CN102244775A - Digital video recorder (DVR) and network bandwidth control method thereof - Google Patents
Digital video recorder (DVR) and network bandwidth control method thereof Download PDFInfo
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Abstract
The invention relates to the field of video monitoring, and discloses a digital video recorder (DVR) and a network bandwidth control method thereof. In the invention, after receiving a remote playback or remote download request, the DVR closes all the existing remote previews so as to ensure normal remote playback or remote download in the case of lower total bandwidth; in the case of insufficient bandwidth, the earliest remote preview is deleted; and during the process of remote playback or remote download of the DVR, only an I-frame and an audio frequency frame are extracted and sent for all or part of program stream so as to further lower the demand of remote playback or remote download for the bandwidth.
Description
Technical field
The present invention relates to field of video monitoring, the network bandwidth control technology of the particularly long-range preview of digital video recorder, playback and download.
Background technology
Digital video recorder (Digital Video Recorder, be called for short " DVR ") be the high-tech product that computer technology, network technology, digital video technology and conventional video, security and guard technology combine, has high technology content, be Digital video disc (Digital Video Disk, abbreviation " DVD "), the regeneration product of magnetic tape type video tape recorder, can be applicable to fields such as electric power remote monitoring, bank's guard monitor, intelligent building, home security monitoring, have vast market prospect.The basic function of digital video recorder is that the audio-video signal of will simulate changes (the Moving Picture Experts Group of Motion Picture Experts Group into, be called for short " MPEG ") digital signal is stored on the storage medium (as hard disk), and provide and record, broadcast and the corresponding function of managing programm.
Remote monitoring is the supervision to environment and the computer system and the network equipment, promptly refers to by the network acquired information to be main, and by network remote computer is carried out method of operating.Also comprise the control to the network equipment simultaneously, most of now network equipments are all supported Telnet, even the Web mode carries out telemanagement to it, and this also is a kind of method of Long-distance Control.
The data memory format standard MPEG-2 of digital video recorder was formulated in 1994, adapted to the image quality of advanced industrial standard and higher transfer rate.Except the specified value as DVD, MPEG-2 also can be used for being broadcasting, cable television network, and cable system and direct broadcasting satellite provide the digital video of broadcast level.MPEG-2 also can provide a wider scope to change compression ratio in addition, to adapt to the different pictures quality, memory capacity, and the requirement of bandwidth.
The encoding code stream of MPEG-2 is divided into six levels.Be presentation code data better, MPEG-2 has stipulated a level structure with sentence structure.It is divided into six layers, is respectively from top to bottom: image sequence layer, image sets (Group Of Pictures is called for short " GOP "), image, macro block bar, macro block, piece.The coded image of MPEG-2 is divided into three classes, is called the I frame, P frame and B frame.The I two field picture adopts intraframe coding method, is mainly used in the initialization of receiver and obtaining of channel, and the switching of program and insertion.P frame and B two field picture adopt inter-frame encoding, and the P two field picture adopts the forward direction time prediction, and each macro block that can improve in compression efficiency and picture quality and the frame can be a forward prediction, also can be intraframe coding.The B two field picture adopts two-way time prediction, can improve compression multiple greatly.
The present inventor finds, the digital video recorder remote monitoring function is because the factors such as network bandwidth limitations of network environment, digital video recorder itself, if carry out remote monitoring by prior art, to be easy to generate the network card transmission technology bottleneck problems such as clogging of pausing, adapting to from the arrowband to the broadband arbitrarily, the Video service such as visit of the network bandwidth, low delay and high-quality, support website service form are the key technical problems of current DVR technical field.
Summary of the invention
The object of the present invention is to provide a kind of digital video recorder, comprising:
Previewing module is used to provide long-range preview;
Playback downloading control module is used to control long-range playback and remote download;
The bandwidth control module, be used for when playback downloading control module is received long-range playback or remote download request, whether exist long-range preview, if currently have a long-range preview, then indicate this previewing module to interrupt all already present long-range previews if judging that previewing module is current.
Maximum bandwidth is provided with module, is used to be provided with described maximum bandwidth thresholding.
The present invention also comprises the authority judge module, is used to judge the authority of long-distance user's preview, playback or download.
Embodiments of the present invention also provide a kind of digital video recorder and network bandwidth control method thereof, can be under the lower conditions of total bandwidth, guarantee that long-range playback or remote download normally carry out.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of network bandwidth control method of digital video recorder, may further comprise the steps:
When digital video recorder is received long-range playback or remote download request, judge the current long-range preview that whether exists;
If currently have a long-range preview, then interrupt all already present long-range previews.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
DVR closes all existing long-range previews when receiving long-range playback or remote download request, can be under the lower condition of total bandwidth, guarantee that long-range playback or remote download normally carry out.
Further, when bandwidth was not enough, the long-range preview deletion that DVR will create the earliest can guarantee that up-to-date long-range preview is achieved.
Further, when DVR carries out long-range playback or remote download, all or part of program stream is only extracted and sends bag I frame and audio frame, can further reduce long-range playback or remote download needs to bandwidth, under the lower condition of total bandwidth, assurance multi-channel long playback or remote download are normally carried out.
Further, when the quantity of long-range playback or remote download surpasses thresholding, all or part of program stream is only extracted and sends bag I frame and audio frame, both can satisfy all users' basic need again the user for a long time long-range playback or remote download user after a little while for it provides high-quality video.
Description of drawings
Fig. 1 is the system configuration schematic diagram of digital video recorder in the four embodiment of the invention.
Fig. 2 is the schematic flow sheet of network bandwidth control method in the first embodiment of the invention;
Fig. 3 (a) is that schematic flow sheet is interrupted in the priority rule preview of network bandwidth control method in the first embodiment of the invention;
Fig. 3 (b) is that the FIFO rule of network bandwidth control method in the first embodiment of the invention is interrupted the preview schematic diagram;
Fig. 4 is that schematic flow sheet is downloaded in take out frame or the playback of network bandwidth control method in the second embodiment of the invention;
Fig. 5 is a kind of schematic flow sheet of adjusting the program stream send mode according to the linking number of long-range playback and download of network bandwidth control method in the third embodiment of the invention;
Fig. 6 is the another kind of network bandwidth control method in the third embodiment of the invention is adjusted the program stream send mode according to the linking number of long-range playback and download a schematic flow sheet;
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim technical scheme required for protection among the application.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
The present invention relates to a kind of digital video recorder.
Fig. 1 is a kind of system configuration schematic diagram of this digital video recorder, and this digital video recorder comprises:
Previewing module is used to provide long-range preview.
Playback downloading control module is used to control long-range playback and remote download.
The bandwidth control module has following effect:
When playback downloading control module is received long-range playback or remote download request, judge that previewing module is current and whether have long-range preview, if currently have a long-range preview, then indicate this previewing module to interrupt all already present long-range previews.
When previewing module is received long-range preview request, judge whether playback downloading control module is in the state that carries out long-range playback or remote download, if then indicate this long-range preview request of previewing module refusal.
Receive long-range preview request in previewing module, and when playback downloading control module is not in the state that carries out long-range playback or remote download, judge that the current network bandwidth that has taken adds the code check of this new long-range preview request, whether surpass the maximum bandwidth thresholding that sets in advance, if do not have to surpass the maximum bandwidth thresholding set in advance then indicate previewing module to increase this preview newly, if surpass the maximum bandwidth thresholding that sets in advance, order after then indicating previewing module by before arriving of time, reject existing long-range preview successively, add up to the current network bandwidth that has taken and the code check of this new long-range preview request to be less than or equal to the maximum bandwidth thresholding that sets in advance.
Maximum bandwidth is provided with module, is used to be provided with the maximum bandwidth thresholding.
The authority judge module, the authority when being used for long-distance user's preview or playback download request is judged.
In these modules, previewing module, playback downloading control module and bandwidth control module are essential, and other module is optional.
Take out frame module, be used for the I frame and the audio frame of program stream are extracted.
Playback downloading control module is when carrying out long-range playback or remote download, for at least one program stream, by taking out frame module I frame and audio frame in the program stream are extracted, send the program stream that only comprises I frame and audio frame to the request end of long-range playback or remote download.
First embodiment of the invention relates to a kind of network bandwidth control method of digital video recorder.
As shown in Figure 2, the network bandwidth control method of this digital video recorder may further comprise the steps:
In step 101, when receiving the request from Terminal Server Client, the type of judging request is long-range preview request, long-range playback request, or remote download request.
If long-range preview request then enters step 102; If long-range playback request or remote download request then enter step 108.
In step 102, judge the current long-range playback downloading task that whether existed.
If then enter step 103; If not, then enter step 104.
In step 103, refuse this preview request, after this process ends.
When digital video recorder is in the state that carries out long-range playback or remote download,, then refuse this long-range preview request if receive long-range preview request.Can guarantee that so current ongoing long-range playback or remote download can have enough bandwidth operations.
Long-range preview request can be continued periodically to send, up to being accepted by DVR in the request end of long-range preview after being refused by DVR.This request can be to send with the fixed cycle, also can be the cycle of on-fixed, and for example, after being rejected, lengthening is the time interval of request next time, reaches the predefined upper limit up to the current time interval at every turn.
In step 104, time started and code check that the record preview connects.
After this enter step 105, judge whether the current occupied bandwidth and the code check sum of this new long-range preview request surpass the maximum bandwidth thresholding.
When digital video recorder is not in the state that carries out long-range playback or remote download, if receive new long-range preview request, judge that then the current network bandwidth that has taken adds the code check of this new long-range preview request, whether surpass the maximum bandwidth thresholding that sets in advance
If then enter step 106; If not, then enter step 107.
Judge the current network bandwidth that has taken when digital video recorder and add that the code check of this new long-range preview request surpasses the maximum bandwidth thresholding that sets in advance, then by the order after before the arriving of time, reject existing long-range preview successively, add up to the current network bandwidth that has taken and the code check of this new long-range preview request to be less than or equal to the maximum bandwidth thresholding that sets in advance.
If there is not to surpass the maximum bandwidth thresholding that sets in advance, then newly-increased this preview.
In step 106, interrupt preview successively according to priority rule.Specifically,
When bandwidth is not enough, the long-range preview deletion that priority is minimum.If it is a plurality of that the long-range preview of lowest priority has, then will be wherein the earliest long-range preview deletion, can guarantee that up-to-date long-range preview is achieved.
After this enter step 107, because bandwidth is enough, so allow preview.
In step 108, judge current long-range playback or the remote download task of whether having existed.
If then enter step 109; If not, then enter step 111.
In step 109, interrupt all previews.
When digital video recorder is received long-range playback or remote download request,, then interrupt (or rejecting) all already present long-range previews if currently have a long-range preview, can be under the lower condition of total bandwidth, guarantee that long-range playback or remote download normally carry out.
After this enter in the step 110, allow playback to download, after this process ends.
In step 111, the refusal playback is downloaded, after this process ends.When long-range playback or remote download are arranged, refuse new long-range playback or remote download request, can guarantee that original long-range playback or remote download finish as early as possible.
In another example of invention, be judged to be under the situation that has long-range playback or remote download in step 108, under execution in step 111 not, but execution in step 110, like this original long-range playback or remote download can be subjected to certain influence, but new long-range playback or remote download can be performed as early as possible.
In the flow process shown in Figure 2, the most basic step is 102,103 and 107, and other step all is to play the optional step of optimization function.
As an example of the present invention, can be each path setting priority in advance, when receiving new long-range preview request, if the current network bandwidth that has taken adds the code check of this new long-range preview request and surpasses the maximum bandwidth limit that sets in advance, then can be according to priority from low to high order, reject existing long-range preview successively, add up to the current network bandwidth that has taken the code check of this new long-range preview request to be less than or equal to the maximum bandwidth thresholding that sets in advance.If it is a plurality of that the long-range preview of lowest priority has, then can by the time before to after order reject successively.
In the present embodiment, the substep during step 106 and 107 may further include shown in Fig. 3 (a).
In step 201, give path setting passage priority.This step can be carried out in advance, needn't carry out at every turn.
After this enter step 202, digital video recorder bandwidth control module is interrupted current long-range preview according to path setting passage priority, the network bandwidth that has taken up to the long-range preview of current residual adds the code check of this new long-range preview request, is less than or equal to the maximum bandwidth thresholding that sets in advance.
After this enter step 203, the bandwidth control module judges whether the current occupied bandwidth and the code check sum of this new long-range preview request surpass the maximum bandwidth thresholding that maximum bandwidth is provided with the module setting.
If then return step 202; If not, then enter step 204.
Long-range preview or playback download request end can continue periodically to send long-range preview or playback download request, up to being accepted by DVR after being refused by DVR.This request can be to send with the fixed cycle, also can be the cycle of on-fixed, and for example, after being rejected, lengthening is the time interval of request next time, up to the upper limit that reaches the time interval at every turn.
In step 204, the bandwidth control module allows playback to download (this step is a step 107), after this process ends.
In the present embodiment, the preview priority of interrupt rule as in the preview flow process of a preference of described network bandwidth control method shown in Fig. 2 (b), specifically describes as follows:
1 is divided into N with all passage priority, wherein N ∈ N
+
2 are labeled as i respectively for each passage, i ∈ (0...N-1) wherein, and correspondingly, this passage priority is configured to i, and the priority of passage i is greater than passage i-1.
3 previews or playback downloading task enter the passage that priority-labeled is i successively.
If 4 current occupied bandwidths surpass the maximum bandwidth thresholding that maximum bandwidth is provided with the module setting with the code check sum of this new long-range preview request, then by the order after before the arriving of time, be first-in first-out rule (the First In First Out in the formation, be called for short " FIFO "), reject existing long-range preview successively, promptly the preview of the left side passage shown in Fig. 3 (b) or playback downloading task are interrupted (rejecting) earlier, add the code check of this new long-range preview request up to the current network bandwidth that has taken, be less than or equal to the maximum bandwidth thresholding that sets in advance, promptly the current residual network channel can satisfy the current preview that increases newly or the playback downloading task is achieved.
When bandwidth was not enough, the long-range preview deletion with the earliest can guarantee that up-to-date long-range preview is achieved.
In addition, be appreciated that, the priority rule that preview involved in the present invention is rejected can be understood as other priority rule, as when facing the overweight low bandwidth of offered load, can be according to using (LRU) rule etc. recently at most, wherein LRU long-range preview or the playback download request selecting not responded at most recently interrupted (rejecting); For offered load just often, can be according to the locality rule etc., wherein, the locality rule is meant, to what some often used passage high priority, the overall like this network utilization that improved is set.
Second embodiment of the invention relates to a kind of network bandwidth control method of digital video recorder.
Second execution mode improves on the basis of first execution mode, main improvements are: when DVR carries out long-range playback or remote download, all or part of program stream is only extracted and sends bag I frame and audio frame, can further reduce long-range playback or remote download needs to bandwidth, under the lower condition of total bandwidth, assurance multi-channel long playback or remote download are normally carried out.
Specifically, as shown in Figure 4, main improvements may further comprise the steps in the present embodiment:
In step 301, it is to be undertaken by time or file mode that playback is downloaded.
If, then enter step 302 by the time; If press file, then enter step 307.
In step 302, whether the judgement current file sends and finishes.
If not, then enter step 303; If, process ends then;
In step 303, judge whether the passage under this document needs to take out frame.
If then enter step 304; If not, then enter step 305.
In step 304, extract B frame and P frame and only stay I frame and audio frame.
When digital video recorder carries out long-range playback or remote download,, I frame and audio frame in the program stream are extracted, send the program stream that only comprises I frame and audio frame to the request end of long-range playback or remote download at least one program stream.
In step 305, do not take out keyframe playback, i.e. normal playback.
After this enter step 306, a file playback finishes, and after this returns step 302.
In step 307, judge whether the passage under this document needs to take out frame.
If then enter step 308; If not, then enter step 309.
In step 308, extract the BP frame and only stay I frame and audio frame.
In step 309, do not take out keyframe playback, i.e. normal playback.
After this count step 310, a file playback finishes, after this process ends.
In addition, step 304 and 305 can be understood as and carries out " taking out frame " operation.
Third embodiment of the invention relates to a kind of network bandwidth control method of digital video recorder.
The 3rd execution mode improves on the basis of second execution mode, the main improvement is: when the quantity of long-range playback or remote download surpasses thresholding, all or part of program stream is only extracted and sends bag I frame and audio frame, both can satisfy all users' basic need again the user for a long time long-range playback or remote download user after a little while for it provides high-quality video.Specifically:
When digital video recorder is received the request of long-range playback or remote download, judge whether the current number of connection that carries out long-range playback or remote download reaches the first predetermined thresholding, if, then when setting up new long-range playback or remote download, all or part of program stream for the needs transmission, I frame and audio frame in the program stream are extracted, send the program stream that only comprises I frame and audio frame to the request end of long-range playback or remote download.
Also can be according to configuration, the program stream of dedicated tunnel is taken out the I frame, to the program stream normal play of other passage.Can also carry out the configuration of priority in advance to each passage, when the current number of connection that carries out long-range playback or remote download reaches predetermined first thresholding, only priority is lower than the program stream of specified level, wherein I frame and audio frame are extracted, send the program stream that only comprises I frame and audio frame to corresponding request end.
Described network bandwidth control method is in the long-range mode that can send program stream in frame or the playback download flow process according to the linking number adjustment of long-range playback and download of taking out, and as shown in Figure 5, concrete steps are as follows:
In step 401, receive a playback download request.
After this enter step 402, judge current already present playback download network connects whether reach first thresholding.
If then enter step 403; If not, then enter step 406;
In step 403, carry out file and take out the frame operation.
After this enter step 404, send I frame and audio frame program stream (Program stream is called for short " PS ").
After this enter step 405, judge whether this playback download finishes.
If then enter step 406; If not, then return step 403.
In step 406, normally send PS, after this process ends.
Further, when digital video recorder finishes a long-range playback or remote download, judge that whether the current number of connection of long-range playback or remote download that carries out is less than second thresholding, if, then finish extraction, send normal program stream to the request end of long-range playback or remote download to I frame and audio frame in the program stream.
Wherein first thresholding is more than or equal to second thresholding.
As shown in Figure 6, concrete steps are as follows:
In step 501, receive a long-range playback download request.
After this enter step 502, suppose that current long-range playback download network number of connection has reached first thresholding.
After this enter step 503, take out the frame operation.
After this enter step 504, send I frame and audio frame PS.
After this enter step 505, a playback is downloaded and is finished.
After this enter step 506, judge that whether current long-range playback download network number of connection is less than second thresholding.
If then enter step 507; If not, then return step 503.
In step 507, because the network linking number of current long-range playback or download is less, thus recover the normal PS of transmission, so that long-range playback of current each or download can obtain the video of more details, after this process ends.
In addition, also can extract I frame and audio frame by the PS stream of analyzing the PS encapsulation format.PS stream or file can be considered as a plurality of PS GOP, and each GOP is that the information between each GOP does not have interdependency, can shear splicing with the initial multiframe set of I frame.A PS GOP is made up of one or more PS bags, comprises a PSH and several PES in the PS bag, and first PS bag of each PS GOP should be followed a PSM bag immediately behind the PSH of packet header.The PSM bag is a kind of special P ES, contains the description to other PES load data types.In long-range playback, when downloading, analyze the video file code stream, determine that by PSM the frame of present analysis is the I frame, whether distinguish by the PES type is frame of video, audio frame.Just can extract the I frame according to PSH, PSM and PES like this, according to the type extraction audio frame of PSH and PES.
Each method execution mode of the present invention all can be realized in modes such as software (program), hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium or the like).Equally, memory can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
The second or the 3rd execution mode is and the corresponding method execution mode of present embodiment, present embodiment can with the enforcement of working in coordination of the second or the 3rd execution mode.The correlation technique details of mentioning in the second or the 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in the second or the 3rd execution mode.
Need to prove, each module of mentioning in the execution mode of each digital video recorder of the present invention all is a logic module, physically, a logic module can be a physical module, it also can be the part of a physical module, can also realize that the physics realization mode of these logic modules itself is not most important with the combination of a plurality of physical modules, the combination of the function that these logic modules realized is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, the execution mode of above-mentioned each digital video recorder of the present invention will not too close module not introduced with solving technical problem relation proposed by the invention, and this does not show the module that does not have other of above-mentioned each digital video recorder.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a digital video recorder is characterized in that, comprising:
Previewing module is used to provide long-range preview;
Playback downloading control module is used to control long-range playback and remote download;
The bandwidth control module, be used for when described playback downloading control module is received long-range playback or remote download request, whether exist long-range preview, if currently have a long-range preview, then indicate this previewing module to interrupt all already present long-range previews if judging that described previewing module is current.
2. digital video recorder according to claim 1, it is characterized in that, described bandwidth control module also is used for, when described previewing module is received long-range preview request, judge whether described playback downloading control module is in the state that carries out long-range playback or remote download, if then indicate described this long-range preview request of previewing module refusal.
3. digital video recorder according to claim 2, it is characterized in that, described bandwidth control module also is used for, receive long-range preview request in described previewing module, and when described playback downloading control module is not in the state that carries out long-range playback or remote download, judge that the current network bandwidth that has taken adds the code check of this new long-range preview request, whether surpass the maximum bandwidth thresholding that sets in advance, if do not have to surpass the maximum bandwidth thresholding set in advance then indicate described previewing module to increase this preview newly, if surpass the maximum bandwidth thresholding that sets in advance, order after then indicating described previewing module by before arriving of time, reject existing long-range preview successively, add up to the current network bandwidth that has taken and the code check of this new long-range preview request to be less than or equal to the maximum bandwidth thresholding that sets in advance;
Comprise also in the described digital video recorder that maximum bandwidth is provided with module, be used to be provided with described maximum bandwidth thresholding.
4. according to each described digital video recorder in the claim 1 to 3, it is characterized in that, also comprise:
Take out frame module, be used for the I frame and the audio frame of program stream are extracted;
Described playback downloading control module is when carrying out long-range playback or remote download, for at least one program stream, by the described frame module of taking out I frame and audio frame in the program stream are extracted, send the program stream that only comprises I frame and audio frame to the request end of long-range playback or remote download.
5. the network bandwidth control method of a digital video recorder is characterized in that, may further comprise the steps:
When digital video recorder is received long-range playback or remote download request, judge the current long-range preview that whether exists;
If currently have a long-range preview, then interrupt all already present long-range previews.
6. the network bandwidth control method of digital video recorder according to claim 5 is characterized in that, and is further comprising the steps of:
When described digital video recorder is in the state that carries out long-range playback or remote download,, then refuse this long-range preview request if receive long-range preview request.
7. the network bandwidth control method of digital video recorder according to claim 6 is characterized in that, and is further comprising the steps of:
When described digital video recorder is not in the state that carries out long-range playback or remote download, if receive new long-range preview request, judge that then the current network bandwidth that takies adds the code check of this new long-range preview request, whether surpass the maximum bandwidth thresholding that sets in advance;
If there is not to surpass the maximum bandwidth thresholding that sets in advance, then newly-increased this preview;
If surpass the maximum bandwidth thresholding that sets in advance, then by the order after before the arriving of time, reject existing long-range preview successively, add up to the current network bandwidth that has taken the code check of this new long-range preview request to be less than or equal to the maximum bandwidth thresholding that sets in advance.
8. according to the network bandwidth control method of each described digital video recorder in the claim 5 to 7, it is characterized in that, further comprising the steps of:
When described digital video recorder carries out long-range playback or remote download,, I frame and audio frame in the program stream are extracted, send the program stream that only comprises I frame and audio frame to the request end of long-range playback or remote download at least one program stream.
9. the network bandwidth control method of digital video recorder according to claim 8 is characterized in that, and is further comprising the steps of:
When described digital video recorder is received the request of long-range playback or remote download, judge whether the current number of connection that carries out long-range playback or remote download reaches the first predetermined thresholding, if, then when setting up new long-range playback or remote download, all or part of program stream for the needs transmission, I frame and audio frame in the program stream are extracted, send the program stream that only comprises I frame and audio frame to the request end of long-range playback or remote download.
10. the network bandwidth control method of digital video recorder according to claim 9, it is characterized in that, when described digital video recorder finishes a long-range playback or remote download, judge that whether the current number of connection of long-range playback or remote download that carries out is less than second thresholding, if, then finish extraction, send normal program stream to the request end of long-range playback or remote download to I frame and audio frame in the program stream;
Wherein first thresholding is more than or equal to second thresholding.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106658203A (en) * | 2015-11-02 | 2017-05-10 | 天脉聚源（北京）科技有限公司 | WeChat shaking video content display method and system thereof |
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