CN106454396A - Method for improving concurrency of live broadcast time shifted TV - Google Patents
Method for improving concurrency of live broadcast time shifted TV Download PDFInfo
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- CN106454396A CN106454396A CN201610945223.4A CN201610945223A CN106454396A CN 106454396 A CN106454396 A CN 106454396A CN 201610945223 A CN201610945223 A CN 201610945223A CN 106454396 A CN106454396 A CN 106454396A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23113—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving housekeeping operations for stored content, e.g. prioritizing content for deletion because of storage space restrictions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/2312—Data placement on disk arrays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
Abstract
The invention provides a method for improving the concurrency of a live broadcast time shifted TV, and relates to concurrent technology of time shifted TVs. The method provided by the invention comprises an internal memory partition system, file synchronization software, file expiration management and file request heat analysis; on the respect of live broadcast time shifted video slice file distribution, popular channels and video slices thereof should be stored in a content partition as many as possible, and unpopular channels and the video slices thereof should not occupy excessive internal memory. The time shifted lengths of different channels in the internal memory partitions are dynamically adjusted according to the popularity of the channels, therefore the utilization rate of the internal memory partitions can be further improved, the reading pressure of a magnetic disk is reduced, and the publish concurrency of live broadcast time shifted video contents is effectively improved.
Description
Technical field
The present invention relates to the concurrent technology of time-moving television, more particularly, to a kind of realization improving direct broadcast time-shift TV concurrent capability
Method.
Background technology
Popular with two-way IP direct broadcast time-shift TV, its viewer amount is increasing, improves separate unit video stream pushing clothes
The work of the concurrent capability of business device seems increasingly important.
In video stream pushing server, limit the concurrent bottleneck of plug-flow and be typically the network bandwidth and magnetic disc i/o.Current network
Equipment using multiple PCI-Express bindings, or would generally be introduced directly into ten thousand Broadcoms, and the network bandwidth is no longer bottleneck already.And
The random read-write speed of magnetic disc i/o equipment is it will usually be significantly lower than the network bandwidth, thus becoming restriction video stream pushing server simultaneously
The basic bottleneck of the ability of sending out.Even with the storage of expensive straight-through SSD hard disk array composition, its reading speed is also difficult to surpass
Cross the speed of ten thousand Broadcoms.Still more in direct broadcast time-shift TV stream pushing server, storage also can constantly write live in the moment
Video segment file (video flowing), stream pushing server be stored in constantly in a large number write data while, be also performed to random write
Take, its actual reading capability is had a greatly reduced quality.Therefore, for direct broadcast time-shift video server, improve the random write of its storage
Writing rate or mode, are only and improve the concurrent effective way of stream pushing server.
Content of the invention
For improving the concurrent capability of two-way direct broadcast time-shift TV, and the hardware cost of reduction stream pushing server, the present invention
Providing one kind and enter row cache Hot Contents using memory partitioning system, reducing disk read-write frequency, thus reducing server
The high performance demand to hard disk, and the method bringing the raising of server concurrent capability.
The effective way reducing disk reading pressure is exactly to be cached using internal memory as much as possible, and the present invention is from this
Point is set about it is proposed that a kind of implementation method improving direct broadcast time-shift TV concurrent capability, by a kind of method simply easily realized,
To complete caching on internal memory for the video content.
The video stream pushing server of direct broadcast time-shift TV, except the data when asking video content for the viewer to be considered
Read pressure, it is also contemplated that live video source is to the real-time write pressure of stream pushing server.Assume live TV stream by 100 channel groups
Become, averagely each channel be 5Mbps code check (because the self-adaption code rate of various code rate may be comprised, and HDTV content,
To estimate by higher code check situation herein), it will 500Mbps is formed to server storage, that is, the write of 62.5MB/s
Pressure.If using traditional SATA storage, only file write just occupies huge expense.
For above-mentioned 100 road channels, the example of every channel 5Mbps, press the stream pushing server 16G internal memory of middle-end configuration at present
Consider, the time-moving television content of about 4.3 minutes (16000MB ÷ 62.5MB/s ÷ 60 second/minute=8.5 minute) can be preserved.
The time shift of 4.3 minutes obviously can not meet the common requirements of time-moving television, and it is little that modern time-moving television generally will meet 30 minutes～4
When time shift demand.To calculate according to maximum 4 hours, (4 is little to preserve these television contents to take around the storage of 900GB
When × 3600 seconds/hour × 62.5MB/s=900000MB).These contents can be hard using higher SSD or SAS of readwrite performance
Disk forms Raid to realize.The relatively low SATA hard disc of use cost can also form the bigger memory space of capacity, to preserve
More channels, more long time-shifted contents or higher video code rate.
In order to improve the utilization rate of memory storage subregion in addition it is also necessary to the temperature of analysis channel program, dynamically to adjust each
The duration that channel retains in memory partitioning.For example, relatively more popular CCTV and satellite TV channel are it should retain in memory partitioning
Longer time-moving television duration, and the committed memory space that the channel of unexpected winner should be as few as possible, or even the channel of unexpected winner do not need
Internal memory retains, but is saved directly in hard disk.
For the distribution of content temperature, the channel hot topic analysis result that can be provided by audience statistical system is simple to do
Default adjustment.Dynamic analysis scheduler program can also be increased in stream pushing server, to determine the hot topic of each video segment
Degree and the life cycle retaining in internal memory.
The technical scheme is that：
A kind of implementation method improving direct broadcast time-shift TV concurrent capability,
Including memory partitioning system, file synchronization software, file expiration management and the analysis of file request temperature；Wherein,
First internal memory is divided into live and time shift memory partitioning in short-term, time shift fdisk when storage is divided into long；
After the subregion completing internal memory and hard disk divides, direct broadcast time-shift video server will be carried out with live central server
Docking, in real time from live source server pull or by live source server push live content, and is saved in live interior
Deposit in subregion；
Used here as file synchronization software, by the file real-time synchronization of memory partitioning in fdisk；And file is deleted
Can be using by timed task and script, when disk size exceedes specific threshold, by the section video file out of date for early stage
Batch is deleted.
In internal memory, the process of cache file is, video source file is stored in internal memory first, then unloading from internal memory
To in hard disk, popular piece rapid lapse of time in internal memory is retained, the fragment short time of unexpected winner retains simultaneously.Its process can be as far as possible
Ground reduces number of times and the possibility that hard disk reads.
When synchronous, only do increment synchronization, do not do deletion synchronous.File synchronization software include Windows SyncToy or
FreeFileSync, and the Inotify+Rsync of Linux.
The method optionally file can be retained in internal memory and caches according to file access temperature；
The video segment being cached in internal memory is to be preserved based on time inverted order；
Retain more popular file fragment in internal memory, the number that unexpected winner file fragment caches in internal memory can be reduced simultaneously
Amount；
Brief description
Fig. 1 is live stream pushing server deployment architecture and user's playing request overall schematic.
Specific embodiment
Below more detailed elaboration is carried out to present disclosure：
The hardware configuration of hypothesis stream pushing server is 32GB internal memory, 1TB stores (being only used for preserving time shift program), 10,000,000,000 nets
Card.First the 16GB in internal memory is divided into live and time shift memory partitioning in short-term, will storage 1TB time shift hard disk when being divided into long
Subregion.The RamDisk of common memory partitioning software such as Windows, and the TmpFS of Linux all can create memory partitioning
System.
After the subregion completing internal memory and hard disk divides, direct broadcast time-shift video server will be carried out with live central server
Docking, in real time from live source server pull (or by live source server push) live content, and is saved in live
In memory partitioning.Calculate according to the 5Mbps code check estimated above, in the case of 100 direct broadcast bands, stream pushing server interior
Deposit the live and time-shifted contents that subregion can preserve 4.3 minutes.For the time-shifted contents more than 4.3 minutes, then need to be saved in
In fdisk.
Used here as file synchronization program, by the file real-time synchronization of memory partitioning in fdisk.When synchronous, should
Note only doing increment synchronization, do not do deletion synchronous.SyncToy or FreeFileSync of file synchronization software such as Windows,
And the Inotify+Rsync of Linux.And file is deleted and can be used by timed task and script, when disk size is more than one
Determine during threshold values (such as 90%), the section video file batch out of date for early stage is deleted.
It is proposed that Nginx is used as HTTP server in terms of direct broadcast time-shift video segment file program request download.Use
Nginx issues the video segment file of the live/time shift in short-term of memory partitioning respectively, and the length of fdisk constantly video shift is cut
Piece file, as two HTTP service.By the live of all users and time shifting request, all live/time shifts in short-term of acquiescence guiding
Issue port, if user's request is time shift in live content, or short time, server will be directly from memory partitioning
Middle reading file, is not take up magnetic disc i/o.When user's request during time time-shifted contents earlier, cannot look in memory partitioning
To the file of early stage, therefore can trigger 404 error conditions, thus the request of user can be redirected in the time shift of fdisk
Hold.The following is Nginx to live and time shift concrete configuration method example.
In brief, for the content of 100 channel 5Mbps code checks above, for the live of user and 4.3 minutes with
Interior time shifting request, server, when providing the user HTTP download, does not interfere with magnetic disc i/o speed.Only when user's request ratio
During 4.3 minutes contents earlier, just can read file from disk.
In terms of direct broadcast time-shift video segment file distribution, popular channel and its video segment should be deposited as much as possible
In content partition, and unexpected winner channel and its section should not take excessive internal memory.Different frequencies are dynamically adjusted according to channel temperature
Road, in the time shift length of memory partitioning, can improve the utilization rate of memory partitioning further, and reduce the pressure of disk reading.
Claims (4)
1. a kind of improve direct broadcast time-shift TV concurrent capability implementation method it is characterised in that
Including memory partitioning system, file synchronization software, file expiration management and the analysis of file request temperature；Wherein,
First internal memory is divided into live and time shift memory partitioning in short-term, time shift fdisk when storage is divided into long；
Complete internal memory and hard disk subregion divide after, direct broadcast time-shift video server will with live central server carry out right
Connect, in real time from live source server pull or by live source server push live content, and be saved in live internal memory
In subregion；
Using file synchronization software, by the file real-time synchronization of memory partitioning in fdisk；And file is deleted to use and is led to
Cross timed task and script, when disk size exceedes specific threshold, the section video file batch out of date for early stage is deleted.
2. method according to claim 1 it is characterised in that in internal memory the process of cache file be, video source file
It is stored in first in internal memory, then dumps in hard disk from internal memory, popular piece rapid lapse of time in internal memory is retained simultaneously, cold
The fragment short time of door retains.
3. method according to claim 1, it is characterised in that when synchronous, only doing increment synchronization, does not do deletion synchronous.
4. method according to claim 3 it is characterised in that file synchronization software include Windows SyncToy or
FreeFileSync, and the Inotify+Rsync of Linux.
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| CN110582004A (en) * | 2018-06-07 | 2019-12-17 | 青岛海尔多媒体有限公司 | television system of hotel, video playing method and information sharing method |
| CN111372103A (en) * | 2018-12-26 | 2020-07-03 | 中兴通讯股份有限公司 | Multicast method, device, equipment and computer storage medium |
| CN112492341A (en) * | 2020-11-30 | 2021-03-12 | 深圳前海微众银行股份有限公司 | Live broadcast time shifting caching method, device and system and computer readable storage medium |
| CN112788352A (en) * | 2019-11-01 | 2021-05-11 | 海信电子科技（深圳）有限公司 | Live broadcast time shifting method, terminal and storage medium |
| CN112995268A (en) * | 2019-12-16 | 2021-06-18 | 现代自动车株式会社 | Method of managing memory of vehicle multimedia system, recording medium, and playback apparatus |
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Application publication date: 20170222 |