rate for each signal, and a content read step for reading each signal at an independent bit rate according to the bit rate specified by the playback speed change step And having.
- a first video receiving method of the present invention is a video receiving method for receiving video content including a basic signal configured in a hierarchical manner and one or more extended signals from a video distribution device, wherein the basic content in the video content is A request to change the magnification of the playback speed of the video content is sent to a video distribution device that reads the signal and the extension signal at independent bit rates and changes the playback speed of the video content by specifying a read bit rate for each signal. A playback speed change requesting step to be transmitted; and a decoding step for performing video decoding processing in accordance with time information added to the video content received from the video distribution device.
- the first program of the present invention is a program used in a video distribution device that distributes video content including hierarchical basic signals and one or more extended signals.
- each signal is independently bit rated according to the bit rate specified by the playback speed change function that changes the content playback speed by specifying the read bit rate for each signal and the playback speed change function.
- a content reading function to be read by the user.
- a second program of the present invention is a program used in a video receiving apparatus that receives video content including a basic signal and one or more extended signals configured in a hierarchical manner from a video distribution apparatus.
- Video content playback speed for video distribution devices that change the playback speed of video content by reading the basic signal and extension signal in the video content at independent bit rates and specifying the read bit rate for each signal.
- a playback speed change request function for sending a request for changing the magnification and a decoding function for performing video decoding processing according to time information added to the video content received from the video distribution apparatus.
- the first recording medium of the present invention is a computer-readable recording medium on which the above program is recorded.
- a smooth reproduction speed change can be realized without increasing the data transfer rate from the normal reproduction, and the decoding load can be reduced even when the reproduction speed is changed.
- the present invention provides a video distribution device that distributes video content to a video reception device via a network, and stops the distribution of all or part of the enhancement layer stream and the basic layer stream that is essential for reproduction and the extension that does not stop the distribution. It is characterized in that by increasing the layer stream distribution rate, the video playback rate is changed while keeping the entire network bandwidth constant.
- a video distribution device that distributes video content to a video reception device via a network, and stops the distribution of all or part of the enhancement layer stream and the basic layer stream that is essential for reproduction and the extension that does not stop the distribution. It is characterized in that by increasing the layer stream distribution rate, the video playback rate is changed while keeping the entire network bandwidth constant.
- FIG. 1 is a schematic diagram showing a configuration of a video distribution system according to an embodiment of the present invention.
- the video distribution device 100 and the reception device 200 that constitute the video distribution system of the present embodiment are terminals that can communicate with each other via the network 300.
- the distribution device 100 is a device that holds video content and distributes the video content to the video reception device 200 on the network 300.
- the video receiving device 200 is a device that receives and reproduces video content from the video distribution device 100 on the network 300.
- the network 300 is a network that enables communication between terminals.
- the network 300 is the Internet. However, it is not limited to a server device, a PC (Personal Computer), or the Internet, but may be an NGN, a mobile phone network, a wireless LAN (Local Area Network), a bus inside the device, or the like.
- the video distribution apparatus 100 is assumed to be a streaming server in this embodiment, but may be a PC, a HDD (Hard Disk Drive) recorder, or the like.
- the video receiving apparatus 200 is assumed to be a PC in this embodiment, but may be a mobile phone, a PDA (Personal Digital Assistant), a network connectable TV, a game machine connected to a TV, or the like.
- FIG. 2 is a functional block diagram showing the configuration of the video distribution apparatus according to this embodiment.
- the video distribution apparatus 100 includes a content storage unit 101, a content reading unit 102, a packetizing unit 103, a time information setting unit 104, a sending unit 105, a content information management unit 10, a playback speed changing unit 107, a playback It is composed of speed change request accepting means 108. Each of these means operates as follows.
- the content storage unit 101 is a storage medium in which video content encoded using a scalable codec is stored.
- the video content is H.264.
- the image data is compressed by a H.264 / SVC (Scalable Video Video Coding) encoder and includes a base layer and two enhancement layers (first enhancement layer and second enhancement layer).
- the first enhancement layer is a bit stream located above the base layer. By decoding the first enhancement layer together with the base layer, it is possible to obtain an image quality higher than the result of decoding only the base layer.
- the second enhancement layer is a bit stream located above the first enhancement layer, and the result of decoding only the base layer and the first enhancement layer by decoding the second enhancement layer together with the base layer and the first enhancement layer. The above image quality can be obtained.
- the content stored in the content storage unit 101 includes the information shown in FIG.
- the content information 301 is data used at the time of content distribution, and includes information shown in FIG.
- the layer type 401 is information indicating what layer the content is composed of.
- the layer identifier 402 is an identifier for associating each layer with a NAL (Network Abstraction Layer) unit constituting the video stream 302 stored in the content.
- the bit rate 403 is a bit rate for each layer.
- the data structure of the content is an example in the present embodiment, and may be in other formats. For example, it corresponds to the case where the content information 301 is separated into different files, or the case where the video stream 302 is in another format such as MPEG (Motion Picture Expert Group) -2TS (Transport Stream) format. Further, any format may be used as long as the content reading unit 102 can read content in units of layers and can acquire bit rate information of each layer. In the present embodiment, the audio data is omitted for easy explanation.
- the content information management means 106 is means for holding the content information 301 stored in the content storage means 101 and providing it to the playback speed changing means 107 as necessary.
- this information is the content information 301 stored in the content storage unit 101.
- a message from the encoder that created the content in the content storage unit 101 is displayed.
- Other sources, such as when receiving, may also be used.
- the content reading unit 102 is a unit that reads a stream of a specified layer from the content storage unit 101 at a specified bit rate. At the time of reading, the content reading unit 102 receives designation from the playback speed changing unit 107 regarding which layer in the content stored in the content storage unit 101 is to be read and the read bit rate of each layer.
- the playback speed changing means 107 sends the basic layer, the first enhancement layer to the content reading means 102. Then, an instruction to read out the identifier 1, identifier 2, and identifier 3, which are layer identifiers of the second enhancement layer, and each layer at 1 Mbps is issued.
- the content reading unit 102 stores the H.264 content stored in the content storage unit 101.
- the H.264 / SVC stream is read, and NAL units with identifier 1, identifier 2, and identifier 3 are sent to the packetizing means 103.
- processing is performed in accordance with the read bit rate for each layer determined by the playback speed changing unit 107.
- the packetizing means 103 is an H.264 packet sent by the content reading means 102. This is a means for packetizing the H.264 / SVC NAL unit to be sent to the network 200.
- the packetization method in this embodiment, the Internet-Engineering-Task-Force (IETF) draft-ietf-avt-rtp-svc-01 RTP (Real-time Transport-Protocol) packet format based on "RTP Payload Format for SVC Video" is used.
- IETF Internet-Engineering-Task-Force
- RTP Real-time Transport-Protocol
- the time information setting unit 104 is a unit that adds time information at a clock rate specified to the packet generated by the packetizing unit 103. In the packetization process, the time information setting unit 104 receives a setting of the clock rate used for generating the time information from the reproduction speed changing unit 107. In the present embodiment, during normal playback, time information with an increase rate of 90,000 per second of video content is set as the time stamp of the RTP header by setting a clock rate of 90 kHz, which is a standard value determined by the RTP packetization standard. Append. When performing fast-forward playback, a new clock rate is designated from the playback speed changing means 107. The time information setting means 104 sends the packet to the sending means 105 after adding the time information to the RTP time stamp.
- the sending means 105 is means for sending a packet to the network 300.
- processing for sending a packet from the network interface card to the Internet is performed using a socket API (Application Program Interface).
- the sending process is performed at the timing when a packet is received from the time information setting unit 104.
- priority information may be added to IP (Internet Protocol) packets of each layer.
- the playback speed change request accepting means 108 is a means for accepting a playback speed change request message from the video receiving device 200 connected via the network 300.
- RFC Request For Comments
- 2326 RTSP Real Time Streaming Protocol
- another communication protocol that can request a change in playback speed may be used.
- the video receiving apparatus 200 When requesting the video delivery apparatus 100 to change the playback speed, the video receiving apparatus 200 sends a message with a Scale header indicating the playback speed magnification added to the PLAY method. For example, when double fast-forward playback is requested, a header “Scale: 2.0” is added to the PLAY method.
- the playback speed change request receiving means 108 Upon receiving the playback speed change request message, the playback speed change request receiving means 108 notifies the playback speed changing means 107 of a request for changing the playback speed magnification.
- a playback speed change response message is returned to the video receiving apparatus 200 as an ACK method indicating that effect.
- the playback speed changing means 107 is a means for obtaining the playback speed magnification from the playback speed change request receiving means 108 and determining the change of the read bit rate for each layer of the video content.
- the reproduction speed changing unit 107 acquires content layer information and bit rate information to be distributed from the content information management unit 106. In addition, a usable network bandwidth is designated by the user.
- the reproduction speed changing means 107 receives designation of the usable network band Ball from the user.
- Ball 3 Mbps.
- the read bit rate of the base layer is 1.5 Mbps
- the unused band is 1.5 Mbps due to the difference from the usable network band Ball.
- the transmission process including the upper extension layer may be performed. At this time, it becomes possible to view fast-forward video with higher image quality than when only the base layer is transmitted on the receiving terminal.
- the reproduction speed magnification exceeds 2.0 times
- (Bb * 2.0) + (Be1 * 2) 0.0) 4.0 Mbps, which exceeds the usable network bandwidth Ball.
- transmission of the first enhancement layer is not performed, and transmission at 2.0 Mbps is determined only for the base layer while leaving a free bandwidth.
- the reproduction speed magnification exceeds 3.0
- the base layer read bit rate exceeds the usable network bandwidth Ball.
- an error to the fast forward request is returned.
- This error is notified to the request source by the reproduction speed change request receiving means 108. It is also possible to use a process of performing frame thinning without returning an error and sending a fast-forward video exceeding 3.0 times.
- the network bandwidth of the network 300 may be separately measured and the value used.
- the playback speed changing means 107 sets the new reading bit rate for each layer calculated in the above procedure in the content reading means 102 during fast forward playback. This increases the supply rate of data necessary for fast-forward playback.
- the playback speed changing means 107 changes the clock rate of the RTP time stamp during fast forward playback.
- a rate of 90 kHz is used, but the clock rate is changed to a value obtained by dividing the clock rate by the fast-forward magnification in accordance with the fast-forward magnification.
- 90 kHz / 1.5 60 kHz
- 90 kHz / 2.0 45 kHz
- the fast feed magnification is 2.5 times.
- Is 90 kHz / 2.5 36 kHz
- when the rapid feed magnification 3.0
- 90 kHz / 3.0 30 kHz.
- the playback speed changing unit 107 sets the clock rate of the new RTP time stamp thus changed in the time information setting unit 104 during fast forward playback.
- the video receiving apparatus 200 can display fast-forward playback video by performing decoding and playback according to the RTP time stamp.
- the reproduction speed changing unit 107 sets the read bit rate and the clock rate, but they may be separated into different units.
- FIG. 6 is a functional block diagram showing the configuration of the video reception device in the present embodiment.
- the video receiving apparatus 200 includes a receiving unit 201, a buffering unit 202, a depacketizing unit 203, a decoding unit 204, a display unit 205, a playback speed change instruction input unit 206, and a playback speed change request unit 207.
- the Each of these means operates as follows.
- the receiving means 201 is means for receiving a video stream sent from the video distribution apparatus 100 connected via the network 300.
- the receiving unit 201 connected to the Internet performs a process of receiving an RTP packet using a socket API.
- a packet arriving at the receiving means 201 is immediately sent to the buffering means 202.
- Buffering means 202 is means for buffering the received video stream in preparation for playback processing. By performing buffering, it is possible to reproduce video at a fixed frame rate that is not affected by jitter on the network.
- the timing for buffering the packet is when the RTP packet arrives at the receiving means 201.
- the buffered packet is taken out by the depacketizing means 203.
- the depacketizing unit 203 can take out one or more RTP packets from the buffering unit 202. Further, the RTP time stamp of each buffered RTP packet can be acquired in order to determine whether the decoding unit 204 performs the decoding process.
- the depacketizing unit 203 is a unit that receives an instruction from the decoding unit 204, extracts an RTP packet from the buffering unit 202, and acquires a video stream.
- the depacketizing unit 203 receives time information to be decoded from the decoding unit 204 and performs processing for extracting the RTP packet from the buffering unit 202.
- One or more RTP packets whose RTP timestamp value is equal to or less than the time information to be decoded are extracted, and RTP payloads are extracted and combined in the order of RTP sequence numbers. This combined RTP payload is H.264.
- the H.264 / SVC elementary stream is passed to the decoding unit 204.
- the decoding means 204 is H.264. This is a means for decoding a H.264 / SVC stream and obtaining a bitmap video.
- the decoding unit 204 includes a system clock therein and autonomously performs a packet extraction instruction, a depacketization instruction, and a decoding process.
- the system clock is a counter that advances at a clock rate of 90 kHz, and the value of this counter becomes time information that identifies the RTP packet to be decoded.
- the decoding unit 204 performs the decoding process when there is an RTP packet having an RTP time stamp equal to or less than the value of the system clock in the buffering unit 202. Then, the decoding means 204 passes the system clock value to the depacketizing means 203, and the H.D. H.264 / SVC elementary stream is acquired.
- nal_unit_type that is an identifier for identifying each layer.
- the decoding means 204 identifies the arriving layer in units of NAL units by constantly checking this nal_unit_type.
- the decoding unit 204 confirms whether or not there are extension layers in order from the base layer to the upper layer. Thereafter, the lowest extension layer is specified from the non-existing hierarchies, and the extension layer and the base layer below the hierarchy are decoded.
- the decoding unit 204 performs only the decoding of the base layer.
- the enhancement layer of the second hierarchy is not transmitted, only the base layer and the first enhancement layer are decoded as described above.
- decoding can be continued, and the load on the processor can be reduced as compared with the case where all layers are decoded during fast-forward playback.
- the bitmap data obtained as a result of decoding is immediately sent to the display means 205.
- the inputted H.P. The extension layer that exists continuously from the basic layer of the H.264 / SVC elementary stream can be decoded and is described as a method that is subject to decoding.
- Display means 205 is means for displaying bitmap data on the screen.
- the bitmap data output from the decoding means 205 is received and displayed on a video display device that is mounted on the video receiving terminal 200 or connected to the video receiving terminal 200. In this embodiment, the description regarding the video display device is omitted.
- the display unit 205 starts display at the timing when the output of the bitmap data is received from the decoding unit 204, and continues to display the bitmap data until the next bitmap data is received. As a result, even when the decoding unit 204 does not output the decoded video, it is possible to continue displaying the video until the next decoding is normally completed, and to suppress deterioration in the quality of the reproduced video.
- the playback speed change instruction input means 206 is a means for receiving a playback speed change request from the user. Possible ways of accepting include pressing the fast-forward button, dragging the slide bar with the mouse, and inputting the playback magnification using the keys.
- the input reproduction speed change request is converted into a reproduction speed magnification and sent to the reproduction speed change request means 207.
- the playback speed change request unit 207 is a unit that requests the video distribution apparatus 100 connected via the network 300 to change the playback speed.
- processing for sending a PLAY method with a Scale header added is performed using the RTSP protocol.
- a process of receiving a response from the video distribution apparatus 100 as to whether or not fast-forwarding is possible is performed.
- the change in the playback speed is only forward-forward playback in the forward direction, but it may be a speed change during reverse playback.
- the video distribution device 100 and the video reception device 200 are configured to be connected via the network 300. However, as shown in FIG. 7, the video distribution device 100 and the video reception device 200 are arranged inside the video reproduction device 700. A configuration that does not use a simple network is also possible.
- FIG. 8 is a flowchart showing the flow of the reproduction speed change process of the video distribution apparatus in the present embodiment, and shows the process when the reproduction speed change means 107 of the video distribution apparatus 100 performs n-times fast forward. is there. Note that error processing is omitted in the flowchart of FIG.
- the playback speed changing means 107 receives an n-times fast-forward command instruction from the video playback speed change request accepting means 108 (step S801).
- the playback speed changing unit 107 acquires the bit rate information of all layers of the content from the content information managing unit 106 (step S802).
- the playback speed changing unit 107 determines an available network bandwidth (step S803). This value may be designated by the user or may be the sum of the bit rates of all layers. Alternatively, it may be determined from the result of measuring the available network bandwidth of the currently connected network 300.
- the bit rate for reading each layer is calculated for fast-forward playback.
- the read bit rate set at the time of fast forward reproduction is called a fast forward bit rate.
- the value of the fast-forward bit rate of each layer is set to 0 for initialization (step S804).
- the lowest layer is selected as a layer to be calculated.
- the lowest layer in this case is the base layer (step S805).
- step S806 a value obtained by multiplying the bit rate during normal playback of the calculation target layer by n is stored as the fast-forward bit rate of the target layer (step S806). Then, the sum of the fast-forward bit rates of all layers is obtained (step S807).
- the sum of the fast-forward bit rates of all layers represents the network bandwidth used during fast-forward playback.
- step S808 it is determined whether the sum of the fast-forward bit rates of all layers calculated above does not exceed the pre-determined usable network bandwidth.
- step S814 the layer to be calculated is changed to the next higher layer. For example, if the current calculation target layer is a basic layer, the first enhancement layer is set as a new calculation target, and if the current calculation target layer is the first enhancement layer, the second enhancement layer is set as a new calculation target. To do. Thereafter, the process proceeds to step S806, and the fast-forward bit rate of the next layer is obtained.
- step S808 / YES if the total fast-forward bit rate exceeds the usable network bandwidth (step S808 / YES), if the fast-forward playback is performed as it is, delivery exceeding the designated usable network bandwidth is performed. If it is not allowed to exceed the bandwidth, it is not possible to perform the process of reading the layer that is the current calculation target. Therefore, the fast-forward bit rate of the calculation target layer is changed to 0 (step S809). Since the number of transmission layers cannot be increased any more, the subsequent setting change processing is performed.
- the reading process is temporarily stopped (step S810), and the fast-forward bit rate of each layer is designated to the content reading unit 102. (Step S811).
- a layer whose fast-forward bit rate is set to 0 means to skip without performing read processing.
- the clock rate of the time information setting means 104 is changed to 1 / n (step S812).
- step S813 the reading process by the content reading unit 102 is resumed. Thereafter, the video distribution apparatus 100 performs n times fast-forward playback.
- the first effect is that fast-forward playback can be realized without increasing the transmission bit rate.
- the reason is that only a part of the stream including the base layer is transmitted at a rate higher than normal playback.
- the video receiving apparatus can perform reproduction without transmitting some or all of the enhancement layers.
- By allocating the bandwidth occupied by the extended layer whose transmission has been stopped to increase the transmission rate of the base layer it is possible to transmit a basic layer stream that exceeds the normal playback rate without increasing the overall network usage bandwidth. This is because it becomes possible.
- the second effect is that the decoding load of the receiving apparatus can be reduced during fast-forward playback.
- the video receiving apparatus performs decoding processing at or above the normal playback rate during fast-forward playback, but the stream sent out by the distribution apparatus is not the entire stream but a stream in which part or all of the enhancement layer does not exist.
- the video receiving apparatus does not need to perform an extension layer decoding process that has not been transmitted during fast-forward playback, and can reduce the decoding load as compared with the existing method of decoding all layers.
- the third effect is that a smooth video display can be realized during fast-forward playback.
- the video distribution apparatus realizes a reduction in the bit rate during fast-forward playback by transmitting only the base layer or the base layer and a part of the extension layers instead of performing the frame-by-frame thinning process. For this reason, the video receiving apparatus can display all frames of the content during fast-forward playback.
- the present invention can be applied to uses such as video distribution devices such as a VoD server and nDVR, and video playback devices such as an HDD recorder.
- the present invention can also be implemented as a program for causing a video distribution device or the like to execute the operation as described above, and a recording medium recording the program.
- the program executed by the video distribution apparatus has a module configuration including the above-described units (reproduction speed changing means, content reading means, time information setting means, etc.) Use to realize concrete means. That is, when the computer (CPU) of the video distribution apparatus reads out and executes a program from a predetermined recording medium, the above-described units are loaded onto the main storage device, and a reproduction speed changing unit, a content reading unit, a time information setting unit, and the like are loaded. Generated on main storage.
- the program executed by the video distribution apparatus according to the present embodiment may be configured to be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Further, the program may be provided or distributed via a network such as the Internet.
- the program is a file in an installable or executable format, such as a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, DVD, non-volatile memory card, etc. It may be configured to be provided by being recorded on a computer-readable recording medium. Further, the program may be provided by being incorporated in advance in a ROM or the like.
- the program code itself read from the recording medium or loaded and executed through the communication line realizes the functions of the above-described embodiment.
- the recording medium which recorded the program code comprises this invention.
- Video delivery apparatus 101
- Content storage means 102
- Packetizing means 104
- Time information setting means 105
- Sending means 106
- Playback speed changing means 108
- Playback speed change request receiving means 200
- Video receiving apparatus 201
- Receiving means 202
- Buffering means 203
- Depacketizing means 204
- Decoding means 205
- Display means 206
- Playback speed change instruction input means 207
- Playback speed change request means 300
- Network 700 Video playback device
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
Description
101 コンテンツ記憶手段
102 コンテンツ読み出し手段
103 パケタイズ手段
104 時刻情報設定手段
105 送出手段
106 コンテンツ情報管理
107 再生速度変更手段
108 再生速度変更要求受付手段
200 映像受信装置
201 受信手段
202 バッファリング手段
203 デパケタイズ手段
204 デコード手段
205 表示手段
206 再生速度変更指示入力手段
207 再生速度変更要求手段
300 ネットワーク
700 映像再生装置
Claims (35)
- 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを配信する映像配信装置であって、
前記映像コンテンツ中の前記基本信号と前記拡張信号とをそれぞれ独立のビットレートで読み出すコンテンツ読み出し手段と、
前記コンテンツ読み出し手段に各信号別の読み出しビットレートを指定してコンテンツ再生速度を変更する再生速度変更手段と、
を備えることを特徴とする映像配信装置。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理手段と、
前記再生速度変更手段に再生フレームレートの変更を指示する再生速度変更要求受付手段と、を備え、
前記再生速度変更手段は、前記コンテンツ情報管理手段から取得した前記ビットレート情報を用い、前記再生速度変更要求受付手段から指示された再生フレームレートを実現するために映像コンテンツを読み出すための各信号別の読み出しビットレートを決定することを特徴とする請求項1に記載の映像配信装置。 - 前記コンテンツ読み出し手段が読み出した前記映像コンテンツに時刻情報を付加する時刻情報設定手段を備え、
前記再生速度変更手段は、再生速度変更の決定を行った場合、前記時刻情報設定手段に対して前記時刻情報のクロックレートの変更を指示することを特徴とする請求項1又は2に記載の映像配信装置。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理手段と、
前記再生速度変更手段に再生フレームレートの変更を指示する再生速度変更要求受付手段と、を備え、
前記再生速度変更手段は、前記再生速度変更要求受付手段から再生フレームレートの変更指示を取得し、前記コンテンツ情報管理手段から全信号のビットレートを取得し、ネットワーク使用可能帯域幅を決定し、前記基本信号から前記拡張信号の順に各信号の読み出しビットレートを変更する過程で、変更された各信号の読み出しビットレートの合計が前記ネットワーク使用可能帯域幅を超えないように各信号の読み出しビットレートの変更を停止し、該変更をしなかった階層以上の拡張信号の読み出しを停止する指示を行うことを特徴とする請求項1から3のいずれか1項に記載の映像配信装置。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理手段と、
前記再生速度変更手段に再生フレームレートの変更を指示する再生速度変更要求受付手段と、を備え、
前記再生速度変更手段は、前記コンテンツ情報管理手段から前記ビットレート情報として各信号のビットレートを取得し、前記再生速度変更要求受付手段から再生フレームレートの変更指示として映像再生フレームレートの倍率を取得し、前記各信号のビットレートと前記映像再生フレームレートの倍率との積を算出して読み出しビットレートの変更を行うことを特徴とする請求項1から4のいずれか1項に記載の映像配信装置。 - 前記コンテンツ読み出し手段が読み出した前記映像コンテンツに時刻情報を付加する時刻情報設定手段を備え、
前記再生速度変更手段は、再生速度変更の決定を行った場合、前記時刻情報設定手段に対して、前記時刻情報のクロックレートを再生速度の変更倍率で除した値に変更する指示を行うことを特徴とする請求項1から5のいずれか1項に記載の映像配信装置。 - 前記再生速度変更手段に再生フレームレートの変更を指示する再生速度変更要求受付手段を備え、
前記再生速度変更要求受付手段は、ネットワーク上の映像受信装置から再生速度変更要求を受け付けることを特徴とする請求項1から6のいずれか1項に記載の映像配信装置。 - 前記映像コンテンツは、H.264/SVCコーデックでエンコードされたコンテンツであり、前記基本信号は、H.264/SVCの基本レイヤであり、前記拡張信号は、H.264/SVCの拡張レイヤであることを特徴とする請求項1から7のいずれか1項に記載の映像配信装置。
- 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを映像配信装置から受信する映像受信装置であって、
前記映像コンテンツ中の前記基本信号と前記拡張信号とをそれぞれ独立のビットレートで読み出すとともに各信号別の読み出しビットレートを指定して前記映像コンテンツの再生速度を変更する前記映像配信装置に対して、前記映像コンテンツの再生速度の倍率変更要求を送出する再生速度変更要求手段と、
前記映像配信装置から受信した前記映像コンテンツに付加された時刻情報に従って映像デコード処理を実施するデコード手段と、
を備えることを特徴とする映像受信装置。 - 前記デコード手段は、入力される映像コンテンツ中に含まれる信号識別子を読み出して信号の種別を識別し、前記識別を繰り返して前記映像コンテンツ中に含まれない前記拡張信号を特定し、前記映像コンテンツ中に含まれない前記拡張信号の中で最も下位の階層を特定し、前記特定した最も下位の階層より下の階層の前記拡張信号と前記基本信号とについてデコード処理を行うことを特徴とする請求項9に記載の映像受信装置。
- 前記デコード手段は、入力される映像コンテンツ中に含まれる前記拡張信号のうち、デコード処理の対象とする前記拡張信号の階層をユーザからの指示により変更することを特徴とする請求項9又は10に記載の映像受信装置。
- 前記映像コンテンツは、H.264/SVCコーデックでエンコードされたコンテンツであり、前記基本信号は、H.264/SVCの基本レイヤであり、前記拡張信号は、H.264/SVCの拡張レイヤであることを特徴とする請求項9から11のいずれか1項に記載の映像受信装置。
- 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを配信する映像配信装置と、前記映像配信装置により配信された前記映像コンテンツを受信する映像受信装置と、を備える映像配信システムであって、
前記映像配信装置は、
前記映像コンテンツ中の前記基本信号と前記拡張信号とをそれぞれ独立のビットレートで読み出すコンテンツ読み出し手段と、
前記コンテンツ読み出し手段に各信号別の読み出しビットレートを指定してコンテンツ再生速度を変更する再生速度変更手段と、
を備え、
前記映像受信装置は、
前記映像コンテンツの再生速度の倍率変更要求を前記映像配信装置に送出する再生速度変更要求手段と、
前記映像配信装置から受信した前記映像コンテンツに付加された時刻情報に従って映像デコード処理を実施するデコード手段と、
を備えることを特徴とする映像配信システム。 - 前記映像配信装置は、
前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理手段と、
前記再生速度変更手段に再生フレームレートの変更を指示する再生速度変更要求受付手段と、を備え、
前記再生速度変更手段は、前記コンテンツ情報管理手段から取得した前記ビットレート情報を用い、前記再生速度変更要求受付手段から指示された再生フレームレートを実現するために映像コンテンツを読み出すための各信号別の読み出しビットレートを決定することを特徴とする請求項13に記載の映像配信システム。 - 前記映像配信装置は、
前記コンテンツ読み出し手段が読み出した前記映像コンテンツに時刻情報を付加する時刻情報設定手段を備え、
前記再生速度変更手段は、再生速度変更の決定を行った場合、前記時刻情報設定手段に対して前記時刻情報のクロックレートの変更を指示することを特徴とする請求項13又は14に記載の映像配信システム。 - 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを配信する映像配信装置と、前記映像配信装置により配信された前記映像コンテンツを受信する映像受信装置と、を備え、前記両装置がバス接続されて構成される映像再生装置であって、
前記映像配信装置は、
前記映像コンテンツ中の前記基本信号と前記拡張信号とをそれぞれ独立のビットレートで読み出すコンテンツ読み出し手段と、
前記コンテンツ読み出し手段に各信号別の読み出しビットレートを指定してコンテンツ再生速度を変更する再生速度変更手段と、
を備え、
前記映像受信装置は、
前記映像コンテンツの再生速度の倍率変更要求を前記映像配信装置に送出する再生速度変更要求手段と、
前記映像配信装置から受信した前記映像コンテンツに付加された時刻情報に従って映像デコード処理を実施するデコード手段と、
を備えることを特徴とする映像再生装置。 - 前記映像配信装置は、
前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理手段と、
前記再生速度変更手段に再生フレームレートの変更を指示する再生速度変更要求受付手段と、を備え、
前記再生速度変更手段は、前記コンテンツ情報管理手段から取得した前記ビットレート情報を用い、前記再生速度変更要求受付手段から指示された再生フレームレートを実現するために映像コンテンツを読み出すための各信号別の読み出しビットレートを決定することを特徴とする請求項16に記載の映像再生装置。 - 前記映像配信装置は、
前記コンテンツ読み出し手段が読み出した前記映像コンテンツに時刻情報を付加する時刻情報設定手段を備え、
前記再生速度変更手段は、再生速度変更の決定を行った場合、前記時刻情報設定手段に対して前記時刻情報のクロックレートの変更を指示することを特徴とする請求項16又は17に記載の映像再生装置。 - 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを配信する映像配信方法であって、
前記映像コンテンツ中の前記基本信号と前記拡張信号について、各信号別の読み出しビットレートを指定してコンテンツ再生速度を変更する再生速度変更ステップと、
前記再生速度変更ステップにより指定されたビットレートに従って、各信号をそれぞれ独立のビットレートで読み出すコンテンツ読み出しステップと、
を有することを特徴とする映像配信方法。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理ステップと、
前記再生速度変更ステップによる再生速度変更に際して、再生フレームレートの変更を指示する再生速度変更要求受付ステップと、を有し、
前記再生速度変更ステップは、前記コンテンツ情報管理ステップにより管理される前記ビットレート情報を取得して用い、前記再生速度変更要求受付ステップにより指示された再生フレームレートを実現するために映像コンテンツを読み出すための各信号別の読み出しビットレートを決定することを特徴とする請求項19に記載の映像配信方法。 - 前記コンテンツ読み出しステップにより読み出された前記映像コンテンツに時刻情報を付加する時刻情報設定ステップを有し、
前記再生速度変更ステップは、再生速度変更の決定を行った場合、前記時刻情報設定ステップによる時刻情報付加で用いられる前記時刻情報のクロックレートの変更することを特徴とする請求項19又は20に記載の映像配信方法。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理ステップと、
前記再生速度変更ステップによる再生速度変更に際して、再生フレームレートの変更を指示する再生速度変更要求受付ステップと、を有し、
前記再生速度変更ステップは、再生フレームレートの変更指示を取得するステップと、前記コンテンツ情報管理ステップにより管理される全信号のビットレートを取得するステップと、ネットワーク使用可能帯域幅を決定するステップと、前記基本信号から前記拡張信号の順に各信号の読み出しビットレートを変更する過程で、変更された各信号の読み出しビットレートの合計が前記ネットワーク使用可能帯域幅を超えないように各信号の読み出しビットレートの変更を停止するステップと、前記読み出しビットレートの変更をしなかった階層以上の拡張信号の読み出しを停止する指示を行うステップと、を有することを特徴とする請求項19から21のいずれか1項に記載の映像配信方法。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理ステップと、
前記再生速度変更ステップによる再生速度変更に際して、再生フレームレートの変更を指示する再生速度変更要求受付ステップと、を有し、
前記再生速度変更ステップは、
前記コンテンツ情報管理ステップにより管理された前記ビットレート情報として各信号のビットレートを取得するステップと、再生フレームレートの変更指示として映像再生フレームレートの倍率を取得するステップと、前記各信号のビットレートと前記映像再生フレームレートの倍率との積を算出して読み出しビットレートの変更を行うステップと、を有することを特徴とする請求項19から22のいずれか1項に記載の映像配信方法。 - 前記コンテンツ読み出しステップにより読み出された前記映像コンテンツに時刻情報を付加する時刻情報設定ステップを有し、
前記再生速度変更ステップは、再生速度変更の決定を行った場合、前記時刻情報設定ステップによる時刻情報付加で用いられる前記時刻情報のクロックレートを再生速度の変更倍率で除した値に変更することを特徴とする請求項19から23のいずれか1項に記載の映像配信方法。 - 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを映像配信装置から受信する映像受信方法であって、
前記映像コンテンツ中の前記基本信号と前記拡張信号とをそれぞれ独立のビットレートで読み出すとともに各信号別の読み出しビットレートを指定して前記映像コンテンツの再生速度を変更する前記映像配信装置に対して、前記映像コンテンツの再生速度の倍率変更要求を送出する再生速度変更要求ステップと、
前記映像配信装置から受信した前記映像コンテンツに付加された時刻情報に従って映像デコード処理を実施するデコードステップと、
を有することを特徴とする映像受信方法。 - 前記デコードステップは、入力される映像コンテンツ中に含まれる信号識別子を読み出して信号の種別を識別するステップと、前記識別を繰り返して前記映像コンテンツ中に含まれない前記拡張信号を特定するステップと、前記映像コンテンツ中に含まれない前記拡張信号の中で最も下位の階層を特定するステップと、前記特定した最も下位の階層より下の階層の前記拡張信号と前記基本信号とについてデコード処理を行うステップと、を有することを特徴とする請求項25に記載の映像受信方法。
- 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを配信する映像配信装置に用いられるプログラムであって、
コンピュータに、
前記映像コンテンツ中の前記基本信号と前記拡張信号について、各信号別の読み出しビットレートを指定してコンテンツ再生速度を変更する再生速度変更機能と、
前記再生速度変更機能により指定されたビットレートに従って、各信号をそれぞれ独立のビットレートで読み出すコンテンツ読み出し機能と、
を実現させることを特徴とするプログラム。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理機能と、
前記再生速度変更機能による再生速度変更に際して、再生フレームレートの変更を指示する再生速度変更要求受付機能と、をコンピュータに実現させ、
前記再生速度変更機能は、前記コンテンツ情報管理機能により管理された前記ビットレート情報を取得して用い、前記再生速度変更要求受付ステップにより指示された再生フレームレートを実現するために映像コンテンツを読み出すための各信号別の読み出しビットレートを決定することを特徴とする請求項27に記載のプログラム。 - 前記コンテンツ読み出し機能により読み出された前記映像コンテンツに時刻情報を付加する時刻情報設定機能をコンピュータに実現させ、
前記再生速度変更機能は、再生速度変更の決定を行った場合、前記時刻情報設定機能による時刻情報付加で用いられる前記時刻情報のクロックレートの変更することを特徴とする請求項27又は28に記載のプログラム。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理機能と、
前記再生速度変更機能による再生速度変更に際して、再生フレームレートの変更を指示する再生速度変更要求受付機能と、をコンピュータに実現させ、
前記再生速度変更機能は、前記再生速度変更要求受付機能による再生フレームレートの変更指示を取得し、前記コンテンツ情報管理手段により管理された全信号のビットレートを取得し、ネットワーク使用可能帯域幅を決定し、前記基本信号から前記拡張信号の順に各信号の読み出しビットレートを変更する過程で、変更された各信号の読み出しビットレートの合計が前記ネットワーク使用可能帯域幅を超えないように各信号の読み出しビットレートの変更を停止し、前記読み出しビットレートの変更をしなかった階層以上の拡張信号の読み出しを停止する指示を行うことを特徴とする請求項27から29のいずれか1項に記載のプログラム。 - 前記映像コンテンツ中の前記基本信号及び前記拡張信号のビットレート情報を管理するコンテンツ情報管理機能と、
前記再生速度変更機能による再生速度変更に際して、再生フレームレートの変更を指示する再生速度変更要求受付機能と、をコンピュータに実現させ、
前記再生速度変更機能は、前記コンテンツ情報管理手段により管理された前記ビットレート情報として各信号のビットレートを取得し、前記再生速度変更要求受付機能による再生フレームレートの変更指示として映像再生フレームレートの倍率を取得し、前記各信号のビットレートと前記映像再生フレームレートの倍率との積を算出して読み出しビットレートの変更を行うことを特徴とする請求項27から30のいずれか1項に記載のプログラム。 - 前記コンテンツ読み出し機能により読み出された前記映像コンテンツに時刻情報を付加する時刻情報設定機能をコンピュータに実現させ、
前記再生速度変更機能は、再生速度変更の決定を行ったときに、前記時刻情報設定機能による時刻情報付加で用いられる前記時刻情報のクロックレートを再生速度の変更倍率で除した値に変更することを特徴とする請求項27から31のいずれか1項に記載のプログラム。 - 階層状に構成された基本信号及び1以上の拡張信号を含む映像コンテンツを映像配信装置から受信する映像受信装置で用いられるプログラムであって、
コンピュータに、
前記映像コンテンツ中の前記基本信号と前記拡張信号とをそれぞれ独立のビットレートで読み出すとともに各信号別の読み出しビットレートを指定して前記映像コンテンツの再生速度を変更する前記映像配信装置に対して、前記映像コンテンツの再生速度の倍率変更要求を送出する再生速度変更要求機能と、
前記映像配信装置から受信した前記映像コンテンツに付加された時刻情報に従って映像デコード処理を実施するデコード機能と、
を実現させることを特徴とするプログラム。 - 前記デコード機能は、入力される映像コンテンツ中に含まれる信号識別子を読み出して信号の種別を識別し、該識別を繰り返して前記映像コンテンツ中に含まれない前記拡張信号を特定し、前記映像コンテンツ中に含まれない前記拡張信号の中で最も下位の階層を特定し、前記特定した最も下位の階層より下の階層の前記拡張信号と前記基本信号とについてデコード処理を行うことを特徴とする請求項33に記載のプログラム。
- 請求項27から34のいずれか1項に記載のプログラムを記録しコンピュータ読み取り可能なことを特徴とする記録媒体。
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