WO2015120766A1 - Système et procédé d'optimisation de vidéo - Google Patents

Système et procédé d'optimisation de vidéo Download PDF

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Publication number
WO2015120766A1
WO2015120766A1 PCT/CN2015/071210 CN2015071210W WO2015120766A1 WO 2015120766 A1 WO2015120766 A1 WO 2015120766A1 CN 2015071210 W CN2015071210 W CN 2015071210W WO 2015120766 A1 WO2015120766 A1 WO 2015120766A1
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Prior art keywords
video
resource
transcoding
attribute information
source
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PCT/CN2015/071210
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English (en)
Chinese (zh)
Inventor
雷霆
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华为技术有限公司
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Publication of WO2015120766A1 publication Critical patent/WO2015120766A1/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
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless 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]
    • H04N21/60—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 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6373—Control signals issued by the client directed to the server or network components for rate control, e.g. request to the server to modify its transmission rate

Definitions

  • the present invention relates to the field of video processing technologies, and in particular, to a video optimization system and method.
  • FIG. 1 is a schematic structural diagram of a video service in the prior art.
  • the video optimization system When the terminal sends a video access request to a video provider, the video optimization system The video access request will also be obtained.
  • the video optimization system first matches the cache system to match whether there is a video resource corresponding to the access request. If there is a video resource in the cache system, the video optimization system will directly read the video from the cache system. If the video resource does not exist in the cache system, the video optimization system forwards the video access request to the network server, and then delivers the video resource returned by the network server to the terminal.
  • the current video optimization system can directly read out the cached video data in the cache system, the current cache system can only cache the source video resources, so if the network is congested, if the source video resources in the cache system are directly cached, Sending to the terminal will cause the video resource transmission between the video optimization system and the client to be slow or even impossible to transmit.
  • the embodiment of the invention provides a video optimization system and method for solving the problem that the video resource transmission speed between the video optimization system and the client is slow or even impossible to be transmitted in the case of network congestion in the prior art.
  • a first aspect of the embodiments of the present invention provides a video optimization system, including:
  • a determining module configured to: when receiving an access request of the source video resource sent by the client, determining that at least one transcoded video resource corresponding to the requested source video resource is cached in the video cache system, where the transcoded video resource Support transmission in network congestion state;
  • a processing module configured to determine, in the source video resource and the at least one transcoded video resource, a video resource that supports transmission in a current network congestion state
  • a sending module configured to send the determined video resource to the client.
  • the processing module is specifically configured to obtain a source video resource and a code rate corresponding to each video resource in the at least one transcoded video resource, where the obtained code rate is obtained. Determining, according to the determined code rate, the video corresponding to the code rate in the source video resource and the at least one transcoding resource, Resources, as video resources that support transmission in the pre-network congestion state.
  • a second aspect of the embodiments of the present invention provides a video cache system, including:
  • a management module configured to obtain source video attribute information of the cached source video resource, and determine at least one destination video attribute information according to the source video attribute information of the source video resource, where the destination video attribute information is the source video The video attribute information of the destination video obtained after the resource is transcoded;
  • a sending module configured to send the source video resource, the source video attribute information, and the at least one destination video attribute information to a video transcoding system
  • a cache module configured to receive at least one transcoded video resource obtained by transcoding the source video resource according to the source video attribute information and the at least one destination video attribute information returned by the video transcoding system, And receiving the received at least one transcoded video resource, wherein different transcoded video resources support transmission in different network congestion states.
  • the management module is specifically configured to obtain a rating parameter that is used to perform a rating on a quality of a video resource, and determine a characterization video resource corresponding to a rating parameter that is greater than or equal to a threshold.
  • the video attribute information of the attribute, and the determined video attribute information is used as the destination video attribute information.
  • the source video attribute information acquired by the management module includes a source code rate of the source video resource, and each destination video attribute information is included. Each includes a destination bit rate that is less than the source code rate, and each of the destination video attribute information includes a different target bit rate.
  • the management module is further configured to obtain a total number of access requests for each video resource in all cached video resources, and the total number of access requests exceeds a threshold.
  • the resource acts as the source video resource.
  • the management module is further configured to send an authentication request for carrying the identifier information of the video cache system to the transcoding system, and receive the video transcoding system to return Representing the response information passed by the video cache system for authentication.
  • the management module is further configured to send, to the video transcoding system, a transcoding request for applying a transcoding resource, where the transcoding request carries the The source video attribute information and the at least one destination video attribute information, when receiving the response information indicating that the transcoding resource application is successful, returned by the video transcoding system, sending the source video resource to the video transcoding system .
  • a third aspect of the embodiments of the present invention provides a video transcoding system, including:
  • a transcoding management module configured to receive a source video resource to be transcoded and a source video attribute information corresponding to the source video resource, and at least one destination video attribute information, where the destination video attribute information is the source Video attribute information after the video resource is transcoded;
  • a transcoding module configured to transcode the source video resource into at least one transcoded video resource based on the source video attribute information and the at least one destination video attribute information, where different transcoded video resources are supported differently Transmission under network congestion;
  • a sending module configured to send the at least one transcoded video resource to the video buffer system.
  • the transcoding module is specifically configured to obtain a source code rate included in the source video attribute information and a destination bit rate included in each destination attribute information, according to For each destination code rate, the source video resource is transcoded into at least one transcoded video resource having a destination code rate, wherein one transcoded video resource has a destination bit rate, and each transcoded video resource has a purpose
  • the code rates vary.
  • the transcoding management module is further configured to receive an authentication of the identifier information that is sent by the video cache system and that carries the video cache system. And, when the identifier information matches the preset identifier information, sending, to the video buffer system, response information that identifies the authentication of the video cache system.
  • the transcoding management module is further configured to receive a transcoding request sent by the video caching system for applying a transcoding resource, where the transcoding request is And carrying the source video attribute information and the at least one destination video attribute information, returning the response information of the transcoding resource application success to the video buffer system, and receiving the source video resource sent by the video cache system.
  • a fourth aspect of the embodiments of the present invention provides a video optimization method, including:
  • the determined video resource is sent to the client.
  • the video resources that are supported in the previous network congestion state are determined in the source video resource and the at least one transcoded video resource, including:
  • a fifth aspect of the embodiments of the present invention provides a video buffering method, including:
  • At least one transcoded video resource obtained by transcoding the source video resource according to the source video attribute information and the at least one destination video attribute information, where different The code video resource supports transmission in different network congestion states; and the received at least one transcoded video resource is buffered.
  • the source video attribute information includes a source code rate of the source video resource, and each destination video attribute information includes a destination bit rate that is less than the source code rate. And the destination bit rate included in each destination video attribute information is different.
  • the method before acquiring the source video attribute information of the cached source video resource, the method further includes:
  • the video resource whose total number of access requests exceeds the threshold is used as the source video resource.
  • the method before the sending the source video resource and the source video attribute information and the at least one destination video attribute information to the transcoding system, the method further includes:
  • the source video resource and the source video attribute information of the source video resource and the at least one destination video attribute information are sent to the video transcoding system, including:
  • transcoding request for applying a transcoding resource, where the transcoding request carries the source video attribute information and the at least one destination video attribute information;
  • a video optimization system is further provided.
  • the video optimization system determines whether at least one corresponding to the active video resource is cached in the video cache system. Code video resources, if active video is cached in the video cache system When the at least one transcoded video resource corresponding to the resource is used, the video optimization system determines, according to the current network congestion status, the video resource that can be transmitted in the current network congestion state in the source video resource and the at least one transcoded video resource, and acquires the video resource.
  • the obtained video resource is sent to the client, so that the video optimization system sends different video resources to the client according to different network congestion states, for example, sending a transcoded low-rate transcoded video resource when the network is severely congested.
  • the transcoded video resource or the source video resource of the high bit rate is sent, so that the video resource can be transmitted to the value client more smoothly under the premise of ensuring the video quality, thereby improving the user experience. .
  • the video cache system when the source video resource that is cached in the video cache system is frequently accessed, acquires source video attribute information of the source video resource and at least one destination video attribute information corresponding to the source video resource, and Transmitting the source video resource, the source video attribute information, and the at least one destination video attribute information to the video transcoding system, and then receiving the at least one transcoded video resource returned by the video transcoding system, where the code rate of the transcoded video resource is smaller than the source video resource.
  • the last video cache system will cache the transcoded video resources, thereby realizing the cache of the transcoded video resources by the video cache system, and improving the utilization of the cache system.
  • the embodiment of the present invention further provides a video transcoding method, in which the video transcoding system is based on a source video resource, source video attribute information, and at least one destination video attribute information sent by a video caching system.
  • the video resource is transcoded into at least one transcoded video resource, and each transcoded video resource has a destination video attribute information, for example, transcoding the source video resource into a plurality of transcoded video resources having different code rates, and finally the video is transferred.
  • the code system sends all the transcoded video resources to the video buffer system for caching, so the video transcoding system realizes the transcoding of the multi-video attributes of the source video resources, so that the video transcoding system can provide multiple video attributes for the video caching system. Transcode video resources.
  • FIG. 1 is a schematic structural diagram of a video service system in the prior art
  • FIG. 2 is a schematic structural diagram of a video optimization system according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a video buffer system according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a video transcoding system according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a video service system according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a process of video access according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a video optimization method according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a video buffering method according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of a video transcoding method according to an embodiment of the present invention. .
  • the video optimization system When the client initiates a video access request to the video service provider that provides the video service, the video optimization system will also receive the video access request, and the video optimization system first queries the cache system whether the video resource that the user needs to access is cached. When the video resource is cached in the system, the video optimization system directly reads the video resource from the cache system and forwards the video resource to the client; if the video resource does not exist in the cache system, the video optimization system acquires the video resource from the network server. Video resources, and forward the obtained video resources to the client.
  • the video optimization system in the above solution can only send the source video resources provided by the network server to the client.
  • the video optimization system can only send the source video file to the client, which will result in a video optimization system.
  • the video resource transfer between the client and the client is slower and cannot even be transmitted.
  • a video optimization system including a determining module, a processing module, and a sending module, and a determining module, configured to determine a cache when receiving an access request of a video resource sent by the client.
  • At least one transcoded video resource corresponding to the requested source video resource is cached in the system, and is used for determining, in the source video resource and the at least one transcoded video resource, the transcoded video resource that is supported in the previous network congestion state, and sending A module for sending the determined video resource to the client.
  • the video optimization system can provide the client with video resources that use the network congestion state based on different network congestion states, for example, providing a low-code rate transcoding video resource when the congestion state is severe, and providing when the network congestion state is not serious.
  • the high-rate transcoded video resource or the source video resource not only makes full use of the network resources, but also enhances the user experience.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the embodiment of the present invention further provides a video optimization system, as shown in FIG. 2, which is a schematic structural diagram of a video optimization system according to an embodiment of the present invention.
  • the system includes:
  • the determining module 201 is configured to: when receiving the access request of the source video resource sent by the client, determine that at least one transcoded video resource corresponding to the requested source video resource is cached in the cache system;
  • the processing module 202 is configured to determine, in the source video resource and the at least one transcoded video resource, a transcoded video resource that supports transmission in a previous network congestion state;
  • the sending module 203 is configured to send the obtained transcoded video resource to the client.
  • the determining module 201 in the video optimization system first determines whether the video resource is cached in the cache system, where the video resources cached in the cache system are
  • the possibility for example, may be a source video resource, that is, a video resource that has not undergone transcoding, and may of course be a source video resource and a transcoded transcoded video resource.
  • the video optimization system can only return the source video resource to the client;
  • the video optimization system may select to return the transcoded video resource to the client, and the specific selection manner is as follows:
  • the transcoded video resources include the following three types:
  • transcoded video resource having a resolution of 240P, a frame rate of 25, a codec format of H264, and a code rate of 322 kpbs;
  • transcoded video resource having a resolution of 480P, a frame rate of 25, a codec format of H264, and a code rate of 1205 kpbs;
  • the video optimization system needs to determine which type of transcoded video resource to send.
  • the video optimization system will acquire the current state of network congestion, and the processing module 202 in the video optimization system will acquire all the transcoded video resources.
  • a code rate corresponding to each transcoded video resource determining, in each of the obtained code rates, a code rate that is transmitted in a current network congestion state, and determining a location in the at least one transcoding resource based on the determined code rate.
  • the transcoded video resource corresponding to the code rate is used as a transcoded video resource that supports transmission in a pre-network congestion state.
  • the processing module 202 selects 322 kpbs among the three code rates of 1205 kpbs, 732 kpbs, and 322 kpbs, and then determines the transcoded video resource corresponding to the code rate, that is, has a resolution of 240P, Transcoding video resources with a frame rate of 25, a codec format of H264, and a code rate of 322 kpbs can ensure that the transcoded video resources can be smoothly transmitted to the client when the network is heavily congested by selecting a transcoded video resource with a low bit rate. The ability to view the video of the process while also ensuring the quality of the video resources.
  • the video optimization system will determine a high-code rate transcoded video resource, that is, a transcoded video having a resolution of 480P, a frame rate of 25, a codec format of H264, and a code rate of 1205 kpbs.
  • the resource then sends the high-rate video resource to the client; of course, when the network congestion status is not serious, the source video resource can also be directly sent to the client.
  • the video optimization system when the video optimization system obtains the video resource access request from the client, it is determined whether at least one transcoded video resource corresponding to the video resource is cached in the cache system, and at least the video resource corresponding to the cached system is cached in the cache system.
  • the video optimization system determines, according to the current network congestion status, the transcoded video resource that can be smoothly transmitted in the current network congestion state in the source video resource and the at least one transcoded video resource, and acquires The transcoded video resource is sent to the client, so that the video optimization system dynamically adjusts the video resource sent to the client based on different network congestion states, that is, when the network congestion is severe, the low-rate transcoded video resource is sent.
  • the network congestion status is light, the high-rate transcoded video resource or the source video resource is sent, so that the video optimization system can smoothly transmit the video resources required by the user to the client under the premise of ensuring the video quality, thereby improving The user experience.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the video buffer system supports transcoding video resources of different code rates, and the present invention is implemented as shown in FIG. 3, in order to enable the video optimization system to provide the client with a transcoded video resource that supports different network congestion states.
  • a schematic diagram of a structure of a video caching system, the video caching system includes:
  • the management module 301 is configured to obtain the source video attribute information of the cached source video resource, and determine at least one destination video attribute information according to the source video attribute information of the source video resource, where the destination video attribute information is obtained by transcoding the source video resource. Video attribute information of the destination video;
  • the sending module 302 is configured to send the source video resource and the source video attribute information and the at least one destination video attribute information to the transcoding system;
  • the cache module 303 is configured to receive at least one transcoded video resource obtained by transcoding the source video resource according to the source video attribute information and the at least one destination video attribute information returned by the transcoding system, and receive the at least the received video resource A transcoded video resource is cached, wherein different transcoded video resources are supported for transmission in different network congestion states.
  • the video cache system needs to cache the video resources with higher frequency of the client request, specifically, in the video cache system.
  • the total number of access requests for each video resource will be counted. If the total number of access requests for a video resource exceeds a preset threshold, the video cache system will send the video resource acquisition request to the network server, and receive the video returned by the network server. After the resource is cached, the video resource is cached, and the cached video resource is the source video resource.
  • the management module 301 calculates the total number of accesses of each of the source video resources of the cached video resources. If there is a source video resource whose total number of access requests exceeds the threshold, then The source video resource is used as a source video resource that can be transcoded. For example, the total number of access requests of a certain source video resource is 550, and the threshold set in the management module 301 is 500. When frequently requested, the management module 301 will generate a transcoding task for video transcoding of the source video resource.
  • the management module 301 will obtain and obtain source video attribute information of the source video resource.
  • the source video attribute information here must include at least a code rate, that is, 1367 kpbs.
  • the source video attribute information may further include one of video resolution, format, frame rate, and coded format.
  • the video attribute information of the source video resource may be: resolution 720P, frame rate 25, video format FLV, code rate 1367 kbps.
  • the management module 301 After the management module 301 obtains the source video attribute information of the source video resource, the management module 301 acquires a rating parameter that characterizes the quality of the video resource by the user, and determines a video attribute that represents the video resource attribute corresponding to the rating parameter that is greater than the equal threshold. Information, and the determined video attribute information is used as the destination video attribute information. For example, the management module 301 retrieves a user experience quality (English: Quality of Experience, QoE) model that stores user experience parameters, and stores a correspondence between user experience quality and video attribute information in the QoE model, such as Table 1 shows:
  • QoE Quality of Experience
  • Each of the experience scores in Table 1 corresponds to three video attribute information, for example, the corresponding video attribute information of 4.0. It includes:
  • the management module 301 After the management module 301 obtains the source attribute information of the source video resource, the at least one video attribute information with the experience score greater than or equal to 4.0 may be determined as the target view based on the QoE model. Frequency attribute information.
  • the source video attribute information acquired by the management module 301 is: resolution 720P, frame rate 25, code format H264, code rate 1367kpbs, based on the data recorded in the QoE model, the user experience score is 4.0 in the QoE model.
  • the video attribute information is as follows:
  • the selected target video attribute information is the highest user experience score, such as the video attribute information corresponding to 4.0 in Table 1, but in actual
  • the application may select video attribute information corresponding to different experience scores according to different application scenarios, for example, the destination video attribute information corresponding to the experience score of 3.5 may be selected.
  • the management module 301 can determine at least one destination video attribute information based on the source video attribute information.
  • the transcoding system needs to authenticate the video cache system, so the management module 301 will
  • the authentication request carrying the identification information of the video caching system is sent to the video transcoding system, where the identification information may be, but is not limited to, the IP address of the video caching system, and the video transcoding system receives the authentication request carrying the identification information.
  • the video transcoding system matches the identification information in the authentication request with the pre-stored identification information. If the video transcoding system matches, the video transcoding system sends the response information of the successful authentication to the management module 301.
  • the management module 301 will notify the sending module 302 of the video caching system.
  • the sending module 302 will apply to the video transcoding system for transcoding resources. Simply speaking, it is determined whether the video transcoding system can provide sufficient transcoding resources to transcode the source video resources, so the sending module 302 will transcode.
  • the system sends a transcoding request for applying the transcoding resource, and the source video attribute information and the at least one destination video attribute information are carried in the transcoding request.
  • the transcoding system passes the source video attribute information in the transcoding request and at least one destination video genus sexual information can determine whether there are enough transcoding resources to transcode the source video resources.
  • the sending module 302 receives the response information that the transcoding system returns the application for the transcoding resource failure, the sending module 302 is in a waiting state, that is, the source video resource in the buffer module 303 is not sent to the video transcoding system. This avoids the problem that the video buffering system blindly transmits the source video resources to the transcoding system, which causes the processing pressure of the transcoding system to increase, or causes the video transcoding system to be abnormal.
  • the sending module 302 If the sending module 302 receives the response information of the transcoding resource application successfully returned by the video transcoding system, the sending module 302 sends the source video resource buffered in the buffer module 303 to the video transcoding system, so that the video transcoding system can Transcoding based on source video resources.
  • At least one transcoded video resource after the transcoding is completed is sent to the video buffer system, and after the buffering module 303 in the video caching system receives the transcoded video resource, it will receive At least one transcoded video resource is cached.
  • the cache module 303 After the cache module 303 successfully caches the transcoded video resource, the cache module 303 sends a cached success message to the video transcoding system to enable the video transcoding system to determine to complete the video transcoding based on the information. At the same time, the cache module 303 notifies the management module 301 to delete the previously established transcoding task. Of course, the untranscoded source video resource is also saved in the cache system.
  • the video cache system when the source video resource that is cached in the video cache system is frequently accessed, acquires source video attribute information of the source video resource and at least one destination video attribute corresponding to the source video resource. And transmitting the source video resource, the source video attribute information, and the at least one destination video attribute information to the video transcoding system, and then receiving at least one transcoded video resource returned by the video transcoding system, where the code rate of the transcoded video resource is less than The code rate of the source video resource, and finally the video buffer system will cache the transcoded video resource, thereby realizing the buffering of the transcoded video resources of different code rates by the video caching system, and improving the utilization of the video caching system.
  • the video buffer system caches transcoded video resources of different code rates
  • the video buffer system can provide transcoded video resources of different code rates for the video optimization system, so that the video optimization system can cache according to the current network congestion status.
  • the system selects the transcoded video resource suitable for transmission in the current network state and sends it to the client. Under the premise of ensuring the video quality, the video transmission fluency between the video optimization system and the client is improved, and the user's Use experience.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • FIG. 4 is a schematic structural diagram of a video transcoding system according to an embodiment of the present invention.
  • the video transcoding system includes:
  • the transcoding management module 401 is configured to receive the source video resource to be transcoded and the source video attribute information corresponding to the source video resource and the at least one destination video attribute information that are sent by the cache system;
  • the transcoding module 402 is configured to transcode the source video resource into at least one transcoded video resource based on the source video attribute information and the at least one destination video attribute information;
  • the sending module 403 is configured to send the at least one transcoded video resource to the cache system.
  • the cache system needs to be authenticated before transcoding, so the source code is received in the transcoding management module 401.
  • the transcoding management module 401 further receives the authentication request sent by the cache system, where the authentication request carries the identification information of the cache system, which may be, but is not limited to, an IP address.
  • the video transcoding system will not provide a transcoding service for the caching system.
  • the transcoding management module 401 of the video transcoding system returns the response information of the successful authentication to the cache system.
  • the video caching system needs to apply for transcoding resources to the video transcoding system, so the video caching system sends the response information to the video transcoding system based on the successful response information.
  • Applying a transcoding request for transcoding resources the transcoding request carries source video attribute information of the source video resource to be transcoded and at least one destination video attribute information.
  • the transcoding management module 401 in the video transcoding system determines the code rate of the source video resource from the source video attribute information, and determines, from the at least one destination video attribute information, each video attribute information.
  • the code rate for example, the code rate in the source video attribute information is 1367kpbs, and the destination attribute information has three in total, and the corresponding code rates are: 1205kpbs, 732kpbs, 322kpbs.
  • the video transcoding system determines that the source video resources with a code rate of 1367 kpbs need to be transcoded into transcoded video resources with a code rate of 1205 kpbs, 732 kpbs, and 322 kpbs, respectively. Under such preconditions, the transcoding management module 401 will statistically calculate whether the transcoding resource that can be used in the current transcoding system can complete the transcoding task. If the transcoding task cannot be completed, the transcoding management module 401 will A wait instruction is generated and sent to the cache system to instruct the video cache system to wait for video transcoding.
  • the transcoding management module 401 determines that the current transcoding resource can complete the transcoding task, the transcoding management module 401 generates a response message indicating that the transcoding resource application is successful, and sends the response information to the video buffer system.
  • the video caching system will send the source video resource to be transcoded to the video transcoding system based on the response information.
  • the transcoding management module 401 After the transcoding management module 401 receives the source video resource to be transcoded, the transcoding management module 401 transfers the source video resource to the transcoding module 402, and the transcoding module 402 will be based on the source video resource and the source video resource of the source video resource.
  • the information and at least one destination attribute information are transcoded, and the video resource after transcoding by the video transcoding system has the destination video attribute information, as follows:
  • the source video attribute information of the source video resource is: resolution 720P, frame rate 25, video format FLV, and code rate 1367 kbps.
  • the destination video attribute information is:
  • the final transcoding system transcodes the source video resource to:
  • transcoded video resource having a resolution of 240P, a frame rate of 25, a codec format of H264, and a code rate of 322 kpbs;
  • transcoded video resource having a resolution of 360P, a frame rate of 25, a codec format of H264, and a code rate of 732 kpbs;
  • a transcoded video resource having a resolution of 480P, a frame rate of 25, a codec format of H264, and a code rate of 1205 kpbs.
  • the obtained at least one transcoded video resource is sent to the video cache system for buffering by the sending module 403.
  • the video transcoding system When the video transcoding system receives the response information returned by the video buffer system to characterize the cache success Thereafter, the video transcoding system will determine that the transcoding is complete and delete the transcoding task.
  • the video transcoding system transcodes the source video resource into at least one transcoded video resource, each transcoded video resource, based on the source video resource, the source video attribute information, and the at least one destination video attribute information sent by the cache system.
  • Each has a destination video attribute information, such as transcoding the source video resource into a plurality of transcoded video resources having different code rates, and finally the video transcoding system sends all the transcoded video resources to the video buffer system for caching, so
  • the video transcoding system implements transcoding of multiple video attributes of the source video resource, and the video transcoding system also implements video transcoding of multiple bit rates.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the embodiment of the present invention further provides a video service system.
  • FIG. 5 it is a schematic structural diagram of a video service system according to an embodiment of the present invention.
  • the service system includes: a video optimization system, and a Cache connected to the video optimization system.
  • the system, as well as the video transcoding system connected to the Cache system, the business processes between the various systems are as follows:
  • the client initiates a video access request to the network server.
  • the video optimization system queries the Cache system to cache the accessed video resource. If the video resource is cached, the process proceeds to step 3. If the video resource is not cached in the Cache system, the process proceeds to step 4;
  • the video optimization system acquires the video resources cached in the Cache system
  • the video optimization system forwards the video resources obtained in the Cache system to the client;
  • the video optimization system requests video resources from the network server
  • the video optimization system receives the video resource returned by the web server
  • the video optimization system forwards the video resource returned by the web server to the client;
  • the Cache system counts the total number of accesses of the requested video resources in a unit time. When there is a video resource whose total number of accesses is greater than the threshold, the video resource is requested from the network server.
  • the Cache system caches the video resources returned by the web server
  • the Cache system collects real-time statistics on the video resources of the cached video resources that have access times exceeding the threshold
  • the Cache system creates a transcoding task, obtains source video attribute information of the video resource whose access times exceed the threshold, and acquires at least one item.
  • Video attribute information
  • the Cache system sends an authentication request carrying the IP address of the Cache system to the video transcoding system. If the information of the authentication failure is received, the transcoding task is terminated. If the information of successful authentication is received, step 13 is performed. ;
  • the Cache system sends a request for transcoding resources to the transcoding system, where the request carries the source video attribute information and the at least one destination video attribute information. If the transcoding resource application fails, the Cache system adjusts to wait for the transcoding status. If the transcoding resource application is successful, step 14 is performed;
  • the Cache system sends the video resource to the video transcoding system
  • the video transcoding system starts the transcoding task according to the video resource, the source video attribute information, and the at least one destination video attribute information sent by the Cache system, and the source video attribute information includes the source video resource source code rate and at least one destination video attribute information.
  • the destination video attribute information includes a destination bit rate, and the destination bit rates in each of the destination video attribute information are different;
  • the video transcoding system sends the transcoded at least one transcoded video resource to the Cache system for buffering, wherein each transcoded video resource in the at least one transcoded video resource has a destination bit rate;
  • the Cache system After the Cache system successfully caches at least one transcoded video resource, the Cache system sends the successfully cached information to the video transcoding system.
  • the Cache system deletes the transcoding task.
  • the Cache system provides video resources for the video transcoding system, and the video transcoding system returns the transcoded video resources that have been transcoded to the Cache system for caching, so that the Cache system realizes the buffering of the transcoded video data and makes full use of the video.
  • the cache space in the Cache system is not limited
  • the Cache system also obtains different video attribute information before transcoding, so the transcoding system can obtain different transcoding video resources based on the video resources that need to be transcoded and different video attribute information, that is, the Cache system is implemented. Cache of different video attribute information.
  • the video optimization system determines that the manner of returning the video resources to the client is changed accordingly.
  • the specific process is shown in FIG. 6, and the following steps are included in FIG. 6:
  • the client sends a video resource access request to the network server.
  • the video optimization system queries the Cache system whether to cache the video resource
  • the Cache system returns the code rate of all the transcoded video resources corresponding to the buffered video resource to the video optimization system;
  • the video optimization system determines the network congestion status between the current and the client
  • the video optimization system determines the current code rate that is adapted to the current network state according to the current network congestion state between the client and the client;
  • the video optimization system returns the transcoded video resource acquired in the Cache system to the client.
  • the video optimization system determines the transcoded video resource suitable for the current network congestion state based on the network congestion state with the client, and determines the video coding resource suitable for the current network congestion state.
  • the process of video resource transmission between clients improves the user experience.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • FIG. 7 is a flowchart of a video optimization method according to an embodiment of the present invention, where the method includes:
  • the video optimization system When the client sends a video resource access request to the video service provider, the video optimization system first queries whether the cache system caches the requested video resource. If the requested video resource is cached in the cache system, the video optimization system will retrieve the video resource. The video resources cached in the cache system.
  • the video resource cached in the video cache system includes at least one transcoded video resource, wherein different transcoded video resources support transmission in different network congestion states, and the video optimization system determines the video cache system.
  • the video optimization system determines the video cache system.
  • transcoded video resource having a resolution of 360P, a frame rate of 25, a codec format of H264, and a code rate of 732 kpbs;
  • a transcoded video resource having a resolution of 480P, a frame rate of 25, a codec format of H264, and a code rate of 1205 kpbs.
  • the video optimization system will detect the congestion state of the network between the current client and the client, and then select a transcoded video resource suitable for transmission in the current network congestion state based on the network congestion state. For example, when the network congestion is serious, the resolution is 240P. Transcoding video resources with a frame rate of 25, a codec format of H264, and a code rate of 322 kpbs; when the network congestion state is light, a transcoded video resource having a resolution of 480P, a frame rate of 25, a codec format of H264, and a code rate of 1205 kpbs is selected or Send source video resources directly.
  • FIG. 8 is a flowchart of a video caching method according to an embodiment of the present invention, where the method includes:
  • S802. Determine at least one destination video attribute information according to source video attribute information of the source video resource.
  • S803. Send source video resources, source video attribute information, and at least one destination video attribute information to a transcoding system.
  • the video caching system before S801, the video caching system further acquires the total number of accesses of each of the video resources that have been cached, and then uses the video resource whose total number of requests for request exceeds the threshold as the source video resource. In other words, video resources that are frequently requested will be used as video resources to be transcoded.
  • the source video resource source code rate is included in the source video attribute information, and of course, the resolution and format of the source video resource may also be included.
  • the information such as the frame rate and the compiled code format.
  • the video attribute information of the source video resource may be: resolution 720P, frame rate 25, video format FLV, and code rate 1367 kbps.
  • the video caching system acquires a rating parameter that characterizes the quality of the video resource by the user based on the obtained source video attribute information, and determines video attribute information representing the video resource attribute corresponding to the rating parameter that is greater than or equal to the threshold, and The determined video attribute information is used as the target video attribute information.
  • the user's quality rating of the video resource is saved in the QoE model, and the parameters saved by the QoE model are as shown in Table 2.
  • Each video attribute information in Table 2 corresponds to an experience score. The higher the score, the better the user experience of the video resource corresponding to the video attribute information.
  • the video caching system retrieves all the video attribute information of the experience score equal to 4 in Table 2, including the following video attribute information:
  • the video cache system will use the determined video attribute information as the destination video attribute information.
  • the video buffer system can send the source video resource to the cache system for video transcoding.
  • the video buffering system in order to prevent the video buffering system from blindly transmitting the source video resource to the video transcoding system, and increasing the processing pressure of the video transcoding system, or even the problem of failure, the video buffering system will transmit to the video transcoding system. Transmitting a transcoding request for the transcoding resource, the source video attribute information and the destination video attribute information are carried in the transcoding request, so that the video transcoding system can be based on the bit rate and the destination video attribute information in the source video attribute information. The code rate in it determines if there are enough transcoding resources.
  • the video caching system adjusts the transcoding task to the waiting state until the transcoding system has sufficient transcoding resources, and then performs the transcoding task. .
  • the video buffering system If the video buffering system receives the response information of the successful application of the transcoding resource returned by the video transcoding system, the video buffering system sends the source video resource to the video transcoding system.
  • If the source video attribute information sent by the video buffer system to the video transcoding system is: resolution 720P, frame rate 25, video format FLV, code rate 1367 kbps;
  • the destination video attribute information is:
  • the transcoded video resource received by the video caching system should be:
  • transcoded video resource having a resolution of 240P, a frame rate of 25, a codec format of H264, and a code rate of 322 kpbs;
  • transcoded video resource having a resolution of 360P, a frame rate of 25, a codec format of H264, and a code rate of 732 kpbs;
  • a transcoded video resource having a resolution of 480P, a frame rate of 25, a codec format of H264, and a code rate of 1205 kpbs.
  • the video caching system When the video caching system receives the transcoded video resource, the video caching system will cache these transcoded video resources.
  • the video buffering system further needs to apply for authentication to the video transcoding system, that is, the video optimization system generates an authentication request carrying the identification information, and Send the authentication request to the video transcoding system, if it receives the video transfer
  • the code system fails the response information
  • the transcoding task is terminated. If the video cache system is successfully authenticated, the transcoding task is continued.
  • the video cache system when the cached source video resource is frequently accessed in the video cache system, acquires source video attribute information of the source video resource and at least one destination video attribute information corresponding to the source video resource, and the source is The video resource, the source video attribute information, and the at least one destination video attribute information are sent to the video transcoding system, and then received at least one transcoded video resource returned by the video transcoding system, where the code rate of the transcoded video resource is smaller than the code of the source video resource. Rate, the final video caching system will cache transcoded video resources, which also improves the utilization of the video caching system.
  • FIG. 9 is a flowchart of a video transcoding method according to an embodiment of the present invention. , the method includes:
  • S901 Receive source video resources to be transcoded sent by the video buffer system, source video attribute information corresponding to the source video resources, and at least one destination video attribute information.
  • the video transcoding system When the video caching system needs to perform video transcoding, the video transcoding system will receive the information required for transcoding sent by the video caching system, wherein the destination video attribute information is a video that is encoded after the source video resource is transcoded.
  • the attribute information includes at least a code rate of the source video resource in the source video attribute information, and the target video attribute information includes a code rate of the transcoded video resource.
  • the video transcoding system first receives a transcoding request for requesting a transcoding resource sent by the video caching system, where the transcoding request carries source video attribute information and at least one destination video attribute information, at the source. Both the video attribute information and the destination video attribute information contain the code rate, so the video transcoding system determines whether there is enough in the current video transcoding system based on the source code rate of the source video attribute information and the destination bit rate in the destination video attribute information. Transcode resources to transcode.
  • the video transcoding system will send a response message to the video buffer system for successful transcoding resource application, and then the video transcoding system will receive the source sent by the video buffer system. Video resources.
  • the video transcoding system After the video transcoding system obtains the source video resource, the video transcoding system obtains the source code rate in the source video attribute information and the destination bit rate in each destination video attribute information, and the source video resource is obtained according to each destination bit rate. Transcoding into at least one transcoded video resource having a destination code rate, wherein one transcoded video resource has a code rate, and each transcoded video resource has a different target bit rate, so different transcoded video resources can Supports transmission under different network congestion conditions.
  • the video transcoding system transcodes the source video resource into at least one transcoded video resource, each transcoded video, based on the source video resource, the source video attribute information, and the at least one destination video attribute information sent by the video buffer system.
  • the resources all have a destination video attribute information, for example, transcoding the source video resource into a plurality of transcoded video resources having different code rates, and finally the video transcoding system sends all the transcoded video resources to the video buffer system for caching, so
  • the video transcoding system realizes transcoding of multiple video attributes of the source video resource, and the video transcoding system also realizes video transcoding of multiple code rates.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide functions for implementing the functions specified in one or more blocks of a flow or a flow and/or a block diagram of a flowchart step.

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  • Engineering & Computer Science (AREA)
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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Système et procédé d'optimisation de vidéo. Lorsque le système d'optimisation de vidéo reçoit une demande d'accès émise par un client et portant sur une ressource vidéo source, le système d'optimisation de vidéo détermine qu'au moins une ressource vidéo de transcodage correspondant à une ressource vidéo est placée en antémémoire dans un système d'antémémoire vidéo. En fonction d'un état actuel d'encombrement du réseau, le système d'optimisation de vidéo détermine, à partir du contenu de la ressource vidéo source et de la ou des ressources vidéo de transcodage, une ressource vidéo de transcodage apte à une émission dans l'état actuel d'encombrement du réseau, et envoie la ressource vidéo de transcodage obtenue au client. Le système d'optimisation de vidéo envoie ainsi au client des ressources vidéo de transcodage présentant des débits binaires différents suivant différents états d'encombrement du réseau, c.à.d. que lorsque l'encombrement du réseau est sévère, une ressource vidéo de transcodage présentant un faible débit binaire est envoyée, et lorsque l'état d'encombrement du réseau est léger, une ressource vidéo de transcodage présentant un débit binaire élevé est envoyée. Une ressource vidéo plus régulière peut ainsi être transmise au client, et l'agrément d'utilisation est également amélioré.
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