CN104144359B - The method and system that IPTV multicast channels are switched fast - Google Patents
The method and system that IPTV multicast channels are switched fast Download PDFInfo
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- CN104144359B CN104144359B CN201310170184.1A CN201310170184A CN104144359B CN 104144359 B CN104144359 B CN 104144359B CN 201310170184 A CN201310170184 A CN 201310170184A CN 104144359 B CN104144359 B CN 104144359B
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Abstract
The present invention relates to the method and system that a kind of IPTV multicast channels are switched fast, method includes：The IGMP that access device sends set top box adds message and is transmitted to fast channel switching server；The fast channel switching server adds message according to the IGMP and serviced to set top box offer fast channel switching；When the fast channel switching server perceives the synchronization of new channel program stream, IGMP addition message is sent back into the access device；IGMP addition message is passed through upper layer device by the access device, to add the multicast group of new channel；When the access device receives the multicast media stream from upper layer device, the fast channel switching server is notified to stop fast channel switching service, and the multicast media stream is sent into the set top box.The present invention can reduce IPTV multicast channel handover delays, and without upgrading set top box.
Description
Technical field
The present invention relates to Web TV（Abbreviation IPTV）Field, more particularly to the side that a kind of IPTV multicast channels are switched fast
Method and system.
Background technology
IPTV multicast channel handover delays are IPTV service user experience quality indexs（Quality of Experience,
Abbreviation QoE）Important component.Channel change delay refer to since user manipulation remote control initiate channel switch request,
There is elapsed time on the tv screen in picture to requested channel.In general, the acceptable channel switch of people
Time delay should be within 1 second.Such as channel change delay had obvious delayed, pause sense more than 2 seconds, and user is easily sick of.
IPTV channel switch is different with traditional tv, in traditional cable TV network, and video terminal is received simultaneously
All channel signals, time of switching channels at 0.5 second or so, the time of switching channels of DTV because there is decoding process, compared with
Cable television is slightly long, but also within 1 second.IPTV is limited by the bandwidth of access network, and terminal can only receive channel all the way simultaneously, and
And, IPTV channel switch procedure needs complicated network signal interaction, therefore, and IPTV multicast channels handover delay is accumulative can be compared with
It is long.
There is a kind of fast channel that is referred to as to switch in the prior art（Fast Channel Change, abbreviation FCC）Technology,
Can be by channel switch, from FCC servers to set top box（Set Top Box, abbreviation STB）Send out special soon using I frames as
The unicast program stream of starting reduces switching time.It is the frame friendship with I, B, P three types that its principle, which is primarily due to Media Stream,
For being spaced what is formed, shape such as IBBPBBPIBBPBBP, set top box only receives B, P frame and can not individually decoded, it is necessary to waits and receives
During first I frame, it could start to decode and play frame out.After FCC technologies, set top box receives special unicast stream, the
One frame is exactly I frames, it may not be necessary to waited, rapid decoding.
The technology also requires that set top box all in network is done accordingly while FCC servers are increased in requiring network
Transformation.But, the brand of set top box is numerous in existing network, it is desirable to which the set top box of all brands is transformed, and is serviced one by one with FCC
Device integration test, workload is not small.
The content of the invention
The purpose of the present invention is to propose to the method and system that a kind of IPTV multicast channels are switched fast, IPTV groups can be reduced
Channel change delay is broadcast, and without upgrading set top box.
To achieve the above object, the invention provides a kind of method that IPTV multicast channels are switched fast, including：
The IGMP that access device sends set top box（Internet Group Management
Protocol, abbreviation IGMP）Add message and be transmitted to fast channel switching server；
The fast channel switching server adds message according to the IGMP and carried to the set top box
Switch for fast channel and service；
When the fast channel switching server perceives the synchronization of new channel program stream, by the IGMP
Add message and send back to the access device；
IGMP addition message is passed through upper layer device by the access device, to add new channel
Multicast group；
When the access device receives the multicast media stream from upper layer device, the fast channel switching server is notified
Stop fast channel switching service, and the multicast media stream is sent to the set top box.
Further, the IGMP sent set top box in the access device adds message and is transmitted to soon
Before fast channel switching server, in addition to：
When the set top box receives channel switch request, to the access device send IGMP from
Open message；
The IGMP leave group message is passed through upper layer device by the access device, to depart from original channel
Multicast group.
Further, the fast channel switching server adds message to described according to the IGMP
Set top box provides the fast channel operation that switching is serviced：
The fast channel switching server adds the new frequency of message selection caching according to the IGMP
The video information in road；
New channel section of the fast channel switching server by I frames in the video information of the new channel cached to originate
Mesh stream is pushed to the set top box with mode of unicast speed.
Further, I frames in the video information of the new channel cached are starting by the fast channel switching server
The operation that the set top box is pushed to mode of unicast speed of new channel program stream be specially：
I frames newest in the video information of the new channel cached are the new of starting by the fast channel switching server
Channel program stream is pushed to the set top box with mode of unicast 1.N speeds.
Further, the fast channel switching server perceives the synchronous operation of new channel program stream and is specially：
The fast channel switching server is checked from the real-time of the multicast media stream of the new channel received by multicast source
Host-host protocol sequence number whether the new channel program stream with being sent to the set top box RTP sequence number it is identical, if phase
Together, it is determined that perceive new channel program stream synchronous.
Further, when the access device receives the multicast media stream from upper layer device, the fast channel is notified
Switching server stopping fast channel switching the operation serviced and is specially：
When the access device receives the multicast media stream from upper layer device, sent out to the fast channel switching server
Go out to stop the notice of fast channel switching service；
The fast channel switching server notifies to stop to send new channel program stream to the set top box according to described.
Further, the access device passes through the IGMP leave group message behaviour of upper layer device
Work is specially：
The IGMP leave group message is passed through multicast router by the access device；
The IGMP is added message and passes through the operation of upper layer device by the access device is specially：
IGMP addition message is passed through multicast router by the access device；
The operation that the access device receives the multicast media stream from upper layer device is specially：
The access device receives the multicast media stream from multicast source.
To achieve the above object, the system being switched fast the invention provides a kind of IPTV multicast channels includes：
Access device, the IGMP for set top box to be sent adds message and is transmitted to fast channel switching
Server, will when receiving the IGMP addition message that the fast channel switching server is beamed back
The IGMP adds message and passes through upper layer device, to add the multicast group of new channel, and comes when receiving
From the multicast media stream of upper layer device when, notify the fast channel switching server to stop fast channel switching service, and will
The multicast media stream is sent to the set top box；
Fast channel switching server, the IGMP for being forwarded according to the access device is added
Message provides fast channel switching to the set top box and serviced, when perceiving the synchronization of new channel program stream, by the internet
Igmpinternet adds message and sends back to the access device.
Further, the access device is specifically included：
First message forwarding module, the IGMP for the set top box to be sent adds message and is transmitted to
The fast channel switching server；
First message transparent transmission module, for receiving the Internet group that the fast channel switching server is beamed back
When management agreement adds message, IGMP addition message is passed through into upper layer device, to add new channel
Multicast group；
Stop Service Notification module, for receiving during the multicast media stream from upper layer device, notify the fast channel
Switching server stops fast channel switching service；
Multicast data flow sending module, for the multicast media stream to be sent into the set top box.
Further, the access device also includes：
Second message transparent transmission module, for receiving the IGMP leave group message that the set top box is sent
When, the IGMP leave group message is passed through into upper layer device, to depart from the multicast group of original channel.
Further, the fast channel switching server is specifically included：
Service providing module, the IGMP for being forwarded according to the access device add message to
The set top box provides fast channel switching service；
Synchronous sensing module, it is synchronous for perceiving new channel program stream；
Message beams back module, for when perceiving the synchronization of new channel program stream, the IGMP to be added
Enter message and send back to the access device.
Further, the service providing module is specifically included：
Channel caches selecting unit, the new channel for adding message selection caching according to the IGMP
Video information；
Unicast push unit, for the new channel program stream for originating I frames in the video information of the new channel cached
The set top box is pushed to mode of unicast speed.
Further, the unicast push unit is specifically for by I newest in the video information of the new channel cached
Frame is pushed to the set top box for the new channel program stream of starting with mode of unicast 1.N speeds.
Further, the synchronous sensing module is specifically included：
Sequence number inspection unit, the RTP sequence for the multicast media stream from the new channel received by multicast source
Number whether the new channel program stream with being sent to the set top box RTP sequence number it is identical；
Confirmation of synchronization unit is perceived, for when RTP sequence number is identical, it is determined that perceiving new channel program stream
It is synchronous.
Based on above-mentioned technical proposal, access device of the present invention is triggered by adding the interception and forwarding of message to IGMP
FCC servers provide fast channel switching service, and receive the IGMP that FCC servers are returned in the perception synchronization of FCC servers
Message is added, and passes through upper layer device, to obtain the multicast media stream of new channel, in whole process, access device and FCC
Server is all transparent for set top box to the IGMP processing procedures for adding message, therefore without being risen to set top box
Level, while can also realize the purpose of reduction IPTV multicast channel handover delays.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic flow sheet of an embodiment of the method that IPTV multicast channels of the present invention are switched fast.
Fig. 2 is the signaling process schematic diagram of another embodiment for the method that IPTV multicast channels of the present invention are switched fast.
Fig. 3 is the structural representation of an embodiment of the system that IPTV multicast channels of the present invention are switched fast.
Fig. 4 is the structural representation of another embodiment for the system that IPTV multicast channels of the present invention are switched fast.
Embodiment
Below by drawings and examples, technical scheme is described in further detail.
As shown in figure 1, the schematic flow sheet of an embodiment of the method being switched fast for IPTV multicast channels of the present invention.
In the present embodiment, IPTV multicast channels, which are switched fast flow, to be included：
The IGMP that step 101, access device send set top box adds message（IGMP Join）It is transmitted to FCC servers；
Step 102, FCC servers provide channel to set top box according to IGMP Join message and are switched fast service；
When step 103, FCC servers perceive the synchronization of new channel program stream, IGMP Join message is sent back into access and set
It is standby；
IGMP Join message is passed through upper layer device by step 104, access device, to add the multicast group of new channel；
When step 105, access device receive the multicast media stream from upper layer device, FCC servers are notified to stop channel
Service is switched fast, and multicast media stream is sent to set top box.
In existing channel switch flow, cut before and after the channel number keyboard or channel in user's remote controller
Change button, or user, when directly operating the channel switch button on set top box, this operation can be converted into IGMP by set top box
Join message is sent to access device, to pass to upper layer device by access device, to obtain the multicast media of corresponding channel
Stream.But the problem of this mode can cause channel change delay due to complicated network signal interaction, existing settling mode
It is requirement set top box when initiating channel switch, first whereabouts FCC servers send request, to obtain what is cached on FCC servers
Channel content, then stops the service of FCC servers after the multicast group of new channel is added to, but this mode requires machine top
Box is transformed, and can first be sent and be asked to FCC servers, and this means to large number of all kinds brand
Set top box will make this upgrading, and difficulty is very big.
The service of FCC servers is initiated to change to be realized by access device by the present embodiment, i.e., when access device receives IGMP
During Join message, no longer direct this message of transparent transmission, but forward that message to FCC servers, by FCC servers are come for machine
Top box provides the program stream of the new channel in channel switch procedure, user is not had delay sense when watching.Due to FCC servers
It is the new channel program stream of caching, therefore is supplied to the new channel program stream of set top box generally will be earlier than current new channel program
Stream, therefore be accomplished by after synchronously completing, reinform the multicast group that upper layer device adds set top box new channel.This was notified
Journey is participated in without set top box, only needs FCC servers when perceiving synchronous, IGMP Join message is sent back into access device, then
Upper layer device is passed through by access device.It can be seen that, the problem of the present embodiment can not only solve channel change delay,
And only need to transform FCC servers and access device, transformation amount is much smaller compared to upgrading set top box.
Set top box generally will first depart from the multicast group of original channel, be then added to new frequency when receiving channel switch request
The multicast group in road, therefore also IGMP Leave message can be sent to access device before IGMP Join message is sent, and access
The IGMP Leave message directly can be passed through upper layer device by equipment, to depart from the multicast group of original channel.This process can
With consistent with existing procedure.
FCC servers are when receiving IGMP Join message, it will provide fast channel switching to set top box and service, this
FCC servers can select the video information of the new channel of caching according to IGMP Join message during individual, and will cache
I frames are pushed to set top box for the new channel program stream of starting with mode of unicast speed in the video information of new channel.Due to machine top
Box will could start decoding and broadcasting pictures when receiving I frames, therefore FCC servers are by the video information of the new channel of caching
In I frames as the program stream of start frame be sent to set top box, set top box can be made to be decoded and be played at once.And due to
The RTP of I frames（Real-time Transport Protocol, abbreviation RTP）Sequence number is generally real-time earlier than multicast source
The RTP sequence numbers of push, therefore can be pushed with mode of unicast 1.N speeds, unicast speed here is generally in 1 speed and 2
Between speed, the degree shifted to an earlier date according to the RTP sequence numbers of I frames, it is also an option that higher speed, is greater than being equal to 2 speeds etc..It is excellent
Select using I frames newest in the video information of the new channel in having cached as start frame program stream with mode of unicast 1.N speeds
Set top box is pushed to, the synchronization of program stream can be not only realized as early as possible, and user need not be influenceed using too high speed
Viewing.
With the broadcasting of the program stream of FCC server push, FCC servers need the synchronization to new channel program stream to carry out
Perceive, this perception can be checked by FCC servers from the real-time of the multicast media stream of the new channel received by multicast source
Host-host protocol sequence number whether new channel program stream with being sent to set top box RTP sequence number it is identical realize, if
Sequence number is identical, it is determined that perceive new channel program stream synchronous.
IGMP Join message is sent back to access device by FCC servers when perceiving the synchronization of new channel program stream, and is connect
Enter equipment and IGMP Join message is passed through into upper layer device, to add the multicast group of new channel, upper layer device can be according to IGMP
The multicast media stream of corresponding channel is sent to access device by Join message, when access device receives the group from upper layer device
When broadcasting Media Stream, the notice for stopping fast channel switching service, fast channel switching server then basis are sent to FCC servers
The notice stops sending new channel program stream to set top box.
As shown in Fig. 2 the signaling process of another embodiment for the method being switched fast for IPTV multicast channels of the present invention shows
It is intended to.In the present embodiment, access device is that carrier side accesses the equipment of user access network such as digital subscriber line again
Use device（Digital Subscriber Line Access Multiplexer, abbreviation DSLAM）.Upper layer device can include group
Broadcast router and multicast source.IPTV multicast channel fast switch over method includes：
Step 201, as the channel number keyboard in user's remote controller either front and rear switching key of channel or user
When directly operating the channel switch button on set top box, IGMP Leave message is sent to access device by set top box；
IGMP Leave message is passed through multicast router by step 202, access device；
IGMP Join message is sent to access device by step 203, set top box；
The IGMP Join message received is transmitted to FCC servers by step 204, access device；
Step 205, FCC servers select the video information of the new channel of caching according to IGMP Join message, and will delay
Newest I frames are pushed to machine for the new channel program stream of starting with mode of unicast 1.N speeds in the video information for the new channel deposited
Top box；
Step 206, the inspection of FCC servers are from the RTP sequence numbers of the multicast media stream of the new channel received by multicast source
The no RTP sequence numbers with being sent to the new channel program stream of set top box are identical, if identical, it is determined that perceive new channel program stream
It is synchronous, and IGMP Join message is sent back into access device；
IGMP Join message is passed through multicast router by step 207, access device, to add the multicast group of new channel；
Multicast media stream is sent to access and set by step 208, multicast source after access device adds the multicast group of new channel
It is standby；
When step 209, access device receive the multicast media stream from multicast source, FCC servers are notified to stop Rapid Frequency
Road switching service；
Multicast media stream is sent to set top box by step 210, access device.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of including above method embodiment is performed；And foregoing storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
As shown in figure 3, the structural representation of an embodiment of the system being switched fast for IPTV multicast channels of the present invention.
In the present embodiment, the system that IPTV multicast channels are switched fast includes：Access device 1 and FCC servers 2.
The IGMP Join message that access device 1 is responsible for sending set top box is transmitted to FCC servers 2, is receiving FCC
During the IGMP Join message that server 2 is beamed back, IGMP Join message is passed through into upper layer device, to add the multicast of new channel
Group.When access device 1 receives the multicast media stream from upper layer device, FCC servers 2 are notified to stop fast channel switching clothes
Business, and multicast media stream is sent to set top box.
The IGMP Join message that FCC servers 2 are responsible for being forwarded according to access device provides fast channel switching to set top box
Service, when perceiving the synchronization of new channel program stream, access device 1 is sent back to by IGMP Join message.
In the present embodiment, access device can trigger FCC services by adding the interception and forwarding of message to IGMP
Device offer fast channel switching is serviced, and the IGMP additions that reception FCC servers are returned when FCC servers perceive synchronous disappear
Breath, and upper layer device is passed through, to obtain the multicast media stream of new channel, in whole process, access device and FCC servers
The processing procedure that message is added to IGMP is all transparent for set top box, therefore without upgrading to set top box, simultaneously
Also the purpose of reduction IPTV multicast channel handover delays can be realized.
As shown in figure 4, the structural representation of another embodiment for the system being switched fast for IPTV multicast channels of the present invention.
In the present embodiment, access device 1 is specifically included：First message forwarding module 11, first message transparent transmission module 12, stopping service
Notification module 13 and multicast data flow sending module 14.
The IGMP Join message that first message forwarding module 11 is used to send set top box is transmitted to FCC servers.First
Message transparent transmission module 12 is responsible for when receiving the IGMP Join message that FCC servers are beamed back, by IGMP Join message transparent transmissions
To upper layer device, to add the multicast group of new channel.Stop Service Notification module 13 to be responsible for receiving the multicast from upper layer device
During Media Stream, FCC servers are notified to stop fast channel switching service.Multicast data flow sending module 14 is responsible for sending out multicast media stream
Give set top box.
In another embodiment, access device can also include the second message transparent transmission module, for receive it is described
During the IGMP Leave message that set top box is sent, IGMP Leave message is passed through into upper layer device, to depart from the group of original channel
Broadcast group.
In the present embodiment, FCC servers 2 are specifically included：Service providing module 21, synchronous sensing module 22 and message hair
Return module 23.
Service providing module 21 is responsible for the IGMP Join message forwarded according to the access device to the set top box
Fast channel switching service is provided.Synchronous sensing module 22 is responsible for perceiving the synchronization of new channel program stream.It is negative that message beams back module 23
The IGMP Join message is sent back to the access device by duty when perceiving the synchronization of new channel program stream.
For service providing module, it can specifically include channel caching selecting unit and unicast push unit, its
Mid band caching selecting unit is used for the video information that the new channel of caching is selected according to IGMP Join message, and unicast pushes single
The new channel program stream that member is used for by I frames in the video information of the new channel cached for starting is pushed to mode of unicast speed
Set top box.Unicast push unit is preferably by new channel section of the I frames newest in the video information of the new channel cached for starting
Mesh stream is pushed to set top box with mode of unicast 1.N speeds.
Synchronous sensing module can specifically include sequence number inspection unit and perceive confirmation of synchronization unit, wherein sequence number checklist
Whether member is used for from the RTP sequence numbers of the multicast media stream of the new channel received by multicast source with being sent to the new channel of set top box
The RTP sequence numbers of program stream are identical, and perceiving confirmation of synchronization unit is used for when RTP sequence number is identical, it is determined that perceiving new
Channel program stream is synchronous.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among claimed technical scheme scope of the invention.
Claims (14)
1. a kind of method that IPTV multicast channels are switched fast, including：
The IGMP that access device sends set top box adds message and is transmitted to fast channel switching server；
The fast channel switching server adds message according to the IGMP and provided soon to the set top box
Fast channel switching service；
When the fast channel switching server perceives the synchronization of new channel program stream, the IGMP is added
Message sends back to the access device；
IGMP addition message is passed through upper layer device by the access device, to add the group of new channel
Broadcast group；
When the access device receives the multicast media stream from upper layer device, the fast channel switching server is notified to stop
Fast channel switching service, and the multicast media stream is sent to the set top box.
2. the method that IPTV multicast channels according to claim 1 are switched fast, wherein, in the access device by machine top
The IGMP that box is sent adds message and is transmitted to before fast channel switching server, in addition to：
When the set top box receives channel switch request, leave and disappear to access device transmission IGMP
Breath；
The IGMP leave group message is passed through upper layer device by the access device, to depart from the group of original channel
Broadcast group.
3. the method that IPTV multicast channels according to claim 2 are switched fast, wherein, the fast channel switching service
It is specific to the operation of set top box offer fast channel switching service that device adds message according to the IGMP
For：
The fast channel switching server adds the new channel of message selection caching according to the IGMP
Video information；
New channel program stream of the fast channel switching server by I frames in the video information of the new channel cached to originate
The set top box is pushed to mode of unicast speed.
4. the method that IPTV multicast channels according to claim 3 are switched fast, wherein, the fast channel switching service
I frames in the video information of the new channel cached are pushed to described by device for the new channel program stream of starting with mode of unicast speed
The operation of set top box is specially：
New channel of the fast channel switching server by I frames newest in the video information of the new channel cached to originate
Program stream is pushed to the set top box with mode of unicast 1.N speeds.
5. the method that the IPTV multicast channels according to claim 3 or 4 are switched fast, wherein, the fast channel switching
Server perceives the synchronous operation of new channel program stream：
The fast channel switching server checks the real-time Transmission from the multicast media stream of the new channel received by multicast source
Agreement sequence number whether the new channel program stream with being sent to the set top box RTP sequence number it is identical, if identical,
Then determine to perceive the synchronization of new channel program stream.
6. the method that the IPTV multicast channels according to claim 3 or 4 are switched fast, wherein, the access device is received
During multicast media stream from upper layer device, the fast channel switching server is notified to stop the behaviour of fast channel switching service
Work is specially：
When the access device receives the multicast media stream from upper layer device, send and stop to the fast channel switching server
The notice that only fast channel switching is serviced；
The fast channel switching server notifies to stop to send new channel program stream to the set top box according to described.
7. the method that IPTV multicast channels according to claim 2 are switched fast, wherein, the access device will be described mutual
Networking igmpinternet leave group message passes through the operation of upper layer device and is specially：
The IGMP leave group message is passed through multicast router by the access device；
The IGMP is added message and passes through the operation of upper layer device by the access device is specially：
IGMP addition message is passed through multicast router by the access device；
The operation that the access device receives the multicast media stream from upper layer device is specially：
The access device receives the multicast media stream from multicast source.
8. the system that a kind of IPTV multicast channels are switched fast, including：
Access device, the IGMP for set top box to be sent adds message and is transmitted to fast channel switching service
Device, will be described when receiving the IGMP addition message that the fast channel switching server is beamed back
IGMP adds message and passes through upper layer device, to add the multicast group of new channel, and when reception is from upper
During the multicast media stream of layer equipment, the fast channel switching server is notified to stop fast channel switching service, and will be described
Multicast media stream is sent to the set top box；
Fast channel switching server, the IGMP for being forwarded according to the access device adds message
Fast channel switching service is provided to the set top box, when perceiving the synchronization of new channel program stream, by the Internet group pipe
Reason agreement adds message and sends back to the access device.
9. the system that IPTV multicast channels according to claim 8 are switched fast, wherein, the access device is specifically wrapped
Include：
First message forwarding module, the IGMP addition message for the set top box to be sent is transmitted to described
Fast channel switching server；
First message transparent transmission module, for receiving the internet group management that the fast channel switching server is beamed back
When agreement adds message, IGMP addition message is passed through into upper layer device, to add the group of new channel
Broadcast group；
Stop Service Notification module, for receiving during the multicast media stream from upper layer device, notify the fast channel to switch
Server stops fast channel switching service；
Multicast data flow sending module, for the multicast media stream to be sent into the set top box.
10. the system that IPTV multicast channels according to claim 9 are switched fast, wherein, the access device also includes：
Second message transparent transmission module, for when receiving the IGMP leave group message that the set top box is sent,
The IGMP leave group message is passed through into upper layer device, to depart from the multicast group of original channel.
11. the system that IPTV multicast channels according to claim 10 are switched fast, wherein, the fast channel switching clothes
Business implement body includes：
Service providing module, the IGMP for being forwarded according to the access device adds message to described
Set top box provides fast channel switching service；
Synchronous sensing module, it is synchronous for perceiving new channel program stream；
Message beams back module, for when perceiving the synchronization of new channel program stream, the IGMP being added and disappeared
Breath sends back to the access device.
12. the system that IPTV multicast channels according to claim 10 are switched fast, wherein, the service providing module tool
Body includes：
Channel caches selecting unit, for adding regarding for the new channel that message selection is cached according to the IGMP
Frequency information；
Unicast push unit, for by I frames in the video information of the new channel cached for starting new channel program stream with list
Broadcast mode speed is pushed to the set top box.
13. the system that IPTV multicast channels according to claim 12 are switched fast, wherein, the unicast push unit tool
Body be used for by I frames newest in the video information of the new channel cached for starting new channel program stream with mode of unicast 1.N
Speed is pushed to the set top box.
14. the system that the IPTV multicast channels according to claim 12 or 13 are switched fast, wherein, the synchronous perception mould
Block is specifically included：
Sequence number inspection unit, the RTP sequence number for the multicast media stream from the new channel received by multicast source is
The no RTP sequence number with being sent to the new channel program stream of the set top box is identical；
Confirmation of synchronization unit is perceived, for when RTP sequence number is identical, it is determined that it is synchronous to perceive new channel program stream.
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| CN201310170184.1A CN104144359B (en) | 2013-05-10 | 2013-05-10 | The method and system that IPTV multicast channels are switched fast |
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| CN201310170184.1A CN104144359B (en) | 2013-05-10 | 2013-05-10 | The method and system that IPTV multicast channels are switched fast |
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| CN103347207B (en) * | 2013-06-28 | 2017-10-17 | 江苏省邮电规划设计院有限责任公司 | A kind of method that IPTV multicast channels are switched fast |
| CN104811790A (en) * | 2015-05-14 | 2015-07-29 | 国网黑龙江省电力有限公司信息通信公司 | Method for quickening channel change speed of digital TV (television) set-top box by combining unicast with multicast |
| CN105376613B (en) | 2015-12-10 | 2019-05-10 | 华为技术有限公司 | A kind of fast channel switching method, server and IPTV system |
| CN106937155B (en) * | 2015-12-29 | 2020-06-02 | 北京华为数字技术有限公司 | Access device, Internet Protocol Television (IPTV) system and channel switching method |
| CN107566855B (en) * | 2016-06-30 | 2020-11-10 | 华为技术有限公司 | Method for quickly switching channels, server and set top box |
| CN106961623A (en) * | 2017-04-11 | 2017-07-18 | 深圳市茁壮网络股份有限公司 | A kind of digital television system, headend equipment and set top box |
| CN107682718A (en) * | 2017-09-21 | 2018-02-09 | 烽火通信科技股份有限公司 | The method and system of fast switching channels under more IPTV platforms |
| CN114449357A (en) * | 2020-11-02 | 2022-05-06 | 青岛海信宽带多媒体技术有限公司 | Method, device and terminal for optimizing IPTV multicast channel switching |
| CN114363715A (en) * | 2021-12-22 | 2022-04-15 | 中国电信股份有限公司 | Video playing method and related equipment |
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| KR20000036891A (en) * | 2000-03-31 | 2000-07-05 | 김지혜 | Method and system for filtering multicast data stream and converting to unicast data stream |
| CN102422649A (en) * | 2009-05-13 | 2012-04-18 | 阿尔卡特朗讯公司 | Fast channel change handling of late multicast join |
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| KR20000036891A (en) * | 2000-03-31 | 2000-07-05 | 김지혜 | Method and system for filtering multicast data stream and converting to unicast data stream |
| CN102422649A (en) * | 2009-05-13 | 2012-04-18 | 阿尔卡特朗讯公司 | Fast channel change handling of late multicast join |
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