CN101252546B - Method and apparatus for migrating medium stream online service - Google Patents
Method and apparatus for migrating medium stream online service Download PDFInfo
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- CN101252546B CN101252546B CN2008101040867A CN200810104086A CN101252546B CN 101252546 B CN101252546 B CN 101252546B CN 2008101040867 A CN2008101040867 A CN 2008101040867A CN 200810104086 A CN200810104086 A CN 200810104086A CN 101252546 B CN101252546 B CN 101252546B
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Abstract
The invention provides a method and a device for media stream on-line service transferring. The method mainly includes that a load balancer sends a service transferring message to a first stream media server providing media stream service for a user, wherein the first stream media server stops providing media stream service for the user according to the position information of the data packet indicated in the service transferring message; the load balancer sends a media stream operation request to a second stream media server and the second media server provides media stream service for the user according to the position information of the data packet indicated in the media stream operation request. By the invention, the media streams are transferred from the current service node to the appointed service node in the service process, thereby dynamic load balancing service is realized and the utility rate of system resources is improved.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of method and apparatus of migrating medium stream online service.
Background technology
In recent years, along with the raising of the network bandwidth and the increase of userbase, broadband network and various new business have obtained very big development.IPTV (IPTV) more and more comes into one's own as the business of new generation in the broadband network, and IPTV has represented the professional developing direction of novel video transmission of IP based network.In IPTV; Mainly guarantee reliable transmission quality and perfect display effect through core components such as streaming media servers; Streaming media server is being undertaken the storage of video file; With with video file with stream mode be pushed to the task of going in the network, therefore, streaming media server needs very high Performance And Reliability requirement.
Single streaming media server is difficult to satisfy demands such as the professional data processing amount of IPTV is big, data throughout is high, video playback real-time, client's connection request number is big, the connect hours is long.In order to improve the Performance And Reliability of streaming media server; The main at present stream media server system that adopts the loose couplings trunking mode of load balancing; A kind of structural representation of this stream media server system is as shown in Figure 1, and the handling process of a kind of basic Media Stream program request in this stream media server system is as shown in Figure 2.Concrete processing procedure is following:
Subscription client at first sends Media Stream Operation (operation) request to RTSP (Real-Time StreamingProtocol, the real-time stream media protocol) agency who is arranged on the load equalizer, and this operation comprises: Option (selection); Describe (description); Setup (foundation), Play (broadcast), Pause (time-out); Teardown RTSP methods such as (downloads), the RTSP agency is transmitted to streaming media server with the Media Stream operation requests that receives.After streaming media server is handled the Media Stream operation requests that receives, return Media Stream operation response to the RTSP agency, the RTSP agency is transmitted to subscription client again with the Media Stream operation response that receives.Whole stream media server system (streaming media server that comprises load equalizer and backstage) externally only shows an ip address (being Rtsp agency's ip address).
In media server system, it is service that user/application program is mapped to the demand of Media Stream.Adopt the media server system of trunking mode mainly to exist following two problems:
1, on each streaming media server node, during irrational distribution, can cause that the Media Stream service distribution is unreasonable, thereby cause part streaming media server generation performance bottleneck when media content.
Even 2 media contents are irrational distribution on each streaming media server node; But because request scheduling technology imperfection and user stop operations such as stream service; Also can cause the unreasonable of Media Stream service distribution, cause part streaming media server generation performance bottleneck.
In group system, the migrating technology of research is a process migration at present.In the process running, according to the loading condition of system,, process continues operation through being transferred to the lighter node of another load from the heavier node of load, can effectively realize dynamic load balancing.The process migration technology makes dynamic dispatching become possibility.But because the present overwhelming majority uses is service-oriented, adopts process migration inappropriate often.Service is provided such as server A through 5 threads creating to 5 users, if through process migration this process migration on server B, then 5 users need all migrations to walk.But the progress that 5 users possibly play is different, and group system possibly only need user of migration, just can reach balance of load.
Summary of the invention
The purpose of the embodiment of the invention provides a kind of method and apparatus of migrating medium stream online service, thereby can solve the problem that the method that has process migration now will cause the streamed interruption of medium.
The purpose of the embodiment of the invention realizes through following technical scheme:
A kind of method of migrating medium stream online service comprises:
Load equalizer is to providing the first-class media server of Media Stream service to send services migrating message to the user; Said first-class media server is according to the positional information of the packet of indicating in the said services migrating message; Stop to said user the Media Stream service being provided, the positional information of described packet comprises: sequence of data packet number in the corresponding sample sequence of Frame number and this sampling;
Said load equalizer is set up operation to the Media Stream that second streaming media server sends position, Media Stream isochronous resources, time migration and the user profile of carrying packet; Session processing module in said second streaming media server receives said Media Stream and sets up operation, and positional information, Media Stream isochronous resources and the time migration information of said packet is sent to the fluidization treatment module in said second streaming media server;
Said session processing module is returned the response that Media Stream is set up operation to said load equalizer; Said fluidization treatment module is obtained corresponding medium stream information from said Media Stream isochronous resources; From the time of said time migration indication, send Media Stream to said user according to the positional information of packet.
A kind of load equalizer comprises:
Serve the module of moving out; Be used for to the service that provides the first-class media server of Media Stream service to send the positional information of the carrying packet message of moving out to the user; The positional information of described packet comprises: sequence of data packet number in the corresponding sample sequence of Frame number and this sampling; Said first-class media server stops to the user Media Stream service being provided according to the positional information of the packet that carries in the said services migrating message;
Serve the module of moving into; Be used for sending the Media Stream operation requests of position, Media Stream isochronous resources, time migration and the user profile of carrying packet to second streaming media server; So that said second streaming media server obtains corresponding medium stream information according to the said Media Stream isochronous resources that carries in the said Media Stream operation requests; From the time of said time migration indication, send Media Stream to said user according to the positional information of said packet.
A kind of streaming media server comprises:
The services migrating message resolution module; Be used for the services migrating message that the balancing received load device sends; This services migrating message is resolved; Obtain the positional information of the packet that carries in the said services migrating message, this positional information is passed to the service implementing module of moving out, the positional information of described packet comprises: sequence of data packet number in the corresponding sample sequence of Frame number and this sampling;
The service implementing of moving out module when being used for reaching in the position of the packet that sends to the user positional information that said services migrating message resolution module obtained, stops to the user Media Stream service being provided.
A kind of streaming media server comprises:
Media Stream operation requests parsing module; The Media Stream operation requests that is used for the position of carrying packet, Media Stream isochronous resources, time migration and the user profile of the transmission of balancing received load device; This Media Stream operation requests is resolved; Obtain positional information, Media Stream isochronous resources, time migration and the user profile of the packet that carries in the said Media Stream operation requests, and pass to the service implementing module of moving into;
The service implementing of moving into module; Be used for the information that passed over according to said Media Stream operation requests parsing module; Obtain corresponding medium stream information from said Media Stream isochronous resources; From the time of said time migration indication, send Media Stream to said user according to the positional information of packet.
Description of drawings
Technical scheme by the invention described above embodiment provides can be found out; The present invention can make Media Stream in service process; From current service node real-time migration to the service specified node, thereby realize dynamic load balancing service, improve usage factor of system resource.
Fig. 1 is a kind of structural representation of existing stream media server system;
Fig. 2 is the process chart of a kind of basic Media Stream program request in the existing stream media server system;
Fig. 3 is for being example with the stream media server system that has adopted load equalizer, the process chart of the method for the migrating medium stream online service that the embodiment of the invention proposes;
The concrete process chart that Fig. 4 moves out for the Media Stream service that the embodiment of the invention proposes;
The concrete process chart that Fig. 5 moves into for the Media Stream service that the embodiment of the invention proposes;
Fig. 6 is the structural representation of the embodiment of load equalizer provided by the invention;
Fig. 7 is the structural representation of the embodiment of a kind of streaming media server provided by the invention;
Fig. 8 is the structural representation of the embodiment of another kind of streaming media server provided by the invention.
Embodiment
In embodiments of the present invention, the notion of online service migration has been proposed, services migrating be meant service from the current service node motion to the service specified node.That is to say that each server node in the streaming media server group system no longer is an isolated node, but an organic part in the whole system.And in the process of carrying out services migrating, can guarantee that Media Stream does not interrupt, client is not had any impact.
With the stream media server system that has adopted load equalizer is example, and the handling process of the method for the Media Stream services migrating that the embodiment of the invention proposes is as shown in Figure 3, comprises following treatment step:
Step 31, user terminal at first send Media Stream Operation (operation) request to the RtspProxy (RTSP agency) that is arranged on the load equalizer; This operation comprises: Option; Describe; Setup, RTSP methods such as Play, RtspProxy is transmitted to the source and course media server with the Media Stream operation requests that receives.After the source and course media server is handled the Media Stream operation requests that receives, return Media Stream operation response to the RTSP agency, RtspProxy is transmitted to subscription client again with the Media Stream operation response that receives.
Step 32, when load equalizer is found the big or Media Stream irrational distribution of the duty ratio of above-mentioned source and course media server; Decision transmits service with the Media Stream of providing for above-mentioned user terminal on this source and course media server, moves to other and institute's requested service can be provided and load is low weight or can make Media Stream distribute more reasonably on the streaming media server.So load equalizer is selected a reasonable target streaming media server according to the loading condition of each streaming media server.
RtspProxy sends Handoff (migration) order to the source and course media server; After the source and course media server is handled above-mentioned Handoff order; Return the response of Handoff order to load equalizer; Thereby realize moving out of Media Stream service, the concrete handling process that this Media Stream service is moved out is as shown in Figure 4, and concrete processing procedure is:
In streaming media server, the Frame of a Media Stream at first is packaged into a sample (sampling), and this sample is divided into a plurality of packet (bag) again, sends to user terminal through the rtp agreement then.Therefore, can orient the particular location of each bag, in services migrating, can granularity be accurate to a bag like this through sampleSeq (sample sequence number)+packetSeq (packet number).
RtspProxy is when the decision migration service; RtspSession on the source and course media server (session processing) module is sent Handoff (migration) order; The RtspSession module is one of nucleus module of streaming media server, and its major function is a maintain customer and different conditions during server is connected, and these different state are made corresponding reaction; For example user's request analysis the time, the function analysis request that its can call request be resolved.Above-mentioned Handoff order comprises following parameter:
Handoff: be used for representing that this is a Handoff order.
CSeq: being used for expression need to keep increasing progressively successively.
Session: be used for representing session id.
SampleNum, PacketNum: be used for representing sampling numerical value and bag numerical value, after these two fields represent to receive the HandoffStop order, send data through what frames and the end of bag back, two fields need to be provided with simultaneously.
Optional parameters:
Interval: after being used for representing to receive the Handoff order, through how long the back finishes to send data, this parameter is granularity with frame.
The RtspSession module is after receiving migration " Handoff " order, and at first whether inspection migration order is effective, if effectively, then send a notification message through calling QTRTPFile (fluidization treatment) module of newly-increased interface function on the source and course media server.The QTRTPFile module is one of nucleus module of streaming media server, and its major function is a packet with the media file fluidisation, and packet is sent to other calling module.Carry the SampleNum that comprises in the above-mentioned Handoff order in the above-mentioned notification message, PacketNum, and Interval parameter information.
After the QTRTPFile module receives above-mentioned notification message, according to above-mentioned SampleNum, PacketNum; And Interval parameter information; Orient the position of concrete Frame and packet, behind this position, stop to send packet to the user at the packet that sends to the user.The RtspSession module is also according to above-mentioned SampleNum, PacketNum, and Interval parameter information, and the position of orienting concrete Frame and packet, and send the Handoff response message of carrying this positional information to RtspProxy.
Above-mentioned Handoff Response order comprises following parameter:
R: being used for expression moves out and serves successfully;
Cseq: be used for representing corresponding C seq;
Session: be used for representing session id;
SSRCV: the SSRC that is used for representing video track;
TimeStampOffsetV: be used for the initial offset that express time stabs;
SSRCA: the SSRC that is used for representing audio frequency track;
TimeStampOffsetV: be used for the initial offset that express time stabs;
SampleSeqA: the sequence number that is used for representing the residing sample of next packet;
PacketSeqA: the sequence number that is used for representing next packet;
PacketCount: be used for representing the number of data packets of sending;
ByteCount: be used for representing the byte number that sends
PlayTime: the system clock time that is used for representing to represent source server;
Under the situation of makeing mistakes in Handoff order position invalid or locator data frame and packet, the Handoff Response that the RtspSession module sends to RtspProxy orders the parameter that comprises to be:
N: being used for expression mistake occurs.
Step 33, after the RtspProxy in the load equalizer receives above-mentioned Handoff Response order of carrying the successful parameter of service of moving out; Send the Media Stream operation requests to above-mentioned object flow media server; After the object flow media server is handled the Media Stream operation requests that receives; Return Media Stream operation response to RtspProxy, the service of realization Media Stream is moved into.Then, the object flow media server replaces above-mentioned source and course media server to send Media Stream to the user.The concrete handling process that above-mentioned Media Stream service is moved into is as shown in Figure 5, and concrete processing procedure is:
The Media Stream service moved into be used as a new order request; The RtspProxy elder generation RtspSession module in the object flow media server respectively sends Option; The Describe operation, the object flow media server returns Option to RtspProxy, the response of Describe operation.Then; The Setup order of RtspProxy after the object flow media server sends expansion; In the TransportHeader of Setup order, add following parameter: SSRC (isochronous resources, Synchronization source), SampleSeq, PacketSeq, TimeStampOffset (time migration), ClientIP, PacketCount (message number), byteCount (byte number), playTime (reproduction time).Be put into these parameters.
RtspSession is after the Setup order that receives above-mentioned expansion; ParseTransportHeader () function through expansion obtains the above-mentioned parameter value in the Setup order of this expansion; According to SampleSeq, PacketSeq, TimeStampOffset parameter information; Orient the position of concrete Frame and packet, this position is the original position of object flow media server to the packet of the Media Stream of user's transmission.QTRTPFile module in the object flow media server is sent this positional information, the value of time migration and the value of SSRC, returns Setup order corresponding of above-mentioned expansion to RtspProxy.Then, the RtspSession module of RtspProxy in the object flow media server sent the Play operation, and the RtspSession module is returned the corresponding of Play operation to RtspProxy.The Media Stream service process of moving into finishes.
Afterwards, the QTRTPFile module in the object flow media server is obtained medium stream information from isochronous resources, from the time of said time migration indication, sends Media Stream according to the positional information of packet to said user.
The structural representation of the embodiment of load equalizer provided by the invention is as shown in Figure 6, comprises like lower module:
Serve the module of moving out; Be used for serving the message of moving out to providing the first-class media server of Media Stream service to send to the user; Said first-class media server stops to the user Media Stream service being provided according to the positional information of the packet of indicating in the said services migrating message;
Serve the module of moving into, be used for sending the Media Stream operation requests to second streaming media server, said second streaming media server provides the Media Stream service according to the positional information of the packet of indicating in the said Media Stream operation requests to said user.
The embodiment of the invention relates to the modification of convection media server, mainly comprises the modification of three aspects such as message parse, message transmission and function realization.For the message parse part, its receives the RTSP request, resolves the field parameter that makes new advances and add, and according to the rule of streaming media server, it is kept in the related data structure; For Message Transfer Part, it adds a whole set of new Handoff processing of request flow process according to existing RTSP process of commands flow process, comprises Parameter Extraction and setting, the field splicing of response message; For the function implementation part, realize stopping to play the function of perhaps playing behind the x frame from certain packet start according to the parameter that passes over.Introduce modification below respectively to these three parts.
(1) message parse part: comprise " moving out " and " moving into " two cover message parses.The entrance of message parse process is all in Server.tproj/RTSPRequest.cpp.For the message parse of " moving out ", at first resolve first row of RTSP request, comprise Method (method), URI (unified resource sign) and Version (version).Resolve corresponding request header then, but in the function of analysis request head, need to add statement, resolving the value of HANDOFF request header and sampleNum, packetNum, interval, and they are deposited in the dictionary.Message parse for " moving into "; In the function of analysis request head; Need to add statement resolving the HANDOFF head, the value of taking out HANDOFF header and sampleSeq, packetSeq, timestampOffset, seqOffset and ssrc, and they are deposited in the dictionary.
(2) Message Transfer Part: this part also comprises the corresponding message passing mechanism of " moving out " and " moving into " two covers.The entrance of message process is arranged in APIModules/QTSSFileModule/QTSSFileModule.cpp at file.Message Transfer Part for " moving out "; Carry out that needs add the correlative code to HANDOFF among the function ProcessRTSPRequest of handled being responsible for order according to RTSP; And in this document, add to handle the function of HANDOFF; It is used for obtaining RtspProxy relevant parameter that send and that in RtspRequest, parse (function of parameter is to stop broadcast for after being implemented in the x frame) in the RTSP order; And these parameters are passed to QTRTPFile, send response to RtspProxy simultaneously.SendStandardRTSPResponse () function in the Server.tproj/QTSSCallbacks.cpp file also need be done corresponding modification, the response part of migration instruction in the interpolation.Add function S endHandoffResponse () at class RTPSession and send the HANDOFF response.In Server.tproj/RTPStream.cpp and corresponding header file thereof, add the splicing work that new function AppendHandoff () accomplishes message.Message Transfer Part for " moving into "; Need when extracting parameter, need extract theSampleSeq, thePacketSeq, theTimeStampOffset and theSeqOffset to expanding in the DoSetup () function in the QTSS FileModule.cpp file; AddStream function in RTPSession can be created a unduplicated ssrc value at random in inside; Judge that in the AddRTPStream function flow process is the flow process of " moving into " or the flow process of common program request, if " moving into " flow process is then taken out corresponding SSRC; According to parameters such as theSampleSeq, thePacketSeq, the original position of playing after migration is accomplished is set at last.
(3) function implementation part: this part also has " moving out " and " moving into " two parts function to realize.For the function implementation part of " moving out ", need to increase the function that HandoffSample () is set, it is the sequence number that the frame that appointment of medium stream will stop to be set.In this function, at first take out RTPStream, be set to the value of migration frame among attribute and each track of RTPStream again and go; Then, in the GetNextPacket function, the frame number of the bag that relatively takes out and HandoffSampleNumber; If the former is less than the latter, then continues to give out a contract for a project, otherwise explain that this Media Stream will stop; Jump to next stream, continue to judge next stream more whether less than the HandoffSampleNumber of this stream, the words that are continue to give out a contract for a project; Otherwise return a value bigger, let it stop than the film time.Function implementation part for " moving into "; Need increase a Track who draws according to timestamp and serial number position offset newly; And need to increase by one the HANDOFF starting point function of (comprising original position frame number and packet numbers etc.) is set; Also will increase function so that when " moving into " flow process, obtain message data for the first time, later each message data is to obtain through PrefetchNextPacket () function.
The structural representation of the embodiment of a kind of streaming media server provided by the invention is as shown in Figure 7, comprises like lower module:
The services migrating message resolution module; Be used for the services migrating message that the balancing received load device sends; This services migrating message is resolved, obtain the positional information of the packet that carries in the said services migrating message, this positional information is passed to the service implementing module of moving out;
The service implementing of moving out module when being used for reaching in the position of the packet that sends to the user positional information that said services migrating message resolution module obtained, stops to the user Media Stream service being provided.
The structural representation of the embodiment of another kind of streaming media server provided by the invention is as shown in Figure 8, comprises like lower module:
Media Stream operation requests parsing module; Be used for the Media Stream operation requests that the balancing received load device sends; This Media Stream operation requests is resolved; Obtain positional information, Media Stream isochronous resources, time migration and the user profile of the packet that carries in the said Media Stream operation requests, and pass to the service implementing module of moving into;
The service implementing of moving into module; Be used for the information that passed over according to said Media Stream operation requests parsing module; Obtain corresponding medium stream information from said Media Stream isochronous resources; From the time of said time migration indication, send Media Stream to said user according to the positional information of packet.
In sum, use apparatus and method according to the invention after, can make Media Stream in service process, from current service node real-time migration to the service specified node.Can realize dynamic load balancing service, improve usage factor of system resource, realize the media resource in the group system is optimized deployment.
And in carrying out dynamic process of adjustment, can guarantee that Media Stream does not interrupt, client is not had any impact.Thereby the load balancing that reaches each node in the system that can be transparent makes each server node collaborative work.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. the method for a migrating medium stream online service is characterized in that, comprising:
Load equalizer is to providing the first-class media server of Media Stream service to send services migrating message to the user; Said first-class media server is according to the positional information of the packet of indicating in the said services migrating message; Stop to said user the Media Stream service being provided, the positional information of described packet comprises: sequence of data packet number in the corresponding sample sequence of Frame number and this sampling;
Said load equalizer is set up operation to the Media Stream that second streaming media server sends position, Media Stream isochronous resources, time migration and the user profile of carrying packet; Session processing module in said second streaming media server receives said Media Stream and sets up operation, and positional information, Media Stream isochronous resources and the time migration information of said packet is sent to the fluidization treatment module in said second streaming media server;
Said session processing module is returned the response that Media Stream is set up operation to said load equalizer; Said fluidization treatment module is obtained corresponding medium stream information from said Media Stream isochronous resources; From the time of said time migration indication, send Media Stream to said user according to the positional information of packet.
2. method according to claim 1 is characterized in that, the positional information of the packet of indicating in the positional information of the packet of indicating in the described services migrating message and the said Media Stream operation requests is identical.
3. method according to claim 1 is characterized in that, said first-class media server stops to the user Media Stream service being provided according to the positional information of the packet of indicating in the said services migrating message, specifically comprises:
Session processing module in the said first-class media server receives said services migrating message, and the positional information of the packet of indicating in the said services migrating message is sent to the fluidization treatment module in the said first-class media server;
When said fluidization treatment module reaches said positional information in the position of the packet that sends, stop to the user Media Stream service being provided, said session processing module is returned the services migrating response message to load equalizer.
4. method according to claim 1 is characterized in that, said method also comprises:
If the session processing module in the said first-class media server is checked out the positional information mistake of the invalid or said packet of said services migrating message, said session processing module is returned error message to load equalizer.
5. according to each described method of claim 1 to 4, it is characterized in that said method is applicable to the stream media server system of trunking mode.
6. a load equalizer is characterized in that, comprising:
Serve the module of moving out; Be used for to the service that provides the first-class media server of Media Stream service to send the positional information of the carrying packet message of moving out to the user; The positional information of described packet comprises: sequence of data packet number in the corresponding sample sequence of Frame number and this sampling; Said first-class media server stops to the user Media Stream service being provided according to the positional information of the packet that carries in the said services migrating message;
Serve the module of moving into; Be used for sending the Media Stream operation requests of position, Media Stream isochronous resources, time migration and the user profile of carrying packet to second streaming media server; So that said second streaming media server obtains corresponding medium stream information according to the said Media Stream isochronous resources that carries in the said Media Stream operation requests; From the time of said time migration indication, send Media Stream to said user according to the positional information of said packet.
7. a streaming media server is characterized in that, comprising:
The services migrating message resolution module; Be used for the services migrating message that the balancing received load device sends; This services migrating message is resolved; Obtain the positional information of the packet that carries in the said services migrating message, this positional information is passed to the service implementing module of moving out, the positional information of described packet comprises: sequence of data packet number in the corresponding sample sequence of Frame number and this sampling;
The service implementing of moving out module when being used for reaching in the position of the packet that sends to the user positional information that said services migrating message resolution module obtained, stops to the user Media Stream service being provided.
8. a streaming media server is characterized in that, comprising:
Media Stream operation requests parsing module; The Media Stream operation requests that is used for the position of carrying packet, Media Stream isochronous resources, time migration and the user profile of the transmission of balancing received load device; This Media Stream operation requests is resolved; Obtain positional information, Media Stream isochronous resources, time migration and the user profile of the packet that carries in the said Media Stream operation requests, and pass to the service implementing module of moving into;
The service implementing of moving into module; Be used for the information that passed over according to said Media Stream operation requests parsing module; Obtain corresponding medium stream information from said Media Stream isochronous resources; From the time of said time migration indication, send Media Stream to said user according to the positional information of packet.
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| CN110557381B (en) * | 2019-08-08 | 2021-09-03 | 武汉兴图新科电子股份有限公司 | Media high-availability system based on media stream hot migration mechanism |
| CN115474079A (en) * | 2022-08-11 | 2022-12-13 | 中国电信股份有限公司 | Media stream migration method and device, electronic equipment and storage medium |
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| WO2007068664A1 (en) * | 2005-12-12 | 2007-06-21 | International Business Machines Corporation | Load balancing and failover of distributed media resources in a media server |
| CN101068339A (en) * | 2007-06-01 | 2007-11-07 | 华为技术有限公司 | Method, server and user end for realizing video frequency requested program broadcasting-like services |
| CN101083605A (en) * | 2007-08-01 | 2007-12-05 | 华为技术有限公司 | Method, system and apparatus for quick switching media source |
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| WO2007068664A1 (en) * | 2005-12-12 | 2007-06-21 | International Business Machines Corporation | Load balancing and failover of distributed media resources in a media server |
| CN101068339A (en) * | 2007-06-01 | 2007-11-07 | 华为技术有限公司 | Method, server and user end for realizing video frequency requested program broadcasting-like services |
| CN101083605A (en) * | 2007-08-01 | 2007-12-05 | 华为技术有限公司 | Method, system and apparatus for quick switching media source |
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