? Optimized use of the broadcast system
In today's broadcast system, the source of broadcast programs is more extensive. In addition to the traditional video recorder uploads, there are also programs directly transmitted from the downsizing network and the news network. In order to better integrate and integrate programs from various sources, broadcast The out-of-the-box system came into being. During the use of the broadcast maintenance system, we have increasingly realized that the traditional maintenance process has many problems such as excessive backup volume, low migration efficiency, and low utilization of storage space. In order to solve this series of problems, we have optimized the maintenance system and migration strategy services. Next, I will give a brief introduction on this.
First of all, please have a preliminary understanding of the maintenance system of our station through the following figure.
There are 4 upload servers in our whole system. Among them, upload 1 is for uploading, and upload 2 and upload 3 are for uploading of self-run programs. Upload 4 is for uploading and recording of home channels. The net is used for the production of TV series and the compilation and editing of live programs. All the programs are transferred to the secondary storage A for backup, and all the programs in the secondary storage A are copied to the secondary storage C for backup, and the advertisements are also copied to the secondary storage B and the secondary storage D. Make a backup. When the program needs to be broadcasted, it can be migrated from the secondary broadcast A to the broadcast server. The broadcast server is divided into a broadcast primary server, a broadcast standby server, and a broadcast third standby server.
The types of programs in our station are broadly divided into five categories: advertising, TV dramas, self-run programs, home economic programs, and gasket promotional videos. Next, I will introduce the storage mechanism of these five program types in our traditional maintenance system.
(1) Advertising: The advertisement is divided into two parts. The advertisement of the 1-4 channel is uploaded by the advertising department and stored permanently in the uploading 1 and secondary storage A, B, C and D; the other channel advertisements are uploaded by the own channel. Stored in upload 2 or upload 3 and secondary storage A, B, C, and D. All ads need to be manually deleted if they need to be cleaned up.
(2) TV series: According to the broadcast layout stored in the downsizing network and the secondary storage A and C, the backups in the secondary storage A and C are automatically cleaned according to the deletion policy, and the backup in the reduced network needs to be manually cleaned.
(3) Self-running program: stored in upload 2 or upload 3 and secondary storage A and C according to the broadcast schedule, and automatically cleaned according to the deletion policy.
(4) Home economic program: stored in upload 4 and secondary storage A and C, wherein the backup in upload 4 is automatically cleaned according to the deletion policy, and the backup in secondary storage A and C is retained for a long time. delete.
(5) Gasket promo: Stored in upload 2 or upload 3 and secondary storage A and C for a long time. If you need to clean it, you need to delete it manually.
In addition to the backup system, advertisements and tile trailers are also stored in the broadcast server for a long time. Among them, the 1-4 channel advertisements in the advertisement type are large, so the storage server also has a large storage pressure.
Through the above introduction, it is not difficult to find that various types of programs have multiple backup storage problems, resulting in low storage space utilization and cumbersome backup strategies. The storage space is insufficient, especially in secondary storage A and C. And because all the materials moved to the broadcast server are secondary storage A as a migration source, resulting in low migration bandwidth utilization and insufficient migration tasks (all migration tasks to the broadcast server and to secondary storage) The tasks of B and C are secondary storage A as a copy source, so the bandwidth of the secondary storage A and the number of parallel tasks become the bottleneck). In order to solve these problems, we re-planned the backup mechanism of the whole system and optimized the migration policy service.
As shown in the figure, the migration policy service includes four categories: copy policy, delete copy policy, delete material policy, and automatic technical review strategy. Among them, there are a copy policy and a delete copy policy related to the optimization of the whole system (the following two figures are the case of copying the policy after the optimization is completed and deleting the copy policy).
Next, I will introduce the specific implementation steps of this system optimization:
1. Clear advertisements and tile trailers that will not be broadcasted in a short period of time from the broadcast server, reducing the storage pressure on the broadcast server. In the "delete copy strategy", add the "Delete unused shim promo" and "Delete 1/2/3/4 channel playout server temporarily unused creatives" two strategies, the following picture is the newly added "Delete" The strategy of not using the shim" policy needs to be configured accordingly (the configuration is described in detail here, and the similar configuration will not be described later): the program type is selected as the shim trailer, that is, the deleted program type is limited to the pad. Movies; all the broadcast servers are selected in the source storage option, that is, the tile trailers in all the broadcast servers can be deleted; the deletion range is set to 3 days, that is, the last time the program list is broadcasted. After the day and the new program list is not added to the material, the material is deleted from the broadcast server; all channels are selected by the channel, that is, the tile trailers belonging to all channels can be deleted.
2. The advertisement has up to five backups in the whole system. The TV drama takes up huge storage space and has backup in the downsizing network. Therefore, it is decided that the advertisement and TV drama are no longer stored in the secondary storage C, and the storage pressure of the secondary storage C is alleviated. . First add "temporary deletion of secondary C advertising TV drama" in the "delete copy strategy" to clear all the commercial TV dramas stored in secondary storage C; then in the "copy strategy" to "secondary A to secondary The C" policy is modified to cancel the TV show and all advertisements in the program type option so that the advertisements and TV shows are no longer copied to the secondary storage C, as shown in the following figure.
3. There are two sources of home economic programs: uploading via upload 4 and migrating from the downsizing network (direct copy to secondary storage A). In order to reduce the storage pressure of the secondary storage A, the upload 4 is set as the main storage of the home economic program, the secondary storage C is still the standby storage, and the home economic program is only in the secondary storage A for automatic technical review, no longer Long-term retention. To achieve this goal, the migration strategy service has been modified as follows:
(1) Add "Secondary A to UP4" in the "Copy Strategy", and transfer the home economic program migrated from the downsizing network to the main secondary storage UP4 of the home economic program. In this configuration, the source storage area is selected as secondary storage A, and the target storage area is UP4. The channel is selected to play CH09 (home-owned channel) and CH10 (economic channel) dedicated to economic programs, and the program type is selected as "economical". The home has a program, which ensures that all home economic programs for home and economic channels will be migrated from secondary storage A to UP4.
(2) In the “Delete Copy Strategyâ€, the “Delete uploading 9-10 channel economists have programs†will be cancelled, so that the UP4 middle family has economic programs for long-term retention; and “Delete home has secondary A†is added for cleaning up. All homes stored in secondary storage A have economic programs.
(3) Modify "UP4 to Level 2A" in the original "Copy Strategy". Since the automatic technical review of all programs is performed in the secondary storage A, and the home has an economic program to the secondary storage C or is copied from the secondary storage A, this article cannot be deleted, but in order to ensure the secondary storage A The home economic programs that have been deleted are no longer copied repeatedly, so check the “materials are not reviewed†to ensure that only the unreviewed materials are migrated from UP4 to secondary storage A.
(4) Add “UP4 to 4M†and “UP4 to 4B†in “Copy Strategy†to ensure that all home economic programs are migrated with UP4 as the source, increasing the number of parallel tasks for the entire system copy task. .
Through this series of optimization adjustments, the pressure on the secondary storage space of our station is greatly reduced, and the number of parallel tasks of the copy task is improved, and the bandwidth utilization and migration efficiency are greatly improved.
As HD has become a must for the construction of TV station broadcast control systems, the requirements for the maintenance system are getting higher and higher. By properly planning the storage strategy of the system, the storage space of the entire system can be utilized to the maximum extent, and the use of bandwidth can be optimized to ensure the potential of the system is fully released to achieve broadcast security and work. The optimal combination of efficiency.
Text / generation for Wei Guizhou Radio and Television
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For TV stations, in addition to the reasonable planning of the storage system, you can also use the LTplay-300 ASI TS stream digital broadcast system, which can broadcast less than 150 megabytes of code stream to avoid different material generation formats or code streams. The big broken card phenomenon. The broadcast-level TS stream is also used to broadcast the card, and the digital video and audio stream is encoded into a TS stream. It does not need to be equipped with an encoder device, and directly enters the multiplexer, thereby saving equipment input, reducing code stream loss, and ensuring broadcast quality. The broadcast structure is stable and ensures broadcast security. Widely advertising!
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