CN100518311C - Method for reducing response time of direct broadcast band switchover - Google Patents
Method for reducing response time of direct broadcast band switchover Download PDFInfo
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- CN100518311C CN100518311C CNB200610011566XA CN200610011566A CN100518311C CN 100518311 C CN100518311 C CN 100518311C CN B200610011566X A CNB200610011566X A CN B200610011566XA CN 200610011566 A CN200610011566 A CN 200610011566A CN 100518311 C CN100518311 C CN 100518311C
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- media server
- top box
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Abstract
This invention relates to a method for reducing switch response time of living broadcast channels used in a network TV network composed of a living broadcast head, a stream media server, a set-top box server and a real-time stream protocol control channel set between the media server and the set-top box, and the method includes the following steps: said media server receives living broadcast flow sent by the head to store the video data scheduled by each channel in the local memory, when the channel is switched, it sends the session description protocol file of the living broadcast channel to said box via the control channel, selecting a key video frame of the switch channel buffer-stored in the media server and transmitting said frame and the video data stored in the server to the video buffer region in the set-top box.
Description
Technical field
The present invention relates to the Web TV field, particularly relate to a kind of direct broadcast band handoff response time method that when live, reduces.
Background technology
Network TV business (being the IPTV business) develops very fast at home and abroad, has become fixed network operators gradually and has improved one of trump card business of its every user's average income (ARPU-Average Revenue Per User).By the IPTV platform, domestic consumer can carry out video request program, watches the real-time television program, and carries out video telephone etc.Very important business wherein, i.e. live broadcast service, and present this business is on the internet network carries out channel when switching, and the response time that the user experiences is at least 3 seconds even longer time.
Being constructed as follows of response time when direct broadcast band switches:
1, set-top box (hereinafter to be referred as STB, set top box) cut-off is broadcast channel SDP (SDP, SessionDescription Protocol, Session Description Protocol) time, 0.5 second;
2, RTSP (RSTP, real time streaming protocol, real-time streaming protocol) connection setup time between STB and the media server, 0.5 second;
3, obtain key frame of video I frame time, in key frame of video (I frame) 2 seconds at interval, average 1 second;
4, the STB buffer memory video Buffer time, 2 seconds;
To above channel handoff response time composition analysis, not handle if do not carry out specific process, the user experience direct broadcast band will reach about 4 seconds switching time.
Wherein, key frame of video (I frame) is the frame that can put down in writing view data fully, is also referred to as full frame, also comprises P frame and B frame thereafter.The P frame is a forward predicted frame, be according to the comparison of former frame image, remove identical data and the frame that constitutes.The B frame is a bi-directional predicted frames, is according to the frame that obtains with front and back picture frame comparison.P, B frame need rely on the relevant information of I frame to play a role.I frame, P frame, B frame are formed fixing and a circulate structure.Therefore, only obtain key frame of video I frame and could guarantee the coherent smooth and easy of broadcast.
Simultaneously,, there are two kinds at present, a kind ofly between streaming media server and set-top box, set up control channel, directly, the live data message is sent to set-top box by mode of unicast for live implementation; Another mode streaming media server or multicast gateway, with the live data message with multicast mode transmitter top box.The live handoff response time method of minimizing under mode of unicast just of the follow-up record of this paper.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of minimizing direct broadcast band handoff response time method, reduces the response time that channel switches when live as much as possible.
For achieving the above object, the invention provides a kind of minimizing direct broadcast band handoff response time method, be used for the Web TV net formed by live head end, streaming media server, set-top box, establish real-time streaming protocol control channel between media server and the set-top box, this method may further comprise the steps:
Described media server receives the live TV stream that described live head end sends, to each channel all the buffer memory predetermined video data in local internal memory;
When channel taking place switch, described media server sends to described set-top box by described control channel with the Session Description Protocol file of direct broadcast band; Media server transmits control message to set-top box, the announcement machine top box its with the FastData frame;
A key video sequence frame of this switching channels of buffer memory in the selected media server, send this key video sequence frame and subsequent in media server the video data of buffer memory to the screen buffer of set-top box.
Describedly be sent as quick transmission form.
Described method also comprises: if current live position is less than or equal to 3/4 key video sequence frame pitch apart from the nearest key video sequence frame of buffer memory in the media server, then send key video sequence frame in front of nearest key video sequence frame; If current live position is apart from the nearest key video sequence frame of buffer memory in the media server, the key video sequence frame pitch greater than 3/4 then sends nearest key video sequence frame.
Described method also comprises: media server transmits control message to set-top box, and it will send the step of data with normal mode the announcement machine top box.
The time span of described predetermined video data is greater than 2.5 key video sequence frame pitch.
Adopt method provided herein, the channel handoff response time can be improved to about 2 seconds, the user experience effect will strengthen greatly like this.
Description of drawings
Fig. 1 is the live broadcast service networking diagram that arrives involved in the present invention;
Fig. 2 is that the present invention realizes live switching flow figure fast;
Fig. 3 A is that selection of the present invention transmits original position algorithm schematic diagram fast;
Fig. 3 B is that selection of the present invention transmits original position algorithm schematic diagram fast.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
Figure 1 shows that the live broadcast service networking diagram that arrives involved in the present invention.This network is by live head end, central area media server, and the streaming media server of fringe node and the set-top box STB in the family form.Wherein, live head end is used to provide TV programme live source signal.The central area media server of this live head end and various places links, and each central area media server continues again to be connected with the streaming media server of edge zone.Like this, the user who is positioned at everywhere just can receive the programme televised live that live head end is play by the relaying of above-mentioned what server.
Routine as shown in FIG., live head end 100 provides the live source signal, and central area media server MS0 arrives fringe region 1 and fringe region 2 with the live signal direct repeating system.And the node 1 ' of this fringe region 1 is by media server MS1, MS2, and MS3 forms, and MS1 is connected with set-top box STB1, STB2, STB3 again.Use STB1 to watch that programme televised live is example with a user below, illustrate this network system is how to realize reducing time that channel switches.
See also Fig. 2, Figure 2 shows that the present invention realizes the flow chart of live switching fast.Each direct broadcast band of system start-up (step S200) and streaming media server MS0, MS1, and control is with the program video data of direct broadcast band A, B, C, media server MS0 by Centroid is relayed to MS1, the data flow of media server MS1 receiving channels A, B, C, simultaneously in order to save time when the switching channels, live TV stream data to each channel, all the predetermined data (following this tentation data of all establishing is at least 2.5 key video sequence frame periods, establishes this key video sequence interframe and is divided into 2 seconds) of buffer memory are in local internal memory (step S201).
At this moment, suppose the user, then set up real time streaming protocol (rtsp) control channel between STB1 and the MS1 just at viewing channel A.User's switching channels enters channel B (step S202) subsequently.Then MS1 utilizes above-mentioned RTSP control channel that Session Description Protocol (SDP) file of channel B is sent to STB1 (step S203) at once, has carried out the parameter of converted channel and has prepared.Subsequently, MS1 sends set parameter message to STB1, is about to the message that attribute x-SpeedupPlay is made as YES and sends to STB1 (step S204), and with notice STB1, MS1 is about to the FastData frame and gives it.And this MS1 the data that will send fast be buffered in data in the MS1 internal memory just.Just because of among the MS1 at any time all buffer memory the program data of each channel, needn't as prior art, need to wait for the key frame of video (I frame) of obtaining new channel again when making switching channels, just can carry out the buffering and the demonstration of data.
Subsequently, media server MS1 will send the net cast stream (I frame and subsequent 2 seconds video datas) of channel B buffer memory fast to STB1 (step S205), the algorithm of the I frame that wherein concrete definite desire sends comprises: just the data of 2.5 I frame periods after live current location all are buffered among the MS1, if then live current location and nearest next I frame, when just being less than or equal to the I frame pitch (1.5 seconds) of 3/4 ratio with the interval that has the nearest I frame among the MS1, then the I frame in front from nearest I frame begins to transmit fast to STB1; When the interval of live current location and nearest I frame during, then begin to transmit from nearest I frame greater than the I frame pitch (1.5 seconds) of 3/4 ratio.The data volume that transmits is 2 seconds video datas.
Below by Fig. 3 A and Fig. 3 B this regioselective process of statement of image more.As shown in the figure, when being positioned at live position a and switching, because a position and nearest I frame (I
1) distance less than 3/4 I frame pitch, the then I of buffer memory from MS1
2Locate, transmit I fast
2And 2 seconds thereafter video data is to the screen buffer of set-top box STB1.When being positioned at live position b and switching, because b position and nearest I frame (I
1) distance greater than 3/4 I frame pitch, the then I of buffer memory from MS1
1Locate, transmit I fast
1And 2 seconds thereafter video data is to the screen buffer (step S206) of set-top box STB1.
Subsequently, MS1 sends set parameter message to STB1 once more, is about to the message that attribute x-SpeedupPlay is made as NO and sends to STB1, will send the screen buffer (step S207) of Frame to STB1 with normal speed with notice STB1 MS1.After the screen buffer of STB1 was filled, with the channel of playing automatically after switching (step S208), the user just can begin to have watched the content of channel B.
The method that the present invention recorded and narrated, by at any time the partial programme data that are about to play of each channel being carried out the method for buffer memory, save wait when making channel switch and obtained time of the key frame of video I frame of new channel, in the mode of quick transmission the programme televised live data of new channel are sent to the screen buffer of set-top box simultaneously, also saved greatly the time that is full of screen buffer, accelerated the speed of switching.
The response time that channel of the present invention switches is mainly by exchange parameter institute's time-consuming between set-top box and the media server and fill up buffering area institute time-consuming and constitute, so the response time that channel switches can be improved to about 2 seconds.Need follow-up 1 second of buffering just can carry out video playback with interior data if the screen buffer of STB1 only can further be improved to, then channel handoff response time of arriving of user experience will be near 1 second.
Claims (6)
1, a kind of minimizing direct broadcast band handoff response time method, be used for the Web TV net formed by live head end, streaming media server, set-top box, establish real-time streaming protocol control channel between media server and the set-top box, it is characterized in that, this method may further comprise the steps:
(11) described media server receives the live TV stream that described live head end sends, to each channel all the buffer memory predetermined video data in local internal memory;
(12) when channel taking place switch, described media server sends to described set-top box by described control channel with the Session Description Protocol file of direct broadcast band; Media server transmits control message to set-top box, the announcement machine top box its with the FastData frame;
(13) a key video sequence frame of this switching channels of buffer memory in the selected media server, send this key video sequence frame and subsequent in media server the video data of buffer memory to the screen buffer of set-top box.
2, the method for claim 1 is characterized in that, is sent as quick transmission form in step (13).
3, method as claimed in claim 1 or 2 is characterized in that, the step that should select the key video sequence frame in step (13) comprises:
If current live position is less than or equal to 3/4 key video sequence frame pitch apart from the nearest key video sequence frame of buffer memory in the media server, then send key video sequence frame in front of nearest key video sequence frame;
If current live position is apart from the nearest key video sequence frame of buffer memory in the media server, the key video sequence frame pitch greater than 3/4 then sends nearest key video sequence frame.
4, method as claimed in claim 1 or 2 is characterized in that, also comprise afterwards in step (13): media server transmits control message to set-top box, and it will send the step of data with normal mode the announcement machine top box.
5, method as claimed in claim 4 is characterized in that, also comprise afterwards in step (13): media server transmits control message to set-top box, and it will send the step of data with normal mode the announcement machine top box.
6, the method for claim 1 is characterized in that, the time span of this predetermined video data is greater than 2.5 key video sequence frame pitch in step (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610011566XA CN100518311C (en) | 2006-03-27 | 2006-03-27 | Method for reducing response time of direct broadcast band switchover |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610011566XA CN100518311C (en) | 2006-03-27 | 2006-03-27 | Method for reducing response time of direct broadcast band switchover |
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| Publication Number | Publication Date |
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| CN101047838A CN101047838A (en) | 2007-10-03 |
| CN100518311C true CN100518311C (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200610011566XA Expired - Fee Related CN100518311C (en) | 2006-03-27 | 2006-03-27 | Method for reducing response time of direct broadcast band switchover |
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Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101132521A (en) * | 2007-09-25 | 2008-02-27 | 华为技术有限公司 | Method and device for switching IPTV channels |
| CN101198025A (en) * | 2007-12-28 | 2008-06-11 | 华为技术有限公司 | Method and device for improving network television user experience |
| CN101534475B (en) * | 2008-03-10 | 2012-02-01 | 联想移动通信科技有限公司 | Streaming media service receiving device, method and mobile terminal thereof |
| CN101742269A (en) * | 2008-11-17 | 2010-06-16 | 华为技术有限公司 | Channel switching over method, device and system |
| CN101742175B (en) * | 2008-11-18 | 2012-04-04 | 华为技术有限公司 | Method and device for finding quick channel switching service |
| CN101753973B (en) * | 2008-12-12 | 2013-01-02 | 华为技术有限公司 | Channel switching method, device and system |
| CN101489101B (en) * | 2008-12-31 | 2011-01-19 | 华为技术有限公司 | Method, apparatus and system for IP television channel switching processing |
| CN102487392A (en) * | 2010-12-01 | 2012-06-06 | 深圳市同洲软件有限公司 | Method, device and system for interaction between digital television receiving terminal and mobile terminal |
| CN102761773A (en) * | 2012-07-03 | 2012-10-31 | Ut斯达康通讯有限公司 | Method for improving user experience of IPTV (Internet Protocol Television) service by using I frames |
| CN102984561A (en) * | 2012-11-09 | 2013-03-20 | 中山爱科数字科技股份有限公司 | Data cache method for obtaining information service through digital set-top box |
| CN102970585B (en) * | 2012-11-30 | 2015-01-14 | 武汉市烽视威科技有限公司 | Method for quick channel switching of streaming media |
| CN104426875A (en) * | 2013-09-02 | 2015-03-18 | 中兴通讯股份有限公司 | Fast channel change method, server and system |
| CN104093070B (en) * | 2014-07-22 | 2017-05-10 | 中国科学院软件研究所 | Channel switching accelerating method and channel ethnic group marking method in video multicast network system |
| CN104768033B (en) * | 2015-04-15 | 2017-09-19 | 广州市汉融软件有限公司 | A kind of channels of network TV fast switch over method and system based on preloading |
| CN107431723A (en) * | 2015-05-13 | 2017-12-01 | 谷歌公司 | Broadcast TV channel surfing is imitated for on-demand content |
| CN105763941A (en) * | 2016-03-02 | 2016-07-13 | 深圳市茁壮网络股份有限公司 | Channel switching method and system |
| CN107483976A (en) * | 2017-09-26 | 2017-12-15 | 武汉斗鱼网络科技有限公司 | Live management-control method, device and electronic equipment |
| CN108540819B (en) * | 2018-04-12 | 2020-04-03 | 腾讯科技（深圳）有限公司 | Live broadcast data processing method and device, computer equipment and storage medium |
| CN110809168A (en) * | 2018-08-06 | 2020-02-18 | 中兴通讯股份有限公司 | Video live broadcast processing method and device, terminal and storage medium |
| CN111935507A (en) * | 2020-08-19 | 2020-11-13 | 上海连尚网络科技有限公司 | Video switching method and device |
| CN115883916A (en) * | 2022-12-09 | 2023-03-31 | 北京数码视讯软件技术发展有限公司 | Media channel switching method and device and electronic equipment |
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| CN101047838A (en) | 2007-10-03 |
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