CN109089175A - A kind of method and device that video cache accelerates - Google Patents
A kind of method and device that video cache accelerates Download PDFInfo
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- CN109089175A CN109089175A CN201710446356.1A CN201710446356A CN109089175A CN 109089175 A CN109089175 A CN 109089175A CN 201710446356 A CN201710446356 A CN 201710446356A CN 109089175 A CN109089175 A CN 109089175A
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/858—Linking data to content, e.g. by linking an URL to a video object, by creating a hotspot
- H04N21/8586—Linking data to content, e.g. by linking an URL to a video object, by creating a hotspot by using a URL
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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
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
-
- 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
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
-
- 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
- H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
-
- 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
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
-
- 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
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/858—Linking data to content, e.g. by linking an URL to a video object, by creating a hotspot
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Information Transfer Between Computers (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a kind of video cache accelerating method and devices, it is related to technical field of network communication, the described method includes: obtaining the constant part of the URL information for identifying video resource in the video playing request after the request of Client-initiated video playing；According to the constant part of the URL information, the local video resource for whether having cached the user and having requested broadcasting is determined；If it is determined that the local uncached user requests the video resource played, then requested to obtain the complete video resource from ICP's server according to the video playing, and carry out local cache to the complete video resource.The present invention is able to ascend service rate, reduces operator and goes out net flow.
Description
Technical field
The present invention relates to technical field of network communication, in particular to a kind of method and device of video cache acceleration.
Background technique
Go out net flow to reduce operator, save inter-network settlement expense, generally there is the high speed of oneself in current each operator
Buffer storage (cache) system, having an important network element in cache system is exactly that video cache accelerates server subsystem
System.
When user plays internet video resource, the video request of user (i.e. ask by video resource request or video playing
Ask) can local domain name system (Domain Name System, LDNS) Jing Guo operator oneself or light splitting kidnap server network
Server network element is kidnapped in member, LDNS or light splitting can be dispatched to the video request of user video cache acceleration server subsystem.
Some producers carry out abduction caching to video resource request to ICP in order to prevent, can ask in video
Door chain function is added in the uniform resource locator (Uniform Resource Locator, URL) asked, user plays every time
Identical video resource, the URL format of request all can be different.Therefore how it is directed to the video request using variable URL rule
Caching is carried out to the video resource of request and is accelerated as urgent problem to be solved.
Summary of the invention
The method and device that a kind of video cache provided in an embodiment of the present invention accelerates, for using variable URL rule
Video request solves the caching acceleration problem of requested video resource.
The method that a kind of video cache provided according to embodiments of the present invention accelerates, comprising:
After the request of Client-initiated video playing, obtains and be used to identify video resource in the video playing request
The constant part of URL information；
According to the constant part of the URL information, the local view for whether having cached the user and having requested broadcasting is determined
Frequency resource；
If it is determined that the local uncached user requests the video resource played, then requested according to the video playing
The complete video resource is obtained from ICP's server, and the complete video resource is carried out local
Caching.
Preferably, the constant portion for obtaining the URL information for identifying video resource in the video playing request
Divide and includes:
It can be changed URL rule according to the video resource prestored, extract the URL information not from video playing request
Become part.
Preferably, the constant part according to the URL information determines that locally whether having cached user's request broadcasts
The video resource put includes:
Using the constant part of the URL information as the keyword of the video resource；
The keyword of the video resource is matched with the keyword of the video resource of local cache, and according to matching
As a result, determining the local video resource for whether having cached the user and having requested broadcasting.
Preferably, described complete described from the acquisition of ICP's server according to video playing request
Video resource includes:
The dragging parameter in the video playing request is deleted, and has been obtained from ICP's server
The whole video resource.
Preferably, after determining the local video resource for whether having cached user's request broadcasting, further includes:
If it is determined that the local video resource for having cached the user and having requested broadcasting, then obtain in the video playing request
Parameter is pulled, and the video resource is obtained from local cache according to the dragging parameter, sends the user to.
The storage medium provided according to embodiments of the present invention stores the method accelerated for realizing above-mentioned video cache
Program.
The device that a kind of video cache provided according to embodiments of the present invention accelerates, comprising:
Data obtaining module, for after the request of Client-initiated video playing, obtaining in the video playing request
For identifying the constant part of the URL information of video resource；
Determining module is cached, for the constant part according to the URL information, determines locally whether cached the user
Request the video resource played；
Caching obtains module, for when determining that the local uncached user requests the video resource played, root
The complete video resource is obtained from ICP's server according to video playing request, and to described complete
Video resource carry out local cache.
Preferably, the data obtaining module can be changed URL rule according to the video resource prestored, ask from the video playing
Seek the middle constant part for extracting the URL information.
Preferably, the caching determining module is using the constant part of the URL information as the key of the video resource
Word, and the keyword of the video resource is matched with the keyword of the video resource of local cache, according to matching result,
Determine the local video resource for whether having cached the user and having requested broadcasting.
Preferably, the caching obtains module and deletes dragging parameter in video playing request, and from the interconnection
Net content provider server obtains the complete video resource.
Preferably, the caching obtains module and is also used in the video resource for locally having cached user's request broadcasting
When, the dragging parameter in the video playing request is obtained, and the view is obtained from local cache according to the dragging parameter
Frequency resource sends the user to.
Technical solution provided in an embodiment of the present invention has the following beneficial effects:
The present invention implements that intellectual analysis processing can be carried out to the variable URL rule in the request of the video playing of user, and
By video playing request in can be changed the corresponding video resource of URL rule and carry out caching acceleration, be able to ascend service rate, reduce fortune
Battalion quotient goes out net flow.
Detailed description of the invention
Fig. 1 is the method flow diagram that video cache provided in an embodiment of the present invention accelerates；
Fig. 2 is the device block diagram that video cache provided in an embodiment of the present invention accelerates；
Fig. 3 is cache video cache acceleration system group-network construction schematic diagram；
Fig. 4 is that video cache accelerates service of subsystem processing flow schematic diagram.
Specific embodiment
Below in conjunction with attached drawing to a preferred embodiment of the present invention will be described in detail, it should be understood that described below is excellent
Select embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Fig. 1 is the method flow diagram that video cache provided in an embodiment of the present invention accelerates, as shown in Figure 1, step includes:
Step S101: it after the request of Client-initiated video playing, obtains and is used to identify in the video playing request
The constant part of the URL information of video resource.
Wherein, video playing request includes URL information, and the URL information includes the constant portion for identifying video resource
Point and the variable part with door chain function.The constant part for identifying video resource includes the video of user's request
The title of resource.
In step s101, URL rule can be changed according to the video resource prestored, extracts institute from video playing request
URL information is stated, what the present embodiment mainly extracted is the constant part of the URL information.
Step S102: according to the constant part of the URL information, determine that locally whether having cached the user requests to play
Video resource.Specifically, using the constant part of the URL information as the keyword of the video resource, and will be described
The keyword of the video resource of the keyword and local cache of video resource is matched, if there are matched passes in local cache
Key word then illustrates locally to have cached the corresponding video resource of the keyword, if matched keyword is not present in local cache,
Illustrate the corresponding video resource of local uncached keyword.
Step S103: it if it is determined that the local uncached user requests the video resource played, is then broadcast according to the video
Put request and obtain the complete video resource from ICP's server, and to the complete video resource into
Row local cache.Specifically, delete the dragging parameter in video playing request, and from the ICP
Server obtains the complete video resource.
Further, after determining the local video resource for whether having cached user's request broadcasting, further includes: if
It determines the local video resource for having cached the user and having requested broadcasting, then obtains the dragging parameter in the video playing request,
And the video resource is obtained from local cache according to the dragging parameter, send the user to.
As a preferred embodiment, step S103 obtains complete video resource using first playing request, specifically, sentencing
The video playing of breaking request whether be the video resource first playing request, if judgement is the of the video resource
One playing request is then deleted the dragging parameter in the video playing request, and is serviced from the ICP
Device obtains the complete video resource, that is to say, that the embodiment of the present invention, can will be same when user requests to play video resource
Dragging parameter in first video playing request of one video resource (can be indicated to play the parameter of range, such as be risen
Beginning location parameter and end position parameter) it deletes, then go source station (i.e. ICP's server) to obtain complete view
Frequency resource is simultaneously cached to local.In this way, video cache accelerates server when subsequent user requests to play the video resource
The video resource of local cache text is directly obtained according to the dragging parameter in request, and is provided a user video cache and accelerated clothes
Business.And when video playing request is not first playing request of the video resource, then video playing request is stated in reservation
In dragging parameter, and by ICP's server according to pull parameter transmission video resource pass through use
Family.
It will appreciated by the skilled person that implement the method for the above embodiments be can be with
Relevant hardware is instructed to complete by program, the program can store in computer-readable storage medium, should
Program when being executed, including step S101 to step S103.Furtherly, the present invention can also provide a kind of storage medium,
On be stored with computer program, when which is executed by processor at least realize step S101 to step S103.Wherein, described
Storage medium may include ROM/RAM, magnetic disk, CD, USB flash disk.
Fig. 2 is the device block diagram that video cache provided in an embodiment of the present invention accelerates, as shown in Figure 2, comprising: acquisition of information
Module 21, caching determining module 22 and caching obtain module 23.
Data obtaining module 21, for after the request of Client-initiated video playing, obtaining in the video playing request
For identify video resource URL information constant part.
Determining module 22 is cached, for the constant part according to the URL information, determines locally whether cached the use
The video resource that family request plays.
Caching obtains module 23, for when determining that the local uncached user requests the video resource played, according to
The video playing request obtains the complete video resource from ICP's server, and to described complete
Video resource carries out local cache.
The workflow of described device includes: when video cache accelerates server to receive the request of Client-initiated video playing
Afterwards, data obtaining module 21 can be changed URL rule according to the video resource prestored, from video playing request described in extraction
The constant part of URL information.Determining module 22 is cached using the constant part of the URL information as the key of the video resource
Word, and the keyword of the video resource is matched with the keyword of the video resource of local cache, if it does, explanation
The local video resource for having cached the user and having requested broadcasting, caching obtains module 23 and obtains in the video playing request at this time
Dragging parameter, and the video resource is obtained from local cache according to the dragging parameter, sends the user to；If
It mismatches, illustrates that the local uncached user requests the video resource played, caching acquisition module 23 is deleted described at this time
Dragging parameter in video playing request, and the complete video money is obtained from ICP's server
Source.
As a preferred embodiment, caching, which obtains module 23, may determine that whether the video playing request is the video money
First playing request in source then deletes the dragging ginseng in the request if first playing request of the video resource
Number, to obtain the complete video resource from ICP's server, and complete in local cache
The video resource provides service to the user after caching；If not first playing request of the video resource, then protect
The dragging parameter in the request is stayed, and by ICP's server according to the institute of the dragging parameter transmission
It states video resource and passes through the user.Wherein, first playing request of the video resource refers to receives sequentially in time
Since first playing request arrived may be for requesting playing playing start time point 0 second for the video resource
Request, it is also possible to the request played since other play times.It should be noted that in the preferred embodiment, when
When local uncached video resource, it is only necessary to according to first playing request, carry out deleting dragging parameter and obtain complete video
The operation of resource, and during obtaining complete video resource, does not need further according to the other playing requests being successfully received, into
Row, which is deleted, pulls parameter to obtain the operation of complete same video resource, not only saves Internet resources, but also view can be improved
The caching speed of frequency resource.It should be further noted that in the preferred embodiment, being received during obtaining complete video resource
When to other playing requests, the video resource segment transparent transmission that will be obtained according to parameter is pulled from ICP's server
To user, when receiving other playing requests after caching complete video resource, will be obtained according to parameter is pulled from local server
The video resource segment obtained sends user to, to promote the service rate to user.
The embodiment of the present invention carries out intellectual analysis processing to internet video resource request URL rule, realizes video cache
Accelerate.
The present embodiment provides the devices that a kind of video cache accelerates, comprising:
Processor, for after the request of Client-initiated video playing, obtaining the unified money in the video playing request
Source finger URL URL information, and according to the URL information, determine the local video money for whether having cached the user and having requested broadcasting
Source, however, it is determined that the local uncached user requests the video resource played, then is requested according to the video playing from internet
Content provider server obtains the complete video resource, and carries out local cache to the complete video resource；
Memory is coupled with the processor, the program that storage is executed for the processor thereon.
Fig. 3 is cache video cache acceleration system group-network construction schematic diagram, as shown in figure 3, the video that client is sent is asked
It asks by office side's local domain name system (Local DNS, LDNS) server, hardware load is redirected in address by LDNS server
Video request is distributed to (the i.e. video cache acceleration service of each video cache server by balanced device, hardware load balancer
Device), video cache server judges whether the buffered video resource, if the buffered video resource, video cache
Server directly provides the user with service；If not caching the video resource, video cache server will be to internet content
Provider server initiates video request, and the video resource of ICP is cached to local video cache and is accelerated
Server simultaneously provides services to the user.
Specifically, video cache acceleration server subsystem (or abbreviation video cache accelerates server, video cache to add
Fast subsystem) according to the corresponding variable URL rule of the video resource of different ICPs configuration, the main function of the rule
Can delete the variable part video request URL, analysis extracts part constant in video request URL and closes as video cache
Key word (key) needs artificially httpwatch tool to be utilized to carry out since the variable URL rule of video has video playing characteristic
A large amount of analyses, find out the part URL for identifying entire resource.
Video request can generally carry the video draggings parameter such as start, begin, end or range, the dragging of video request
Parameter is generally in the argument section of URL or the message header of video request.When user requests to play video resource, video is slow
It deposits and accelerates server subsystem that can delete the dragging parameter in first video request of the same video resource, then go mutually
Entire video resource is cached on local server by networking content provider server.In this way, video cache accelerates server
Subsystem is after being successfully received user video request, so that it may according to the dragging parameter in user video request, in local
Corresponding cache file is found on server, and is read corresponding video content and provided the user with service.
Fig. 4 is that video cache accelerates service of subsystem processing flow schematic diagram, as shown in figure 4, step includes:
Step S4001: terminal user initiates video playing request.
Step S4002: it can be changed URL in video cache accelerator system configuration ICP's video resource in advance
Rule.
Step S4003: when video cache accelerates subsystem to receive http video request, can match video first be can be changed
URL rule.
Step S4004: video cache accelerates subsystem to can be changed in URL Rule Extraction user video request URL according to video
Constant part is as video cache key.
Step S4005: video cache accelerate subsystem according to video cache key judge local whether the buffered video
Resource walks step S4006 if the buffered video resource；Step S4007 is walked if not caching the video resource.
Step S4006: video cache accelerates subsystem according to user video request URL and pulls parameter, reads local slow
It deposits file data and provides the user with service.
Step S4007: the first time that video cache accelerates subsystem to judge whether it is video resource requests, if it is video
Step S4008 is then walked in the first time request of resource；Step S4009 is then walked in first time request if not video resource.
Step S4008: when video cache accelerates subsystem to go back to source to ICP's server, by video dragging
Parameter is deleted, and entire video resource is buffered in local server and provides the user with service.
Step S4009: it when video cache accelerates subsystem to go back to source to ICP's server, carries video and drags
Parameter is dragged, corresponding video resource segment is passed through into family, service is provided.
The video cache of the embodiment of the present invention accelerates subsystem that can carry out at intellectual analysis to video request URL rule
Reason draws the corresponding complete video resource of different URL rule of user's request to local from ICP's server,
It is buffered in video cache and accelerates server subsystem.When there is user to play identical video resource again, video cache accelerates
Server subsystem can hit local server resource and directly provide the user with Video service, not need outgoing access again
The video resource of ICP improves service rate, while also reducing out net flow for operator.
Although describing the invention in detail above, but the invention is not restricted to this, those skilled in the art of the present technique
It can be carry out various modifications with principle according to the present invention.Therefore, all to be modified according to made by the principle of the invention, all it should be understood as
Fall into protection scope of the present invention.
Claims (10)
1. a kind of video cache accelerated method, comprising:
After the request of Client-initiated video playing, the unification for being used to identify video resource in the video playing request is obtained
The constant part of Resource Locator URL information；
According to the constant part of the URL information, the local video money for whether having cached the user and having requested broadcasting is determined
Source；
If it is determined that the local uncached user requests the video resource played, then requested according to the video playing from mutual
Content provider server of networking obtains the complete video resource, and carries out to the complete video resource local slow
It deposits.
2. according to the method described in claim 1, described obtain is used to identify video resource in the video playing request
The constant part of URL information includes:
It can be changed URL rule according to the video resource prestored, the constant portion of the URL information extracted from video playing request
Point.
3. according to the method described in claim 1, the constant part according to the URL information, determines local whether delayed
Depositing the video resource that user's request plays includes:
Using the constant part of the URL information as the keyword of the video resource；
The keyword of the video resource is matched with the keyword of the video resource of local cache, and is tied according to matching
Fruit determines the local video resource for whether having cached the user and having requested broadcasting.
4. according to the method described in claim 1, described service according to video playing request from ICP
Device obtains the complete video resource
The dragging parameter in the video playing request is deleted, and is obtained completely from ICP's server
The video resource.
5. method according to claim 1-4 is determining that locally whether having cached the user requests broadcasting
After the video resource, further includes:
If it is determined that the local video resource for having cached the user and having requested broadcasting, then obtain the dragging in the video playing request
Parameter, and the video resource is obtained from local cache according to the dragging parameter, send the user to.
6. a kind of video cache accelerator, comprising:
Data obtaining module is used for for after the request of Client-initiated video playing, obtaining in the video playing request
Identify the constant part of the uniform resource position mark URL information of video resource；
Determining module is cached, for the constant part according to the URL information, determines locally whether cached user's request
The video resource played；
Caching obtains module, for when determining that the local uncached user requests the video resource played, according to institute
It states video playing request and obtains the complete video resource from ICP's server, and to the complete view
Frequency resource carries out local cache.
7. device according to claim 6, the data obtaining module can be changed URL rule according to the video resource prestored,
The constant part of the URL information is extracted from video playing request.
8. device according to claim 6, the caching determining module is using the constant part of the URL information as described in
The keyword of video resource, and by the keyword of the keyword of the video resource and the video resource of local cache carry out
Match, according to matching result, determines the local video resource for whether having cached the user and having requested broadcasting.
9. device according to claim 6, the caching, which obtains the dragging that module is deleted in the video playing request, joins
Number, and the complete video resource is obtained from ICP's server.
10. the caching acquisition module is also used to cache in local described according to claim 6-9 described in any item devices
When user requests the video resource played, the dragging parameter in the video playing request is obtained, and according to the dragging parameter
The video resource is obtained from local cache, sends the user to.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446356.1A CN109089175B (en) | 2017-06-14 | 2017-06-14 | Video cache acceleration method and device |
| RU2019143702A RU2738447C1 (en) | 2017-06-14 | 2018-06-04 | Video caching method and video caching device |
| PCT/CN2018/089821 WO2018228234A1 (en) | 2017-06-14 | 2018-06-04 | Video caching method and video caching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446356.1A CN109089175B (en) | 2017-06-14 | 2017-06-14 | Video cache acceleration method and device |
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| CN109089175A true CN109089175A (en) | 2018-12-25 |
| CN109089175B CN109089175B (en) | 2022-04-22 |
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| CN201710446356.1A Active CN109089175B (en) | 2017-06-14 | 2017-06-14 | Video cache acceleration method and device |
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| CN (1) | CN109089175B (en) |
| RU (1) | RU2738447C1 (en) |
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| CN112423146A (en) * | 2019-08-21 | 2021-02-26 | 亦非云互联网技术（上海）有限公司 | Playing data acquisition and pushing method, system, medium, server and playing terminal |
| CN112738148A (en) * | 2019-10-28 | 2021-04-30 | 中兴通讯股份有限公司 | Batch deletion method, device and equipment for cache content and readable storage medium |
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| CN113163226B (en) * | 2021-03-26 | 2023-04-07 | 维沃移动通信有限公司 | Media file playing method and device, electronic equipment, server and medium |
| CN116033187A (en) * | 2023-01-05 | 2023-04-28 | 北京奇艺世纪科技有限公司 | Video processing system, method, device, electronic equipment and storage medium |
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| CN112738148B (en) * | 2019-10-28 | 2024-05-14 | 中兴通讯股份有限公司 | Batch deletion method, device and equipment of cache content and readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2738447C1 (en) | 2020-12-14 |
| WO2018228234A1 (en) | 2018-12-20 |
| CN109089175B (en) | 2022-04-22 |
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