CN101917591A - Method and device for playing back live video - Google Patents
Method and device for playing back live video Download PDFInfo
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- CN101917591A CN101917591A CN2009102428145A CN200910242814A CN101917591A CN 101917591 A CN101917591 A CN 101917591A CN 2009102428145 A CN2009102428145 A CN 2009102428145A CN 200910242814 A CN200910242814 A CN 200910242814A CN 101917591 A CN101917591 A CN 101917591A
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Abstract
The invention provides a method and a device for playing back a live video and aims to solve the problem that playback with any duration cannot be realized by the conventional direct broadcasting system. Direct broadcasting data is cached at a service end, so that a server can transmit corresponding video data to a user computer from a cache and play back the live video with no duration limitation when a user requests to play back the live video which is played. Therefore, the user can watch important contents repeatedly in real time without missing any wonderful clip.
Description
Technical field
The present invention relates to the living broadcast of programs technical field, particularly relate to a kind of back method and device of live video.
Background technology
Live is exactly the broadcast mode that the later stage is synthetic, broadcast is carried out simultaneously of broadcast TV program.Online Video is live to be exactly the live broadcast service of utilizing Internet resources to carry out, and the video capture by the scene uploads on the network synchronously, and the user can see the scene consulting of the very first time the same time on network.The live broadcast service of this network is widely used in network direct broadcasting services such as the news briefing carried out in real time, exhibition, product issue, product recommendations, sale outpost display, network concert, company's cocktail party, business meetings, celebration ceremony, program performance, movies-making, sports tournament, security analysis, long-distance education.
Now, many BroadVision WEBTVs are based on advanced stream media technology exploitation and form.So-called Streaming Media is meant the media formats that the mode of employing stream transmission is play at Internet.The stream transmission mode then is that multimedia files such as whole A/V and 3D are divided into compressed package one by one through special compress mode,, in real time transmission continuous to subscriber computer by video server.In the system that adopts the stream transmission mode, the user needn't wait until as adopting downloading mode that whole download of whole file finishes, but only need can play behind the multimedia file decompress(ion)s such as A/V, 3D that utilize decompression apparatus (hardware or software) to compression on the user's computer and watch through the startup time-delay of seconds or tens of seconds.The remainder of multimedia file will continue to download in the server on backstage this moment.
Usually, adopt the live of stream media technology realization, the subscriber computer end is continuous, real-time reception live data, and the user can watch the current live video that transmits, and promptly watches along with live progress.But if the video that the user has broadcasted before having missed thinks that playback replays, present live broadcast system can't realize.Even some live broadcast systems can realize, also be since this live broadcast system at subscriber computer end buffer memory the sub-fraction live data, wait after this part data cached playing, have new live data in the buffer memory again and deposit in and override former data.Therefore, the sub-fraction live data of user in can only the playback buffer memory, and this part data is very limited, and very short and small usually, can not satisfy the user and repeat to watch the demand of broadcast content.
Summary of the invention
Technical problem to be solved by this invention provides a kind of back method and device of live video, can't realize the problem of any duration playback to solve present live broadcast system.
In order to address the above problem, the invention discloses a kind of back method of live video, comprising:
The buffer memory live video;
Receive the playback request that the user sends;
According to described request, from buffer memory, obtain corresponding live video, and send to the user.
Preferably, described buffer memory comprises:
Each key frame in the described live video is set up index information, and set up the corresponding relation of index information and live video;
Described index information and live video are carried out buffer memory respectively.
Wherein, comprise the time point of video playback in the described request, the time point of described video playback is corresponding with key frame.
Preferably, according to described request, from buffer memory, obtain corresponding live video and comprise:
According to described index information, the corresponding key frame of video playback time point of searching and asking;
Begin to obtain live video from this key frame position.
Preferably, send to after the user, also comprise:
Begin to play live video from this key frame position.
The present invention also provides a kind of playback reproducer of live video, comprising:
Cache module is used for the buffer memory live video;
The request receiver module is used to receive the playback request that the user sends;
Data acquisition module is used for according to described request, obtains corresponding live video from cache module.
Data transmission module, the live video that is used for being obtained sends to the user.
Preferably, described cache module comprises:
Set up indexing units, be used for each key frame of described live video is set up index information, and set up the corresponding relation of index information and live video;
Buffer unit is used for described index information and live video are carried out buffer memory respectively.
Wherein, comprise the time point of video playback in the described request, the time point of described video playback is corresponding with key frame.
Preferably, described data acquisition module comprises:
Retrieval unit is used for according to described index information, the corresponding key frame of video playback time point of searching and asking;
Data-reading unit is used for beginning to obtain live video from this key frame position.
Compared with prior art, the present invention has the following advantages:
The present invention has been owing to carried out buffer memory at server end to live data, and therefore when the user asked live video that playback broadcasted, server can be passed to subscriber computer with the corresponding video data from buffer memory, carry out unlimited long direct playing and playback.Like this, the user just can repeatedly repeat to watch important content in real time, and can not miss the fragment of any excellence.
Description of drawings
Fig. 1 is the back method flow chart of the embodiment of the invention one described a kind of live video;
Fig. 2 is the back method flow chart of the embodiment of the invention two described a kind of live videos;
Fig. 3 is the playback reproducer structure chart of the embodiment of the invention three described a kind of live videos.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Along with the development of network direct broadcasting, increasing user watches various programme televised lives by network.But because live particularity, in a single day the user misses live time point, just can't review again, can only wait until that live finishing watches the fragment of missing again in the mode of program request afterwards.
The invention provides a kind of live scheme of time shift playback arbitrarily, the user can carry out the direct playing and playback of endless time shift distance in live process.Be elaborated below by embodiment.
Embodiment one:
With reference to Fig. 1, be the back method flow chart of the embodiment of the invention one described a kind of live video.
Live process is: collection in worksite audio, video data at first, then the audio, video data that collects is encoded, and generate files in stream media, direct broadcast server is passed to subscriber computer in real time with files in stream media and is play then.In this process, direct broadcast server is as follows for the processing of direct playing and playback:
In live process, when direct broadcast server is directly passed to the subscriber computer broadcast with the files in stream media of making, also can be buffered in files in stream media on the server, this is the outstanding feature that the present invention is different from prior art.In the prior art, direct broadcast server does not carry out buffer memory to files in stream media.
The user if missed certain section live just now content, perhaps thinks to watch again live just now wonderful when watching live video, then can back drag the progress bar of player, and at this moment this player has just sent playback request to direct broadcast server.
After direct broadcast server is received playback request since in buffer memory, stored all just at live files in stream media, so can with just now the video of live mistake from buffer memory, read again, pass to the player on the subscriber computer.
In the above-mentioned flow process, the duration of video playback only is subjected to the restriction of server buffer capacity, therefore under the enough big situation of server buffer capacity, can realize the direct playing and playback of any duration.Like this, the user just can repeatedly repeat to watch important content in real time, and can not miss the fragment of any excellence.
Embodiment two:
Present embodiment is a preferred embodiment, on the basis of embodiment one, provides a kind of caching technology based on the key frame index, has further realized the accurate location of time shift playback.
With reference to Fig. 2, be the back method flow chart of the embodiment of the invention two described a kind of live videos.
Server at first was divided into a plurality of sections with file according to key frame before the buffer memory video file, described section can be understood as data block, was about to a whole file and was divided into a plurality of data blocks by key frame.
Wherein, frame is the least unit of stream medium data, key frame is special frame, be used for defining the variation in the video image, it is residing that frame of key operations in image motion or the variation, comprise motion of objects and characteristics (as size and color), the interpolation that interpolation or deletion object and frame move in scene etc.Whenever, when wishing image, the user changes, perhaps wish to take place certain action, must use key frame.Picture frame between key frame and the key frame can be created by software.
Key frame in each video file is set up after the index, also needed corresponding video file to set up secondary index, promptly first order index can find certain video file, and second level index can find certain key frame in this document.
Wherein, first order index can the video file name be set to indexing key words, and second level index can the key frame sign be set to indexing key words.
Comprise the time point of video labeling (as the video file name) and video playback in the described request, the time point of described video playback is corresponding with key frame.
Retrieval first order index can find the live video file that the user asks according to video labeling; Retrieval second level index according to the time point of video playback, can find the key frame position of beginning playback in this video file.
Step 205 begins to obtain live video from this key frame position, and sends to the user;
Server is directly from this key frame position, from the buffer memory reading video data, rather than reads the whole video file as prior art.
Step 206 begins to play live video from this key frame position.
After subscriber computer receives the server response,, promptly, play-over live just now video content from the time point of beginning playback from this key frame position.
Above-mentioned flow process has not only realized the direct playing and playback of any duration, and owing to adopted the stream microtomy during server buffer video file, therefore when carrying out the video playback of any duration, can accurately navigate to the playback duration point that the user needs, directly from key frame position that should time point is begun transmitting video data, the user does not need to take time and waits for the transmission and the broadcast of this key frame previous contents like this, just can be directly from live video arbitrary time point begin playback.
Embodiment three:
At said method embodiment, the present invention also provides corresponding device thereof embodiment.
With reference to Fig. 3, be the playback reproducer structure chart of the embodiment of the invention three described a kind of live videos.
Described device mainly is laid in the direct broadcast server end, can comprise with lower module:
Cache module 31 is used for the buffer memory live video;
Request receiver module 32 is used to receive the playback request that the user sends;
Data acquisition module 33 is used for according to described request, obtains corresponding live video from cache module 31.
Data transmission module 34, the live video that is used for being obtained sends to the user.
Described device has been owing to carried out buffer memory to live data, and therefore when the user asked live video that playback broadcasted, described device can be passed to subscriber computer with the corresponding video data from buffer memory, carry out unlimited long direct playing and playback.Like this, the user just can repeatedly repeat to watch important content in real time, and can not miss the fragment of any excellence.
Preferably, in another embodiment, the cache module 31 in the described device can also adopt the stream microtomy to carry out metadata cache, and therefore described cache module 31 can also comprise:
Set up indexing units, be used for each key frame of described live video is set up index information, and set up the corresponding relation of index information and live video;
Buffer unit is used for described index information and live video are carried out buffer memory respectively.
Like this, owing to comprise the time point of video playback in the described playback request, and the time point of described video playback is corresponding with key frame, and described data acquisition module 33 can further include:
Retrieval unit is used for according to described index information, the corresponding key frame of video playback time point of searching and asking;
Data-reading unit is used for beginning to obtain live video from this key frame position.
The described device of described preferred embodiment has not only been realized the direct playing and playback of any duration, but also quick, the accurate location of having realized live video, can accurately navigate to the position of certain key frame, the user does not need to take time and waits for the transmission and the broadcast of this key frame previous contents, just can be directly from video arbitrary time point begin playback.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For device embodiment, because it is similar substantially to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than to the back method and the device of a kind of live video provided by the present invention, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the back method of a live video is characterized in that, comprising:
The buffer memory live video;
Receive the playback request that the user sends;
According to described request, from buffer memory, obtain corresponding live video, and send to the user.
2. method according to claim 1 is characterized in that, described buffer memory comprises:
Each key frame in the described live video is set up index information, and set up the corresponding relation of index information and live video;
Described index information and live video are carried out buffer memory respectively.
3. method according to claim 2 is characterized in that:
The time point that comprises video playback in the described request, the time point of described video playback is corresponding with key frame.
4. method according to claim 3 is characterized in that, according to described request, obtains corresponding live video and comprise from buffer memory:
According to described index information, the corresponding key frame of video playback time point of searching and asking;
Begin to obtain live video from this key frame position.
5. method according to claim 4 is characterized in that, sends to after the user, also comprises:
Begin to play live video from this key frame position.
6. the playback reproducer of a live video is characterized in that, comprising:
Cache module is used for the buffer memory live video;
The request receiver module is used to receive the playback request that the user sends;
Data acquisition module is used for according to described request, obtains corresponding live video from cache module.
Data transmission module, the live video that is used for being obtained sends to the user.
7. device according to claim 6 is characterized in that, described cache module comprises:
Set up indexing units, be used for each key frame of described live video is set up index information, and set up the corresponding relation of index information and live video;
Buffer unit is used for described index information and live video are carried out buffer memory respectively.
8. device according to claim 7 is characterized in that:
The time point that comprises video playback in the described request, the time point of described video playback is corresponding with key frame.
9. device according to claim 8 is characterized in that, described data acquisition module comprises:
Retrieval unit is used for according to described index information, the corresponding key frame of video playback time point of searching and asking;
Data-reading unit is used for beginning to obtain live video from this key frame position.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102428145A CN101917591B (en) | 2009-12-17 | 2009-12-17 | Method and device for playing back live video |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102428145A CN101917591B (en) | 2009-12-17 | 2009-12-17 | Method and device for playing back live video |
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| CN101917591A true CN101917591A (en) | 2010-12-15 |
| CN101917591B CN101917591B (en) | 2012-11-14 |
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| CN103618912A (en) * | 2013-11-26 | 2014-03-05 | 乐视网信息技术（北京）股份有限公司 | Live telecast time shifting method and server |
| CN103699583A (en) * | 2013-12-05 | 2014-04-02 | 乐视网信息技术（北京）股份有限公司 | Method for realizing live broadcast time shifting, and electronic equipment |
| CN103945231A (en) * | 2014-05-19 | 2014-07-23 | 无锡天脉聚源传媒科技有限公司 | Streaming media ordered editing system and method |
| CN103959801A (en) * | 2011-11-24 | 2014-07-30 | 夏普株式会社 | Reproduction device, reproduction method, control program, and recording medium |
| CN104185072A (en) * | 2014-03-28 | 2014-12-03 | 无锡天脉聚源传媒科技有限公司 | Video playing method and device |
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| CN101202598A (en) * | 2006-12-30 | 2008-06-18 | 深圳市同洲电子股份有限公司 | Apparatus and method for audio playing |
| CN101202891A (en) * | 2007-03-05 | 2008-06-18 | 深圳市同洲电子股份有限公司 | Method and device for playing digital television program |
| CN101202900B (en) * | 2007-03-12 | 2010-09-29 | 深圳市同洲电子股份有限公司 | Method for switching living broadcast and playback of digital television and video server |
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| CN103959801A (en) * | 2011-11-24 | 2014-07-30 | 夏普株式会社 | Reproduction device, reproduction method, control program, and recording medium |
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| CN103618912A (en) * | 2013-11-26 | 2014-03-05 | 乐视网信息技术（北京）股份有限公司 | Live telecast time shifting method and server |
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| CN109348240A (en) * | 2018-10-25 | 2019-02-15 | 网易（杭州）网络有限公司 | Video broadcasting method, apparatus and system, electronic equipment and storage medium |
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