WO2020138567A1 - Appareil, système, et procédé de diffusion en continu de contenu - Google Patents

Appareil, système, et procédé de diffusion en continu de contenu Download PDF

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Publication number
WO2020138567A1
WO2020138567A1 PCT/KR2018/016886 KR2018016886W WO2020138567A1 WO 2020138567 A1 WO2020138567 A1 WO 2020138567A1 KR 2018016886 W KR2018016886 W KR 2018016886W WO 2020138567 A1 WO2020138567 A1 WO 2020138567A1
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rendition
renditions
segment
user terminal
content
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PCT/KR2018/016886
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English (en)
Korean (ko)
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김태현
이영환
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(주)아이앤아이소프트
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Publication of WO2020138567A1 publication Critical patent/WO2020138567A1/fr

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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
    • H04N21/23439—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 for generating different versions
    • 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
    • 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
    • H04N21/234381—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 altering the temporal resolution, e.g. decreasing the frame rate by frame skipping
    • 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
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
    • 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
    • H04N21/239—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
    • 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
    • H04N21/239—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
    • H04N21/2393—Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests involving handling client requests

Definitions

  • the present specification relates to an apparatus, system, and method for transmitting content data.
  • the content provider may transmit content data to the user terminal through the replication server. That is, as one of the methods of transmitting the content data, there is a method in which the content provider pre-stores at least some content in the replication server, and the user terminal receives the pre-stored content data from the replication server.
  • the content delivery method through the replication server includes a CDN (Content Delivery Network) service.
  • the replication server can be, for example, a cache server, a ghost server, an edge server, or a mirror server.
  • the CDN service differs according to the method of each CDN service policy, but among a plurality of CDN replication servers, a CDN replication server closest to the location of a user terminal requesting content data or a CDN replication server having an optimal access path
  • the access information is transmitted to the user terminal, and the user terminal can receive content data in a streaming or download method from the corresponding CDN replication server.
  • CDN service providers encode content into multiple renditions with different bitrates and provide renditions that take into account the network environment of each user terminal in order to provide seamless service of content data transmission.
  • ABR Adaptive Bitrate
  • adaptive bitrate that provides any one of a plurality of renditions having different bit rates for the same content according to the network conditions of the terminal
  • ABR adaptive bitrate
  • the video streaming method of the edge server is a plurality of renditions having different bit rates of the same video content, each rendition includes a plurality of segments having different resolutions, and each segment of the same rendition
  • the first rend of the plurality of renditions in response to the operation of storing the plurality of renditions having the same encoding quality parameter value range, the operation of receiving the first request of the user terminal, and the first request of the user terminal. And transmitting the first segment of the partition.
  • the video streaming method of the content server is an operation of generating or receiving a manifest file based on a plurality of renditions having different bit rates of the same video content, the plurality of contents from a CDN (Contents Delivery Network) device And receiving a data transmission request for at least one of the renditions and transmitting data for the requested rendition to the CDN device, wherein each rendition of the plurality of renditions has a different resolution. It includes a plurality of segments, and a plurality of segments included in the same rendition among the plurality of renditions may have the same range of encoding quality parameter values.
  • the edge server is a plurality of renditions having different bit rates of the same video content, each rendition includes a plurality of segments with different resolutions, and each segment of the same rendition is the same encoding quality parameter.
  • a storage unit that stores the plurality of renditions having a range of values, a communication unit that receives a first transmission request for the video content from a user terminal and transmits a response thereto, and a first transmission of the user terminal through the communication unit It may include a control unit for controlling to transmit the first segment of the first rendition of the plurality of renditions in response to the request.
  • the CDN system is a first server that stores a first rendition among a plurality of renditions having different bit rates of the first video content and transmits at least one segment of the first rendition to a user terminal. And a second server storing a second rendition among a plurality of renditions having different bit rates of the first video content, and transmitting at least one segment of the second rendition to the user terminal,
  • the first rendition includes a plurality of segments having different resolutions
  • the second rendition includes a plurality of segments having different resolutions
  • the first rendition and the second rendition are the same encoding. It may have a quality parameter value.
  • the content server is a packaging unit for generating or storing a manifest file based on a plurality of renditions having different bit rates of the same video content, and among the plurality of renditions from a content delivery network (CDN) device It includes a communication unit for receiving a data transmission request for at least one rendition, and a control unit for controlling to transmit data for the requested rendition to the CDN device, and each rendition among the plurality of renditions has a different resolution.
  • a plurality of segments included, and a plurality of segments included in the same rendition among the plurality of renditions may have the same range of encoding quality parameter values.
  • an adaptive bitrate (ABR) technology capable of transmitting a rendition suitable for a network situation of a user terminal can be provided, and an adaptive bitrate technology without deterioration of image quality experienced by a user Can provide
  • FIG. 1 schematically illustrates an embodiment including a content delivery system.
  • FIG. 2 schematically illustrates an embodiment including a content delivery system.
  • FIG. 3 schematically illustrates an embodiment of a plurality of renditions having different bit rates.
  • FIG. 4 schematically shows an embodiment of generating a plurality of renditions having different bit rates.
  • FIG 5 schematically shows the configuration of an edge server.
  • FIG. 6 schematically shows the configuration of a content server.
  • the technology disclosed herein can be applied to content delivery devices and related devices.
  • the technology disclosed in this specification is not limited thereto, and may be applied to all electronic devices and methods to which the technical spirit of the technology can be applied.
  • first and second used in the present specification may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.
  • first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may also be referred to as a first component.
  • the content delivery system may include a content delivery network (CDN) 120 including an edge server and an origin server 110.
  • CDN content delivery network
  • the CDN 120 may have a hierarchical structure composed of caching nodes for storing and transmitting copies of content, and an edge server that transmits content to high-tier caching nodes and user terminals (Can be referred to as a cache server, ghost server, edge server, or mirror server.).
  • the origin server 110 exists outside the CDN 120, the origin server 110 is not excluded from operating as a device of the CDN 120.
  • the adaptive content may be distributed to the user terminal in a Real Time Transport Protocol / Real Time Streaming Protocol (RTP/RTSP), Real Time Message Protocol (RTMP) or hypertext transfer protocol (HTTP) method, and the user terminal
  • RTP/RTSP Real Time Transport Protocol / Real Time Streaming Protocol
  • RTMP Real Time Message Protocol
  • HTTP hypertext transfer protocol
  • the origin server 110 or a separate CDN device may periodically request a manifest file to obtain a list of content that can be requested.
  • the origin server 110 may receive a content original (mezzanine file) and encode it into a bitstream or package the encoded bitstream.
  • the origin server 110 may be referred to as an encoder or packaging device.
  • the origin server 110 may receive a pre-recorded content such as a live broadcast of a sports broadcast, a live concert broadcast, a TV program, a movie, or advertisement content, and encode or package it.
  • a pre-recorded content such as a live broadcast of a sports broadcast, a live concert broadcast, a TV program, a movie, or advertisement content
  • the origin server 110 may receive already encoded or packaged content and transmit it to the CDN 120, and in the specification, the description that the origin server 110 is encoded or packaged in the specification is already encoded or packaged. It includes the concept of receiving content and transmitting it to the CDN 120.
  • the origin server 110 encodes, packages the contents into a plurality of renditions having different bitrates, or receives contents encoded or packaged at different bitrates and transmits the contents to the CDN 120 Can.
  • Each bitstream encoded or packaged based on various settings or environments may be called a rendition.
  • a plurality of renditions having different bit rates may include renditions encoded in upper and lower bit rates, and the number of renditions is not particularly limited.
  • the origin server 110 may simultaneously encode or package a plurality of renditions and transmit them to the CDN device, or transmit one rendition according to the request of the CDN device.
  • Each rendition of the content includes at least one segment (which may be called a chunk), and each segment may include at least one group of pictures (GOP).
  • a segment is a part of a bitstream in which content is encoded, and each segment can be decoded and reproduced in a user terminal or stored in a user terminal (for a temporary or period).
  • the origin server 110 may generate a manifest file for a plurality of renditions or receive it and transmit it to a CDN device.
  • the manifest file is generated by an upper layer caching node in the CDN 120 or Can provide.
  • the manifest file may include a connection (request) path or related metadata of a segment or other related data of each rendition of a content bitstream requestable by the user terminal 130.
  • the origin server 110 or the upper layer caching node may generate a manifest file including a requestable access path for a plurality of renditions, and the upper layer caching node or other node of the CDN provides it. Can receive
  • the manifest file may be based on a plurality of renditions having different bit rates, each rendition may consist of a plurality of segments, and some of the segments of one rendition may have different segments It has a resolution, but may have the same encoding quality parameter value (or a range of encoding quality parameter values).
  • the encoding quality parameter is a parameter that affects the image quality of the image itself during encoding, and may be a QP (Quantization Parameter) and an RF (Rate Factor). This will be described in detail below.
  • CDN 120 refers to a system composed of a network of computing devices (servers, etc.), each computing device of CDN 120 may be referred to as a node, and CDN 120 is a bitstreamed content Renditions can be saved or transferred.
  • the CDN 120 may transmit a bitstreamed rendition of content through a broadband network between each node, and the network may be, for example, a wireless network, a wired network, a public network such as the Internet, a private network, or a mobile communication network.
  • GSM Global system for mobile communication network
  • GPRS general packet radio network
  • LAN local area network
  • WAN wide area network
  • private network personal area network
  • Bluetooth Wi-Fi Direct
  • Near Field communication UltraWide band
  • the user terminal 130 may request a content transmission to the edge server based on the content access information received from the origin server 110 or a separate device (CDN DNS server, content server, manifest server) through the network. .
  • the user terminal 130 of the embodiment disclosed herein includes a personal computer (PC), a tablet computer, a smart phone, and the like.
  • the content delivery system may include a CDN 220 including edge servers 223 and 224 and an origin server 210. 2 does not exclude that the origin server 210 operates as a device of the CDN 220.
  • the origin server 210 may operate as an active stream server, and a request based on a protocol based on RTP/RTSP, RTMP or HTTP for content data from the user terminal 230 is CDN 220. It may be transmitted through or directly to the origin server 210.
  • the origin server 210 sends the bitstreamed rendition and manifest file of the content to the intermediate layer caching nodes 221, 222 or the edge servers 223, 224 at the request of the CDN device, or in advance. Can transmit.
  • the CDN device (middle layer caching nodes 221 and 222 or the edge servers 223 and 224) is sent to the upper layer caching node or origin server 210 when requesting the content of the user terminal 230 or any rendition of the content. After requesting all or a plurality of renditions for the content and receiving the renditions, the contents may be stored in a local storage.
  • a plurality of renditions may have the same encoding quality parameter value (or a range of encoding quality parameter values). Further, each rendition of the plurality of renditions may include a plurality of segments, and each rendition may include a plurality of segments having different resolutions.
  • the content provider when the content provider is queried for an IP address for providing content through the origin server 210 or a name server (not shown), the content provider re-directs to the CDN management server (not shown) or the origin server ( 210) In consideration of the situation of the user terminal 230 requested by the CDN management server itself or redirected, the edge servers 223 and 224 having the corresponding content are determined and the corresponding access path is provided to the user terminal 230 Can.
  • the user terminal 230 may access the IP address of the previously stored CDN management server to make a content provision request, and the CDN management server determines the appropriate edge server in consideration of the requested user terminal's situation and uses the corresponding access path. You can tell the terminal.
  • the content provider transmits a manifest file as a response when it is requested to provide content through the origin server 210 or the name server, and the user terminal 230 has a plurality of renditions having different bit rates of the same content Based on the manifest file including the access information for the user terminal, and considering the network situation of the user terminal 230, the content request to the edge server 223 or 224 is requested according to the access information of the manifest file for the appropriate rendition (request to provide the rendition) )can do.
  • the origin server 210 or the high-tier caching node of the CDN may transmit bitstream data for the requested rendition to the requested CDN devices 221 to 224. .
  • the origin server 210 may receive a transmission request for all or at least one rendition of a plurality of renditions of a specific content from the CDN device, and the origin server 210 may revert to the requested CDN devices 221 to 224. All of the renditions of or at least one rendition can be transmitted.
  • a plurality of renditions having different bit rates of the same content may be stored in different edge servers 223 and 224 for each rendition.
  • the user terminal 230 receives a higher bit rate rendition from the first edge server 223 based on a manifest file including information on a plurality of renditions having different bit rates,
  • the lower bit rate rendition may be inherited from the second edge server 224 by referring to the network situation and the manifest file.
  • the upper bitrate rendition of the first edge server 223 and the lower bitrate rendition of the second edge server are the same encoding quality parameter values (or encoding) as the renditions 301, 302, 303 of FIG. Quality parameter values), and may be composed of a plurality of segments, each having a different resolution.
  • a content source may be provided to be encoded as a bitstream, or an encoded bitstream may be packaged.
  • packaging a manifest file based on bitstreamed renditions may be included.
  • the origin server 210 or the upper layer CDN caching node may encode or encode a plurality of renditions having different bit rates or receive a plurality of renditions.
  • each rendition is composed of a plurality of segments having different resolutions, and the encoding quality parameter value (or range of encoding quality parameter values) of each rendition may be the same even if the renditions are different.
  • the origin server 210 or the upper layer CDN caching node acts as an encoder to transmit content source data at upper/middle/lower ranges with bitrates of 3Mbps, 1Mbps, and 0,5Mbps, respectively. It can be encoded or provided in the sections 301 to 303, and the number of renditions is not particularly limited.
  • the upper rendition 301, the middle rendition 302, and the lower rendition 303 may each consist of a plurality of segments, and each rendition 301, 302, 303 may be different. It may include a plurality of segments with resolution.
  • the upper renditions 301 are 720p (which will be described as horizontal resolution for convenience), first/second/third segments 311, 321 having resolutions of 1080p, 720p, respectively. , 331, and the middle rendition 302 and the lower rendition 303 may also include a plurality of segments of different resolutions.
  • each rendition 301, 302, 303 may have the same encoding quality parameter value (or range of encoding quality parameter values).
  • the resolution change pattern of the segments included in each rendition 301, 302, 303 may be the same.
  • the upper rendition 301 has a larger resolution of the second segment 321 than the resolution of the first segment 311, and the resolution of the third segment 331 is the second segment 321 ), which is smaller than the resolution of the first segment 311 again.
  • Such a change in resolution may show a change such as a change in resolution in the segments included in the middle rendition 302 and the lower rendition 303.
  • the plurality of renditions are all stored in the CDN caching nodes 221 and 222 of the middle tier and/or the edge servers 223 and 224, or by each CDN gasing node of the middle tier and/or for each edge server. Only one rendition can be stored.
  • FIG. 4 schematically shows an embodiment of generating a plurality of renditions having different bit rates.
  • the origin server 110 or 210 or a separate encoding device encodes content original data, and is a plurality of renditions having different bit rates, and each rendition is a plurality of renditions having different resolutions.
  • Each segment of the same rendition may include segments, and a plurality of renditions having a preset range of encoding quality parameter values or the same encoding quality parameter values may be generated.
  • the origin server 110 or 210 or a separate encoding device receives the content original data and generates a plurality of intermediate (temporary) renditions for each resolution, but each intermediate renditions has the same encoding quality parameter value. (Or a range of encoding quality parameter values). Accordingly, even in the case of the same intermediate rendition, segments having different data sizes (bitrates) may be generated according to image characteristics (motion, complexity, etc.) of the content original data encoded as shown in FIG. 4.
  • the origin server 110 or 210 or a separate encoding device receives content original data and has a resolution of 1080p (described in a horizontal resolution for convenience), 720p, 480p, and 320p respectively.
  • the second/third/fourth intermediate renditions 410, 420, 430, and 440 may be generated, and the encoding quality parameter value (or range of values) of each intermediate rendition may be the same.
  • each intermediate rendition is encoded with a fixed resolution and encoding quality parameter value (or a range of values), it is encoded with different data sizes (bitrates) according to the video characteristics of the content source. That is, a segment file size increases for a scene having a lot of motion or a complex scene, and in the opposite case, the segment file size decreases.
  • each segment of the first intermediate rendition 410 has the same resolution and the same encoding quality parameter value (or a range of encoding quality parameter values) of 1080p, but the video characteristics of the content of the content original According to each of the segments 411, 412, and 413, the file size in order may be 5 Mbps, 3 Mbps, and 5 Mbps again.
  • segment file size change may be the same in other intermediate renditions 420, 430, and 440.
  • the final rendition is configured according to a bit rate criterion of 3 Mbps, 1 Mbps, and 0.5 Mbps set in the manifest
  • intermediate renditions 410, 420, 430 After the first segments 411, 421, 431, and 441 of 440 are generated, the first segment 311 of the upper rendition 301 is the first segment 421 of the second intermediate rendition 420. And configure the first segment 312 of the median rendition 302 as the first segment 431 of the third intermediate rendition 430, and the first segment 441 of the fourth intermediate rendition 440. ) To configure the first segment 313 of the lower rendition 303.
  • each segment of the same rendition in each final rendition corresponds to a different reproduction part of the content data, and is selected in the intermediate rendition so that the reproduction order does not overlap.
  • a peak signal-to-noise ratio PSNR
  • a structural similarity index SSIM
  • Quality measurement is performed using a measurement method such as Multi-scale Structural Similarity (MS-SSIM) or Video Multimethod Assessment Fusion (VMAF), and it does not meet the preset quality standards based on the quality of the measured intermediate rendition segment. Rather, a final rendition may be configured using a segment of an intermediate rendition having a lower bitrate.
  • PSNR peak signal-to-noise ratio
  • SSIM structural similarity index
  • MS-SSIM Multi-scale Structural Similarity
  • VMAF Video Multimethod Assessment Fusion
  • the bit rate is lower than that.
  • the quality of the first segment 431 of the second intermediate rendition 430 may be measured, and the first segment 311 of the upper rendition 301 may be configured using the quality.
  • the second segments 412, 422, 432, and 442 of the intermediate renditions 410, 420, 430, and 440 are generated, and then the two of the final renditions are based on the second segments of each intermediate rendition.
  • the third segments can be configured, which is the same for the third segments 331, 332, 333 of the final renditions 301, 302, 303.
  • the origin server 110 or 210 or a separate encoding device or a separate packaging device may generate a manifest file for the generated final renditions.
  • Generation of intermediate renditions and final renditions can be generated simultaneously using multiple encoders, and when encoding a live stream, a short time interval from the input of the live stream (e.g., playback time of one segment) You can create final renditions in near real time.
  • 5 schematically shows the configuration of the edge servers 223 and 224.
  • the edge server (223, 224) is a storage unit 510 for storing a plurality of renditions or any one rendition having a different bit rate for a particular video content temporarily or for a period of time, from the user terminal
  • a communication unit 520 that receives a content transmission request or a rendition transmission request and transmits a response thereto, and a control unit 530 that controls the communication unit 520 to transmit a rendition in response to the transmission request of the user terminal It may include.
  • the edge servers 223 and 224 request a plurality of renditions or renditions having different bitrates to the upper caching node or origin server according to a user's request for content, and transmit the request to the storage unit Can be saved.
  • the edge servers 223 and 224 may receive a plurality of renditions or renditions having different bit rates for video content from an upper caching node or origin server, and store them in a storage unit.
  • each rendition of the plurality of renditions may have the same encoding quality parameter value (or a range of encoding quality parameter values) with each other, and each len
  • the partition may include a plurality of segments having different resolutions as shown in FIG. 3.
  • the storage unit 510 may include a magnetic storage media, a flash storage media, and may be a temporary storage medium or a semi-permanent storage medium, but the scope of the present invention is not limited thereto. .
  • the communication unit 520 may receive a request for transmission of a specific rendition of video content from a user terminal, and the control unit 530 transmits at least one segment of the requested rendition by the communication unit 520 in response thereto. Can be controlled.
  • the communication unit 520 may receive a transmission request of another rendition for the same video content by changing the network environment from the user terminal, and the control unit 530 causes the communication unit 520 to respond in response to this. It can be controlled to transmit at least one segment of the rendition, in which case, as described above, the segment of the other rendition has a different bitrate than the segment of the first transmitted rendition, but the encoding quality parameter value (or the encoding quality parameter value) Range) may be the same.
  • FIG. 6 schematically shows the configuration of a content server.
  • the content server may be an origin server 110 or 210 or an upper layer CDN caching node.
  • the content server includes a packaging unit 610, a communication unit 620, and a control unit 630 for controlling the communication unit 520 to transmit any rendition in response to a transmission request from the CDN device. Can.
  • the packaging unit 610 of the content server encodes the original mezzanine file of the content, a live stream, etc. at different bitrates, or a manifest file based on a plurality of renditions having different bitrates provided. You can create
  • each rendition of a plurality of renditions based on the manifest file has an encoding quality parameter value (or a range of values) of each other. It can be the same.
  • each rendition of the plurality of renditions may include a plurality of segments having different resolutions as shown in FIG. 3.
  • the manifest file may include bitrate information for a plurality of renditions, content playback time, a connection path (URL, etc.), encoding type, segment resolution, and the like.
  • the manifest file may be a method of indicating a manifest file of each rendition, and the manifest file of each rendition may include information about a segment access path of each rendition, a segment playing time, an encoding type, and a segment resolution. have.
  • the packaging unit 610 of the content server may package each rendition in the form of HTTP Live Streaming (HLS), Dynamic Adaptive Streaming over HTTP (DASH), and Microsoft Smooth Streaming (MSS).
  • HLS HTTP Live Streaming
  • DASH Dynamic Adaptive Streaming over HTTP
  • MSS Microsoft Smooth Streaming
  • the communication unit 620 may receive a transmission request for a specific rendition (eg, a higher bitrate rendition) or all of the renditions of the video content from the CDN device (edge server, intermediate layer caching node, etc.), In response, the controller 630 may control the communication unit 620 to transmit the rendition or all of the renditions requested by the CDN device to the CDN device.
  • a specific rendition eg, a higher bitrate rendition
  • the controller 630 may control the communication unit 620 to transmit the rendition or all of the renditions requested by the CDN device to the CDN device.
  • each rendition when the CDN device requests transmission of a plurality of renditions for a specific content, the bit rate of each rendition is different, but the encoding quality parameter value (or range of encoding quality parameter values) is the same, and each The rendition may include a plurality of segments having different resolutions as shown in FIG. 3.
  • the packaging unit or control unit includes application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), complex programmable logic devices (CPLDs), and radio frquency (RFICs) in addition to general-purpose central processing units (CPUs). Integrated circuits), ASSPs (application specific standard products), or instructions executable by the processor or firmware or software.
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • CPLDs complex programmable logic devices
  • RFICs radio frquency
  • CPUs general-purpose central processing units
  • ASSPs application specific standard products
  • FIG. 7 schematically illustrates the operation of the edge servers 223, 224.
  • the edge servers 223 and 224 may store a plurality of renditions having different bit rates of video content from the origin servers 110 and 210 or higher caching nodes (S710). Each rendition of the plurality of renditions may have the same encoding quality parameter value (or a range of encoding quality parameter values). Each rendition of the plurality of renditions may include a plurality of segments, in which case at least two of the plurality of segments may be segments having different resolutions from each other.
  • the edge server 223 or 224 When the edge server 223 or 224 receives a request for a specific content or a request for any rendition of a specific content from the user terminals 130 and 230 (S720), the user terminal is suitable for the requested rendition or network situation.
  • the rendition may be transmitted to the user terminals 130 and 230 (S730).
  • the edge servers 223 and 224 start transmission from the first segment of the higher bitrate rendition.
  • the user terminal may request to the edge server for each segment transmission or to the edge server in a certain number of segment units.
  • the network conditions of the user terminals 130 and 230 may change to request a lower bitrate rendition rather than a higher rendition (S740).
  • subsequent segments of the lower rendition may have the same segment as that of the previous retransmission and the encoding quality parameter value (or a range of encoding quality parameter values).
  • the content server may be an origin server 110 or 210 or an upper layer CDN caching node.
  • the content server encodes the original mezzanine file of the content, a live stream, etc. at different bitrates or receives a plurality of encoded renditions, and generates or provides a manifest file based on a plurality of renditions having different bitrates. It can be received and stored temporarily or for a certain period of time (S810).
  • each rendition of the plurality of renditions based on the manifest file may have the same encoding quality parameter value (or a range of encoding quality parameter values) with each other. .
  • Each rendition of the plurality of renditions may include segments having different resolutions as shown in FIG. 3.
  • the manifest file may include bitrate information for a plurality of renditions, content playback time, access path (URL, etc.), encoding type, segment resolution, and the like, and the manifest file includes a manifest file for each rendition. It may be indicative, and the manifest file of each rendition may include information about the segment access path of each rendition, the playback time of the segment, the encoding type, the resolution of the segment, and the like.
  • the content server may receive a request for transmission of a specific rendition (eg, a higher bitrate rendition) or all of the renditions of the video content from the CDN device (edge server, middle-layer caching node, etc.) (S820).
  • the CDN device may transmit the requested rendition or all of the renditions to the CDN device (S830).
  • each rendition may include a plurality of segments having different resolutions as shown in FIG. 3.
  • the term “part” may mean a unit including one or more combinations of hardware, software, or firmware, for example.
  • Part may be used interchangeably with terms such as, for example, a unit, logic, logical block, component, or circuit.
  • the "unit” may be a minimum unit of an integrally formed component or a part thereof.
  • the “unit” may be a minimum unit performing one or more functions or a part thereof.
  • Part may be implemented mechanically or electronically.
  • “part” is either an application-specific integrated circuit (ASIC) chip, field-programmable gate arrays (FPGAs) or programmable-logic devices (ASICs) that perform certain operations, known or to be developed in the future. It may include at least one.
  • ASIC application-specific integrated circuit
  • FPGAs field-programmable gate arrays
  • ASICs programmable-logic devices
  • At least a part of an apparatus (eg, modules or functions thereof) or a method (eg, operations) according to various embodiments is computer-readable storage media, for example, in the form of a program module. It can be implemented as a command stored in. When the instruction is executed by a processor, the one or more processors may perform a function corresponding to the instruction.
  • the computer-readable storage medium may be, for example, the storage unit 510.
  • Computer-readable recording media include hard disks, floppy disks, magnetic media (eg magnetic tape), optical media (eg compact disc read only memory (CD-ROM), DVD ( digital versatile discs, magneto-optical media (such as floptical disks), hardware devices (such as read only memory (ROM), random access memory (RAM), or flash memory)
  • the program instructions may include machine language codes such as those produced by a compiler, as well as high-level language codes executable by a computer using an interpreter or the like. It may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.
  • the module or program module may include at least one or more of the above-described components, some of them may be omitted, or additional other components may be further included. Operations performed by modules, program modules, or other components according to various embodiments may be performed in a sequential, parallel, repetitive or heuristic manner. Also, some operations may be executed in a different order, omitted, or other operations may be added.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Information Transfer Between Computers (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

La présente invention concerne concerne un procédé de diffusion en continu de vidéo par un serveur de bord qui comprend les opérations, effectuées par un dispositif informatique, consistant à : stocker une pluralité de restitutions, qui comprennent des débits binaires différents du même contenu vidéo, chacune des restitutions comprenant une pluralité de segments présentant des résolutions différentes, et des segments respectifs de la pluralité de restitutions présentent la même plage pour une valeur de paramètre de qualité de codage ; recevoir une première demande provenant d'un terminal utilisateur ; et transmettre un premier segment d'une première restitution parmi la pluralité de restitutions en réponse à la première demande provenant du terminal d'utilisateur.
PCT/KR2018/016886 2018-12-27 2018-12-28 Appareil, système, et procédé de diffusion en continu de contenu WO2020138567A1 (fr)

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KR10-2018-0171354 2018-12-27
KR1020180171354A KR20200081161A (ko) 2018-12-27 2018-12-27 컨텐츠 스트리밍 장치, 시스템 및 방법

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KR102363144B1 (ko) * 2020-07-09 2022-02-14 동국대학교 경주캠퍼스 산학협력단 사용자의 네트워크 상태를 기반으로 가상 3d 객체를 모델링하는 방법 및 장치
KR102539674B1 (ko) * 2022-10-20 2023-06-02 주식회사 메디씽큐 캐시 서버를 이용한 수술 영상 전송 방법 및 이를 이용한 시스템
KR102539691B1 (ko) * 2022-10-20 2023-06-02 주식회사 메디씽큐 수술 단계 영상 전송 방법 및 이를 이용한 시스템

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