CN109889862B - Video distribution method and system - Google Patents
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Abstract
The embodiment of the invention provides a video distribution method and a video distribution system, wherein the method is applied to the video distribution system and comprises the following steps: each edge device sends a video acquisition request to the server according to a set sending mode in each distribution period; receiving and storing videos distributed by a server aiming at the video acquisition request; deleting the video received before a preset number of distribution cycles when the deletion opportunity is met; the server determines the target number of videos to be distributed to each edge device according to the video acquisition request sent by each edge device, and when the data volume of the target number of videos is not larger than the current available capacity of the edge device, selects different videos with different target numbers from the videos recorded in the video distribution list based on a preset distribution rule and distributes the videos to the edge device. The embodiment of the invention can effectively distribute the video and ensure that the video in the video distribution system always belongs to the video meeting the playing requirement of the user.
Description
Technical Field
The invention relates to the technical field of internet, in particular to a video distribution method and a video distribution system.
Background
In order to improve better video service, a video website usually constructs a video distribution system comprising a plurality of edge devices and servers, and then provides video service to users by using the video distribution system, wherein the edge devices are devices accessible to the users, that is, devices providing video service to the users. The server stores a video distribution list, and the video distribution list records each video serving as a distribution object and a preset number of copies of each video; further, the server distributes the video to each edge device based on the video distribution list and the storage capacity of each edge device. The preset number of copies is the number of copies set for meeting the playing requirement of the user. Meanwhile, since the storage space of the edge device is limited, deletion of the video in the edge device is involved in the process of video distribution in order to update the video in the edge device.
Currently, when deleting a video, a server gives a decision whether to delete the video according to a ratio of the number of playing copies to the number of copying copies of the video for each video, wherein the number of copying copies refers to: the total number of copies of a video currently stored in each edge device. However, the prior art has at least the following problems: although the server gives the decision whether to delete each video, in a particular application, each edge device will determine whether to respond to the decision given by the server based on its own video requirements. Therefore, videos deleted by each edge device may be inconsistent, so that videos with the stored number of copies not reaching the predetermined number of copies exist in the video distribution system, and the playing requirement of the user cannot be met.
Therefore, for a video distribution system, a video distribution method is needed to ensure that videos in the video distribution system always belong to videos meeting the playing requirements of users while videos are effectively distributed.
Disclosure of Invention
The embodiment of the invention aims to provide a video distribution method and a video distribution system, so that videos in the video distribution system are guaranteed to belong to videos meeting the playing requirements of users all the time while the videos are effectively distributed. The specific technical scheme is as follows:
in a first aspect, the present invention provides a video distribution method, which is applied to a video distribution system, where the video distribution system includes: the system comprises a server and a plurality of edge devices, wherein a video distribution list is stored in the server; the method comprises the following steps:
each edge device sends a video acquisition request to the server according to a set sending mode when entering each distribution period; after receiving the video distributed by the server aiming at the video acquisition request, saving the received video; when the deletion opportunity is met, deleting the videos received before a preset number of distribution cycles;
the server determines the target number of videos to be distributed to each edge device according to the received video acquisition request sent by each edge device, and when the data volume of the videos with the target number is judged to be not larger than the current available capacity of the edge device, the server selects different videos with the target number from the videos recorded in the video distribution list based on a preset distribution rule and distributes the selected videos to the edge device;
wherein the target number is determined based on the set sending mode, the maximum storage capacity of the edge device, a preset number of distribution cycles that the video can be reserved, and the size of each video recorded by the video distribution list;
wherein, the preset distribution rule is as follows: and distributing the respective copies of each video recorded by the video distribution list to different edge devices in one distribution period.
Optionally, the preset number is the same as the preset number of distribution cycles that the video can be retained.
Optionally, the set sending method is: in the distribution period, the edge device sends a video acquisition request to the server;
the determining the target number of videos to be distributed to the edge device includes:
calculating the total number of videos which are expected to be distributed to the edge device by the server in the distribution period based on the maximum storage capacity of the edge device, the preset number of distribution periods in which the videos can be reserved and the size of each video recorded by the video distribution list;
determining the total number calculated as: a target number of videos to be distributed to the edge device.
Optionally, the set sending method is: in the distribution period, the edge device periodically sends a plurality of video acquisition requests to the server; each video acquisition request comprises: a first number of videos that the edge device has currently received;
the determining the target number of videos to be distributed to the edge device includes:
if a video acquisition request sent by the edge device is received for the first time, calculating the total number of videos to be distributed to the edge device in the distribution period based on the maximum storage capacity of the edge device, the preset number of distribution periods in which the videos can be reserved and the size of each video recorded in the video distribution list; determining any number not exceeding the total number as: a target number of videos to be distributed to the edge device;
if the video acquisition request sent by the edge device is not received for the first time and not received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining any one of the quantities not exceeding the difference and greater than zero as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, not distributing the video to the edge device;
if a video acquisition request sent by the edge device is received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining the difference as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, no video is distributed to the edge device.
Optionally, the formula for calculating the total number is:
Vi＝Siv (T.times.M), where ViTo said total number, SiRepresents the maximum storage capacity of the edge device, T represents the preset number of distribution cycles that the video can be reserved, and M represents the size of each video recorded by the video distribution list.
Optionally, the method further comprises:
and after the server distributes the selected video to the edge device, updating the number of the selected video in the video distribution list based on the selected video.
Optionally, the method further comprises:
and when judging that the data volume of the target number of videos is larger than the current available capacity of the edge device, the server feeds back a message representing the failure of the video acquisition request to the edge device.
In a second aspect, an embodiment of the present invention provides a video distribution system, including: the system comprises a server and a plurality of edge devices, wherein a video distribution list is stored in the server;
each edge device is used for sending a video acquisition request to the server according to a set sending mode when entering each distribution period; after receiving the video distributed by the server aiming at the video acquisition request, saving the received video; when the deletion opportunity is met, deleting the videos received before a preset number of distribution cycles;
the server is used for determining the target number of videos to be distributed to each edge device according to the received video acquisition request sent by each edge device, and when the data volume of the videos with the target number is judged to be not larger than the current available capacity of the edge device, selecting different videos with the target number from the videos recorded in the video distribution list based on a preset distribution rule, and distributing the selected videos to the edge device;
wherein the target number is determined based on the set sending mode, the maximum storage capacity of the edge device, a preset number of distribution cycles that the video can be reserved, and the size of each video recorded by the video distribution list;
wherein, the preset distribution rule is as follows: and distributing the respective copies of each video recorded by the video distribution list to different edge devices in one distribution period.
Optionally, the preset number is the same as the preset number of distribution cycles that the video can be retained.
Optionally, the set sending method is: in the distribution period, the edge device sends a video acquisition request to the server;
the server is specifically configured to calculate, based on the maximum storage capacity of the edge device, a preset number of distribution cycles that videos can be reserved, and a size of each video recorded in the video distribution list, a total number of videos that the server expects to be distributed to the edge device in the distribution cycle; determining the total number calculated as: a target number of videos to be distributed to the edge device.
Optionally, the set sending method is: in the distribution period, the edge device periodically sends a plurality of video acquisition requests to the server; each video acquisition request comprises: a first number of videos that the edge device has currently received;
the server is specifically configured to, if a video acquisition request sent by the edge device is received for the first time, calculate, based on the maximum storage capacity of the edge device, a preset number of distribution cycles that the video can be reserved, and a size of each video recorded in the video distribution list, a total number of videos that the server expects to be distributed to the edge device in the distribution cycle; determining any number not exceeding the total number as: a target number of videos to be distributed to the edge device;
if the video acquisition request sent by the edge device is not received for the first time and not received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining any one of the quantities not exceeding the difference and greater than zero as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, not distributing the video to the edge device;
if a video acquisition request sent by the edge device is received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining the difference as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, no video is distributed to the edge device.
Optionally, the formula for calculating the total number is:
Vi＝Siv (T.times.M), wherein，ViTo said total number, SiRepresents the maximum storage capacity of the edge device, T represents the preset number of distribution cycles that the video can be reserved, and M represents the size of each video recorded by the video distribution list.
Optionally, the server is further configured to update the number of copies of the selected video in the video distribution list based on the selected video after distributing the selected video to the edge device.
Optionally, the server is further configured to feed back, to the edge device, a message indicating that the video acquisition request fails when it is determined that the data amount of the target number of videos is greater than the current available capacity of the edge device.
According to the scheme provided by the embodiment of the invention, after the server receives the video acquisition request sent by each edge device according to the set sending mode in each distribution period, the server distributes the video to the edge device based on the preset distribution rule, so that each copy number of each video recorded in the video distribution list is distributed to each edge device in one distribution period, and the effective distribution of the video is realized. In addition, each edge device deletes the video stored in each distribution cycle and received before the preset number of distribution cycles, namely, each edge device deletes the video according to the first-in first-out principle, so that all the copies of some videos can be deleted by the deletion operation of each edge device in each distribution cycle, and each video stored in the video distribution system is the video with the total copy number capable of meeting the playing requirement of a user. Therefore, the scheme can effectively distribute the video and ensure that the video in the video distribution system always belongs to the video meeting the playing requirement of the user.
Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a flowchart of a video distribution method according to an embodiment of the present invention;
fig. 2 is a structural diagram of a video distribution system according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Currently, in a video distribution system, when a video is deleted, a server periodically makes a decision whether to delete the video according to a ratio of the number of playing copies to the number of copying copies of the video. Wherein, for a video, the copy number refers to: the total number of the video stored in each edge device at present is as follows: among the number of copies of the video, the number of copies requested to be played by the user at the current time. Although the server gives the decision whether to delete each video, in a particular application, each edge device will determine whether to respond to the decision given by the server based on its own video requirements. Specifically, each edge device sets a priority for each video according to the number of times that each video is played within a period of time. If a video has a higher priority in the edge device, the edge device does not delete the video even if the server gives a decision to delete the video. Therefore, videos deleted by each edge device may be inconsistent, so that videos with the stored number of copies not reaching the predetermined number of copies exist in the video distribution system, and the playing requirement of the user cannot be met.
In order to solve the above problems in the prior art, embodiments of the present invention provide a video distribution method and system.
It should be noted that the distribution method provided by the embodiment of the present invention may be applied to a video distribution system. The video distribution system includes: a server and a plurality of edge devices. The server is a server for distributing videos to each edge device, and each edge device is a device for providing videos to users in response to play requests of the users. In a specific application, edge devices can be arranged in different regions, so that the edge devices in each region respond to the playing request of users in the region. For example, 1 ten thousand edge devices may be provided in Liaoning province, and 1 ten thousand edge devices may be provided in Jilin province.
In the embodiment of the present invention, the server stores a video distribution list. The video distribution list records each video to be distributed and a predetermined number of copies of each video, and specifically, the video distribution list correspondingly stores a video identifier of each video to be distributed and a predetermined number of copies of each video. Wherein, each video as the distribution object can be predetermined by an internet service provider, such as a video website. Specifically, the video may be news video, television drama, advertisement video, or the like. The predetermined number of copies is a number of copies set to meet the user's play requirement. It is understood that for a video, there may be a plurality of users requesting to play the video at the same time, and then, in order to meet the playing requirements of the users, a predetermined number of copies of the video may be stored in each edge device. The predetermined number of copies may be set empirically or as needed, and different predetermined numbers of copies may be set for different videos. For example, the predetermined number of copies is set to 1000 for popular dramas and 500 for news videos.
As shown in fig. 1, a video distribution method provided in an embodiment of the present invention may include the following steps:
s101, when each edge device enters each distribution period, sending a video acquisition request to a server according to a set sending mode; after receiving the video distributed by the server according to the video acquisition request, storing the received video; and deleting the video received before the preset number of distribution cycles when the deletion opportunity is detected to be met.
In a video distribution system, it is generally desirable to store as much video as possible in each edge device in order to make full use of the edge devices to provide video to users. Assuming that there are N edge devices, the maximum storage capacity of each edge device is SiEach video having a size of M, then, theoretically, the N videosThe total number of videos that an edge device can store is V, where V is S/M, where S is the total maximum storage capacity of the N edge devices,
in practical applications, in consideration of the download capability of each edge device and the playing weakening period of the video, V videos may be distributed to each edge device in a plurality of distribution periods, that is, the videos may be periodically distributed. The duration of a dispensing cycle can be set by itself. For example, the duration of one distribution cycle is set to one day. In the following examples, the duration of one distribution cycle is taken as one day.
Upon entering each distribution cycle, each edge device may send a video acquisition request to the server to cause the server to distribute video to the edge device for the video acquisition request. The specific form of the video acquisition request may be: HTTP (HyperText Transfer Protocol) request.
In this embodiment, each edge device may send a video acquisition request to the server according to a set sending manner when entering each distribution cycle. In a specific application, the set transmission mode may be various, and exemplarily, two cases are given below.
In the first case, the set transmission method is: when entering each distribution period, each edge device sends a video acquisition request to the server once, and then the server distributes videos to the edge device according to the video acquisition request. In this case, the time at which each edge device sends the video acquisition request to the server may be random. For example, edge device 1 may send a video fetch request to the server at 7 am of the day, and edge device 2 may send a video fetch request to the server at 12 pm of the day.
In the second case, each edge device periodically sends a plurality of video acquisition requests to the server upon entering each distribution cycle, and the server distributes a portion of the video to the edge device for each video acquisition request. Moreover, each video acquisition request may include: a first number of videos that the edge device has currently received. In this way, the server may determine how much video to send to the edge device for each video request based on the first number. For example, each edge device may send a video fetch request to the server every 1.5 hours a day. Because each edge device requests the video from the server for a plurality of times in one day, the edge device does not occupy too much bandwidth resource and computing resource when requesting the video each time, and therefore the edge device is not influenced to respond to the playing request of the user, namely the edge device is not influenced to provide the video for the user. In addition, different edge devices may request videos from the server at different times of the day. For example, edge device 1 may request video from the server at 8:30, 9:30 of the day, and edge device 2 may request video from the server at 8:30, 9:30 of the day.
Each edge device may save the received video after receiving the video distributed by the server for the video acquisition request. In this way, when the user requests the video from the edge device, the edge device can directly send the video stored locally to the user's play terminal. Therefore, the speed of acquiring the video by the user is high, and the user can obtain better experience.
It can be understood that, in order to meet the changing demand of the user for the video, the video distribution list is updated, at this time, the video recorded after the video distribution list is updated needs to be distributed to each edge device, and at this time, the video in each edge device is updated. Due to the limited storage space of the edge device, deletion of the video in the edge device is involved in the process of video distribution in order to update the video in the edge device. In this embodiment, when the edge device enters each distribution cycle and detects that the deletion timing is satisfied, videos received before a preset number of distribution cycles may be deleted. It will be appreciated that by updating the video in the edge device, P2P (Person-to-Person) traffic between the edge device and the user's cast terminal may be improved.
In order to facilitate that each edge device can store the video distributed by the server in one distribution period, corresponding to the first situation that each edge device sends the video acquisition request to the server according to the set sending manner, each edge device may delete the video received before a preset number of distribution periods once or delete the video for multiple times before sending the video acquisition request to the server. Also, in response to the second situation described above in which each edge device sends a video acquisition request to the server according to the set sending manner, each edge device may delete the video received before the preset number of distribution cycles at a time before sending the video acquisition request to the server for the first time. Whether the deletion is performed once or multiple times, the time point of the deletion can be set.
In addition, corresponding to the second situation that each edge device sends a video acquisition request to the server according to the set sending method, each edge device may also delete videos at certain time intervals within one distribution period. For example, each edge device may delete a video every 1 hour of the day. Moreover, the time when each edge device sends a video acquisition request to the server and the time when the edge device deletes the video may be set at different time points within one distribution cycle. In this way, too much computing resources of the edge device may not be occupied intensively over a period of time. For example, the edge device sends video acquisition requests to the server at intervals of 2, 4, 6, etc. points in the day, and deletes videos at intervals of 1, 3, 5, etc. points in the day. During each deletion, the number of videos deleted may be determined according to the time interval for deleting the videos and the number of videos received before a preset number of distribution cycles. For example, if the number of videos received before a preset number of distribution cycles is 1200 and the time interval for deleting videos is 2 hours, the number of videos to be deleted may be 100 during each deletion of a day.
Based on the above situation, the deletion timing may be: the point in time for each deletion of the video is reached. That is, each edge device can delete video received before a preset number of distribution cycles when detecting that the time point of deleting video arrives, upon entering each distribution cycle, accordingly.
In addition, the preset number can be set according to a specific application scene. For example: the preset number may be 2, 3, 4, etc. In addition, a preset number of distribution cycles may be preceded by: taking the currently entered distribution cycle as a first cycle before presetting a number of distribution cycles; or, it is reasonable to use the last cycle of the currently entered distribution cycle as the first cycle before a preset number of distribution cycles.
S102, the server determines the target number of videos to be distributed to each edge device according to the received video acquisition request sent by each edge device, and when the data volume of the target number of videos is judged to be not larger than the current available capacity of the edge device, different target number of videos are selected from the video distribution list based on a preset distribution rule, and the selected videos are distributed to the edge device.
The target number is determined based on the set sending mode, the maximum storage capacity of the edge device, the preset number of distribution cycles that the video can be reserved, and the size of each video in the video distribution list.
The preset distribution rule is as follows: and distributing the respective copies of each video recorded by the video distribution list to different edge devices in one distribution period.
In the video distribution system, after the server receives the video acquisition request sent by each edge device, the target number of videos to be distributed to the edge device can be determined. The reason for determining the target number is that: the server needs to consider the downloading capability of each edge device and the playing weakening period of the video, divide the total number of the videos which can be theoretically stored by the N edge devices into a plurality of distribution periods and distribute the videos to each edge device, and meanwhile, the maximum storage capacity of each edge device may be different. Therefore, when the server enters each distribution cycle, after receiving the video acquisition request sent by each edge device, the server needs to determine, for each edge device, the target number of videos to be distributed to the edge device for each video acquisition request.
Specifically, the manner in which the server determines the number of targets is related to the manner in which the edge device sends the video acquisition request to the server.
In a first manner of determination: corresponding to the first case in which the edge device in S101 sends a video acquisition request to the server in the set sending manner, the server determines the target number of videos to be distributed to the edge device, and may include the following steps a1-a 2:
step a1, calculating the total number of videos that the server expects to distribute to the edge device in the distribution cycle based on the maximum storage capacity of the edge device, the preset number of distribution cycles that the videos can be reserved, and the size of each video recorded by the video distribution list;
step A2, determining the total number calculated as: a target number of videos to be distributed to the edge device.
For a situation that the edge device sends a video acquisition request to the server once in the distribution period, after receiving the video acquisition request, the server may first calculate the total number of videos expected to be distributed to the edge device in the distribution period, and then use the total number as a target number of videos to be distributed to the edge device.
In this embodiment, the server may calculate the total number of videos expected to be distributed to the edge device during the distribution period using the following formula:
Vi＝Siv (T.times.M), where ViIs the total amount, SiDenotes the maximum storage capacity of the edge device, T denotes the number of distribution cycles that a preset video can be reserved, and M denotes the size of each video recorded by the video distribution list.
The preset number of distribution cycles T for which the video can be reserved is represented as: for each video, the set maximum length of time that the video can be stored on the respective edge device. T may be set by the server. For example, T is set to 5 days or 10 days. It is understood that the preset number in S101 does not exceed T.
Alternatively, in order to fully utilize the storage space of the edge device, the preset number in S101 may be the same as the preset number T of distribution cycles that the video can be reserved. In this case, the server needs to distribute V videos to each edge device in a plurality of distribution cycles, and the total number of cycles of the plurality of distribution cycles set by the server is substantially the duration of each video stored on the corresponding edge device, i.e. the number of distribution cycles that the preset video can be stored. Specifically, if the total number of the plurality of distribution cycles set by the server is T1Then, the server needs to distribute V/T to N edge devices in total in each distribution cycle1A video. Specifically, in the 1 st to the T th1Distributing V/T evenly in one distribution period1A video, then, the server passes the front T1Video distribution for a number of distribution cycles, such that a total of V videos are stored on the N edge devices. At the T th1In +1 distribution period, each edge device deletes the video received in the 1 st distribution period, and the server still distributes the V/T to the N edge devices1A video. Then, for a video, after the video is distributed to a certain edge device, the time duration for the video to be stored on the edge device is T1. Therefore, the total number of the plurality of delivery cycles set by the server is T1The number of distribution cycles T is the same as the preset number of video retainable distribution cycles T.
In the above formula, the maximum storage capacity for each edge device is SiAnd the preset number of distribution cycles for which the video can be reserved is T, then the total size of the video that the server needs to distribute to the edge device in one distribution cycle is: siand/T. Since each video has a size of M, the total number of videos that the server expects to distribute to the edge device in one distribution cycle is: si/(T×M)。
For example, the capacity of the edge device 1 is 100G, the preset number of distribution cycles T that the video can be reserved is 5 days, and the size of each video is 0.1G, then the total number of videos that the server expects to distribute to the edge device 1 in one distribution cycle is: 200 pieces.
In a second manner of determination: corresponding to the first case in which the edge device in S101 sends the video acquisition request to the server in the set sending manner, the server determines the target number of videos to be distributed to the edge device, and may include the following steps B1-B2:
step B1, if a video acquisition request sent by the edge device is received for the first time, calculating the total number of videos that the server expects to distribute to the edge device in the distribution period based on the maximum storage capacity of the edge device, the preset number of distribution cycles that the videos can be reserved, and the size of each video recorded in the video distribution list; determining any one of no more than the total number as: a target number of videos to be distributed to the edge device;
step B2, if the video acquisition request sent by the edge device is not received for the first time and not received for the last time, calculating the difference between the total number and the first number; if the difference is greater than zero, any one of the quantities not exceeding the difference and greater than zero is determined as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, not distributing the video to the edge device;
step B3, if the video acquisition request sent by the edge device is received for the last time, calculating the difference between the total number and the first number; if the difference is greater than zero, determining the difference as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, no video is distributed to the edge device.
For a situation that the edge device sends a video acquisition request to the server multiple times in the distribution period, after the server receives the video acquisition request sent by the edge device for the first time, the server may first calculate the total number of videos expected to be distributed to the edge device in the distribution period, and then use any number that does not exceed the total number as a target number of videos to be distributed to the edge device. For example, the total number is: for the first video acquisition request, the target number may be determined as: 20. that is, for the first video acquisition request, the server distributes 20 different videos to the edge device.
If the server receives the video acquisition request sent by the edge device not for the first time and not for the last time, the difference between the total number and the first number included in the video acquisition request can be calculated, that is, how many videos need to be distributed to the edge device in the distribution period is calculated. After the difference is calculated, if the difference is greater than zero, any one of the numbers not exceeding the difference and greater than zero can be used as the target number of videos to be distributed to the edge device. For example, the calculated difference is 80, and for the second video acquisition request, the target number may be determined as: 30. that is, for the first video acquisition request, the server distributes 30 different videos to the edge device. Specifically, when calculating the difference, the server may first read the first number in the video acquisition request, and then calculate the difference between the total number and the read first number. Of course, if the difference is zero, it indicates that the server has distributed the total number of videos expected to be distributed to the edge device during the distribution period, and the server may no longer distribute videos to the edge device. In other cases, edge devices may appear for various reasons: in the case that the counted first number exceeds the total number, the difference is less than zero. For this case, the server may not distribute the video to the edge device.
If the server receives the video acquisition request sent by the edge device for the last time, the server may calculate a difference between the total number and the first number included in the video acquisition request for the last time, that is, calculate how many videos need to be distributed to the edge device in the distribution period. After the difference is calculated, if the difference is greater than zero, the difference can be taken as the target number of videos to be distributed to the edge device. For example, the calculated difference is 10, and for the last video acquisition request, the target number may be determined as: 10. that is, for the last video acquisition request, the server distributes all the videos that need to be distributed to the edge device in the distribution period to the edge device. Similarly, when calculating the difference, the server may first read the first number in the video acquisition request, and then calculate the difference between the total number and the read first number. Of course, if the difference is zero, it indicates that the server has distributed the total number of videos expected to be distributed to the edge device during the distribution period, and the server may no longer distribute videos to the edge device. In other cases, edge devices may appear for various reasons: in the case that the counted first number exceeds the total number, the difference is less than zero. For this case, the server may not distribute the video to the edge device.
No matter the edge device sends a video acquisition request once in a distribution period or sends video acquisition requests for multiple times, the server can further judge whether the data volume of the target number of videos is not greater than the current available capacity of the edge device or not according to the video acquisition request received each time after determining the target number. If the current available capacity of the edge device is not larger than the preset distribution rule, the server selects a target number of different videos from the video distribution list and distributes the video data of the selected videos to the edge device, wherein the target number of different videos is enough to be stored in the data amount of the target number of videos.
Specifically, each edge device may carry some parameters, such as the maximum storage capacity S of the edge device, in the video acquisition request sent to the serveriAnd used capacity Ci. The server may calculate the current available capacity of the edge device based on the parameters, and further determine whether the data amount of the target number of videos is not greater than the current available capacity of the edge device.
In this embodiment, the significance of the server selecting a target number of different videos from the video distribution list is as follows: for each edge device, a different video is distributed to the edge device within one distribution cycle. I.e. such that the same video is not stored repeatedly on each edge device. Therefore, the problem that the edge device is subjected to more bandwidth pressure because a plurality of users acquire the same video from the same edge device at the same time can be avoided.
Moreover, in this embodiment, the server needs to select a video for each edge device based on the preset distribution rule. Specifically, in the preset distribution rule, the number of copies of each video in the video distribution list needs to be distributed to different edge devices in one distribution cycle. That is, each copy of each video is not distributed to different edge devices in 2 or more distribution cycles, but is distributed within the same distribution cycle. Based on the distribution rule, each edge device deletes the video received before the preset number of cycles when entering each distribution cycle, so that for one video, each copy number of the video is distributed to different edge devices in a certain distribution cycle, and the corresponding edge device deletes the video after the preset number of cycles. In this way, for each video, when the video is stored in the respective edge devices of the video distribution system, the stored number of copies of the video is always the predetermined number of copies in the video distribution list. That is to say, the storage number of the video is always sufficient, and the playing requirement of the user can be met.
It should be noted that the predetermined number of copies per video is often much smaller than the number of edge devices in the video distribution system. For example, the number of edge devices is 200 ten thousand, and the predetermined number of copies per video is 2000. Each edge device requests videos from the server in each distribution period, so that distribution completion of each copy of each video in one distribution period can be guaranteed. Specifically, for a situation that the edge device requests the server for a video for multiple times in a distribution cycle, the distribution of each copy of each video is completed in one request process of each device. For example, each edge device sends a video acquisition request to the server between 8 o 'clock and 9 o' clock in the day, and then the server distributes the video, and distributes all the copies of the video a recorded in the list during the process of the request.
Specifically, in the process of selecting the video, the server may select the video in the video distribution list in the order from first to last. Further, after a target number of different videos are selected and distributed to the edge device, the number of copies of the selected video in the video distribution list may be updated based on the selected video. The specific updating is as follows: the number of selected video copies is reduced by 1. For example, the video distribution list records, from beginning to end: video 1, 100, video 2, 100, video 3, 100. When the edge device 1 requests a video, the server selects 1 part of video 1 and 1 part of video 2 to distribute to the edge device 1, and subtracts 1 part of video 1 and video 2 to obtain 99 parts of video. When the edge device n requests a video, if the number of the video 1 is 0, the server selects 1 video 2 and 1 video 3 to distribute to the edge device n. That is, if the number of copies of one video is 0, the next video is selected.
Optionally, when the server determines that the data amount of the target number of videos is greater than the current available capacity of the edge device, it indicates that the current available capacity of the edge device is not enough to store the data amount of the target number of videos, and then the server may feed back a message indicating that the video acquisition request fails to the edge device. For example, the server may feed back an empty message to the edge device, i.e., the server does not distribute video to the edge device.
According to the scheme provided by the embodiment of the invention, after the server receives the video acquisition request sent by each edge device according to the set sending mode in each distribution period, the server distributes the video to the edge device based on the preset distribution rule, so that each copy number of each video recorded in the video distribution list is distributed to each edge device in one distribution period, and the effective distribution of the video is realized. In addition, each edge device deletes the video stored in each distribution cycle and received before the preset number of distribution cycles, namely, each edge device deletes the video according to the first-in first-out principle, so that all the copies of some videos can be deleted by the deletion operation of each edge device in each distribution cycle, and each video stored in the video distribution system is the video with the total copy number capable of meeting the playing requirement of a user. Therefore, the scheme can effectively distribute the video and ensure that the video in the video distribution system always belongs to the video meeting the playing requirement of the user.
Corresponding to the embodiment of the method shown in fig. 1, an embodiment of the present invention further provides a video distribution system, as shown in fig. 2, the video distribution system includes a server 202 and a plurality of edge devices 201, and a video distribution list is stored in the server 202.
Each edge device 201 is configured to send a video acquisition request to the server 202 according to a set sending method when entering each distribution cycle; after receiving the video distributed by the server 202 for the video acquisition request, saving the received video; when the deletion opportunity is met, deleting the videos received before a preset number of distribution cycles;
the server 202 is configured to determine, for each received video acquisition request sent by the edge device 201, a target number of videos to be distributed to the edge device 201, select, based on a preset distribution rule, different videos of the target number from videos recorded in the video distribution list when it is determined that the data amount of the videos of the target number is not greater than the current available capacity of the edge device 201, and distribute the selected videos to the edge device 201;
wherein the target number is determined based on the set sending mode, the maximum storage capacity of the edge device 201, a preset number of distribution cycles that the video can be reserved, and the size of each video recorded by the video distribution list;
wherein, the preset distribution rule is as follows: the respective copies of each video recorded by the video distribution list are distributed to different edge devices 201 in one distribution cycle.
According to the scheme provided by the embodiment of the invention, after the server receives the video acquisition request sent by each edge device according to the set sending mode in each distribution period, the server distributes the video to the edge device based on the preset distribution rule, so that each copy number of each video recorded in the video distribution list is distributed to each edge device in one distribution period, and the effective distribution of the video is realized. In addition, each edge device deletes the video stored in each distribution cycle and received before the preset number of distribution cycles, namely, each edge device deletes the video according to the first-in first-out principle, so that all the copies of some videos can be deleted by the deletion operation of each edge device in each distribution cycle, and each video stored in the video distribution system is the video with the total copy number capable of meeting the playing requirement of a user. Therefore, the scheme can effectively distribute the video and ensure that the video in the video distribution system always belongs to the video meeting the playing requirement of the user.
Optionally, the preset number is the same as the preset number of distribution cycles that the video can be retained.
Optionally, the set sending method is: in the distribution period, the edge device 201 sends a video acquisition request to the server 202;
the server 202 is specifically configured to calculate, based on the maximum storage capacity of the edge device 201, a preset number of distribution cycles that the video can be reserved, and a size of each video recorded in the video distribution list, a total number of videos that the server 202 expects to be distributed to the edge device 201 in the distribution cycle; determining the total number calculated as: the target number of videos to be distributed to the edge device 201.
Optionally, the set sending method is: during the distribution period, the edge device 201 periodically sends a plurality of video acquisition requests to the server 202; each video acquisition request comprises: a first number of videos that the edge device 201 has currently received;
the server 202 is specifically configured to, if a video acquisition request sent by the edge device 201 is received for the first time, calculate, based on the maximum storage capacity of the edge device 201, a preset number of distribution cycles that a video can be reserved, and a size of each video recorded in the video distribution list, a total number of videos that the server 202 expects to be distributed to the edge device 201 in the distribution cycle; determining any number not exceeding the total number as: the target number of videos to be distributed to the edge device 201;
if the video acquisition request sent by the edge device 201 is not received for the first time and not received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining any one of the quantities not exceeding the difference and greater than zero as: the target number of videos to be distributed to the edge device 201; if the difference is not greater than zero, no video is distributed to the edge device 201;
if a video acquisition request sent by the edge device 201 is received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining the difference as: the target number of videos to be distributed to the edge device 201; if the difference is not greater than zero, no video is distributed to the edge device 201
Optionally, the formula for calculating the total number is:
Vi＝Siv (T.times.M), where ViTo said total number, SiDenotes the maximum storage capacity of the edge device 201, T denotes the number of distribution cycles that a preset video can be reserved, and M denotes the size of each video recorded by the video distribution list.
Optionally, the server 202 is further configured to update the number of copies of the selected video in the video distribution list based on the selected video after distributing the selected video to the edge device 201.
Optionally, the server 202 is further configured to feed back, to the edge device 201, a message indicating that the video acquisition request fails when it is determined that the data amount of the target number of videos is greater than the current available capacity of the edge device 201.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (14)
1. A video distribution method applied to a video distribution system, the video distribution system comprising: the system comprises a server and a plurality of edge devices, wherein a video distribution list is stored in the server; the method comprises the following steps:
each edge device sends a video acquisition request to the server according to a set sending mode when entering each distribution period; after receiving the video distributed by the server aiming at the video acquisition request, saving the received video; when the deletion opportunity is met, deleting the videos received before a preset number of distribution cycles;
the server determines the target number of videos to be distributed to each edge device according to the received video acquisition request sent by each edge device, and when the data volume of the videos with the target number is judged to be not larger than the current available capacity of the edge device, the server selects different videos with the target number from the videos recorded in the video distribution list based on a preset distribution rule and distributes the selected videos to the edge device;
the target number is determined based on the maximum storage capacity of the edge device, a preset number of distribution cycles that videos can be reserved, and the size of each video recorded by the video distribution list, and after the server predicts the total number of videos distributed to the edge device, the server determines the total number and the set transmission mode;
wherein, the preset distribution rule is as follows: and distributing the respective copies of each video recorded by the video distribution list to different edge devices in one distribution period.
2. The method of claim 1, wherein the predetermined number is the same as the predetermined number of video retainable distribution cycles.
3. The method according to claim 1, wherein the set transmission mode is: in the distribution period, the edge device sends a video acquisition request to the server;
the determining the target number of videos to be distributed to the edge device includes:
calculating the total number of videos which are expected to be distributed to the edge device by the server in the distribution period based on the maximum storage capacity of the edge device, the preset number of distribution periods in which the videos can be reserved and the size of each video recorded by the video distribution list;
determining the total number calculated as: a target number of videos to be distributed to the edge device.
4. The method according to claim 1, wherein the set transmission mode is: in the distribution period, the edge device periodically sends a plurality of video acquisition requests to the server; each video acquisition request comprises: a first number of videos that the edge device has currently received;
the determining the target number of videos to be distributed to the edge device includes:
if a video acquisition request sent by the edge device is received for the first time, calculating the total number of videos to be distributed to the edge device in the distribution period based on the maximum storage capacity of the edge device, the preset number of distribution periods in which the videos can be reserved and the size of each video recorded in the video distribution list; determining any number not exceeding the total number as: a target number of videos to be distributed to the edge device;
if the video acquisition request sent by the edge device is not received for the first time and not received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining any one of the quantities not exceeding the difference and greater than zero as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, not distributing the video to the edge device;
if a video acquisition request sent by the edge device is received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining the difference as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, no video is distributed to the edge device.
5. The method according to claim 3 or 4, characterized in that the formula for calculating the total number is:
Vi＝Siv (T.times.M), where ViTo said total number, SiRepresents the maximum storage capacity of the edge device, T represents the preset number of distribution cycles that the video can be reserved, and M represents the size of each video recorded by the video distribution list.
6. The method of claim 1, further comprising:
and after the server distributes the selected video to the edge device, updating the number of the selected video in the video distribution list based on the selected video.
7. The method of claim 1, further comprising:
and when judging that the data volume of the target number of videos is larger than the current available capacity of the edge device, the server feeds back a message representing the failure of the video acquisition request to the edge device.
8. A video distribution system, comprising: the system comprises a server and a plurality of edge devices, wherein a video distribution list is stored in the server;
each edge device is used for sending a video acquisition request to the server according to a set sending mode when entering each distribution period; after receiving the video distributed by the server aiming at the video acquisition request, saving the received video; when the deletion opportunity is met, deleting the videos received before a preset number of distribution cycles;
the server is used for determining the target number of videos to be distributed to each edge device according to the received video acquisition request sent by each edge device, and when the data volume of the videos with the target number is judged to be not larger than the current available capacity of the edge device, selecting different videos with the target number from the videos recorded in the video distribution list based on a preset distribution rule, and distributing the selected videos to the edge device;
the target number is determined based on the maximum storage capacity of the edge device, a preset number of distribution cycles that videos can be reserved, and the size of each video recorded by the video distribution list, and after the server predicts the total number of videos distributed to the edge device, the server determines the total number and the set transmission mode;
wherein, the preset distribution rule is as follows: and distributing the respective copies of each video recorded by the video distribution list to different edge devices in one distribution period.
9. The system of claim 8, wherein the predetermined number is the same as the predetermined number of video retainable distribution cycles.
10. The system according to claim 8, wherein the set transmission mode is: in the distribution period, the edge device sends a video acquisition request to the server;
the server is specifically configured to calculate, based on the maximum storage capacity of the edge device, a preset number of distribution cycles that videos can be reserved, and a size of each video recorded in the video distribution list, a total number of videos that the server expects to be distributed to the edge device in the distribution cycle; determining the total number calculated as: a target number of videos to be distributed to the edge device.
11. The system according to claim 8, wherein the set transmission mode is: in the distribution period, the edge device periodically sends a plurality of video acquisition requests to the server; each video acquisition request comprises: a first number of videos that the edge device has currently received;
the server is specifically configured to, if a video acquisition request sent by the edge device is received for the first time, calculate, based on the maximum storage capacity of the edge device, a preset number of distribution cycles that the video can be reserved, and a size of each video recorded in the video distribution list, a total number of videos that the server expects to be distributed to the edge device in the distribution cycle; determining any number not exceeding the total number as: a target number of videos to be distributed to the edge device;
if the video acquisition request sent by the edge device is not received for the first time and not received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining any one of the quantities not exceeding the difference and greater than zero as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, not distributing the video to the edge device;
if a video acquisition request sent by the edge device is received for the last time, calculating a difference value between the total number and the first number; if the difference is greater than zero, determining the difference as: a target number of videos to be distributed to the edge device; if the difference is not greater than zero, no video is distributed to the edge device.
12. The system of claim 10 or 11, wherein the formula for calculating the total number is:
Vi＝Siv (T.times.M), where ViTo said total number, SiRepresents the maximum storage capacity of the edge device, T represents the preset number of distribution cycles that the video can be reserved, and M represents the size of each video recorded by the video distribution list.
13. The system of claim 8,
and the server is further configured to update the number of the selected videos in the video distribution list based on the selected videos after distributing the selected videos to the edge device.
14. The system of claim 8,
and the server is further used for feeding back a message representing that the video acquisition request fails to the edge device when the data volume of the target number of videos is judged to be larger than the current available capacity of the edge device.
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| CN110677684B (en) * | 2019-09-30 | 2022-06-03 | 北京奇艺世纪科技有限公司 | Video processing method, video access method, distributed storage method and distributed video access system |
| CN110620828A (en) * | 2019-10-31 | 2019-12-27 | 北京奇艺世纪科技有限公司 | File pushing method, system, device, electronic equipment and medium |
| CN112985823B (en) * | 2021-03-01 | 2023-12-05 | 英博超算(南京)科技有限公司 | Testing device for simulating camera sensor |
| CN114222001B (en) * | 2021-12-06 | 2024-03-15 | 北京百度网讯科技有限公司 | Edge device, edge device method, edge device system, electronic device and storage medium |
| CN114928752B (en) * | 2022-05-13 | 2023-08-18 | 中国广电广州网络股份有限公司 | Dynamic adjusting method for video on demand program |
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