Introduction and comparison of VOD video on demand technology

VOD (VideoOnDemand) video-on-demand technology is one of the new business hotspots developed on the Internet in recent years (originated in Japan, and the central computer system directly transmits movies or recorded programs to the home entertainment system according to the user's on-demand demand. . In the future, VOD is expected to enter other interactive TV services, including games, banking and personal finance, shopping and education services). It is divided into two methods: TVOD (TrueVOD for short VOD) and NVOD (NearVOD). For each on-demand request of TVOD, the server must output a corresponding video stream, which requires very large network bandwidth. NVOD can support the on-demand requests of any number of users. Although the bandwidth problem is solved, each user may have to wait a long time to get the corresponding service.

③ The number of concurrent streams is limited, the number of supported users is limited, and the unit user cost is high

NVOD (NearVideoOnDemand) quasi-video on demand is one of the value-added services of a one-way digital TV system. It uses a video server to delay a digital TV program in several digital channels. The user can wait for a period of time when ordering the program to watch the program in its entirety.

② The program arrangement adopts an intuitive graphical interface, and different colors are used to distinguish different playback states

④ Support mouse drag and drop selection, support batch adding programs, easy to add and delete

⑥ The system can automatically calculate and allocate the number of channels according to the program length and program interval

⑨ For database operations. It can realize the separation of programming and broadcasting

① Automatically extract data from the programming database to generate NVOD program form

② Use MPEG-2 private section (Privatesection) for encapsulation and transmission

③ Adopt a single PID structure, which can be sent to the multiplexer for multiplexing output

④ The program list is dynamically refreshed with the changes of the program schedule

⑤ The generation and output of the TS stream are carried out in the memory, no files are generated, which reduces the loss of the hard disk and improves the generation speed of the TS stream

⑥ The program schedule data contains the system real clock information of the front-end server, which is used to synchronize the clock of the set-top box with the front-end clock

PUSH-VOD is a video push service. This system can enable TV programs or popular science e-books to be directly transmitted to each set-top box via satellite and stored in it; so that ordinary people can watch these programs and browse e-books by way of on-demand.

PUSH-VOD is a broadcast pre-push service using a small amount of resources. In the off-peak hours, the hot resources that users care about are pushed, and a large amount of things can be stored between the user-side set-top boxes, which can also bring a certain amount of interactive benefits.

The concept of PUSH-VOD was not made out of thin air, but was proposed by imitating a very similar concept. It is a common phenomenon in Internet services, and there are pre-launched services in European and American countries. Internet services and cable TV on-demand services also have a large amount of access in a short period of time, which has caused a huge buffer and connection failure. European Union countries have carried out pre-launch, everyone interested in this business can order, pre-download and watch in advance. In the past, VOD was different. It used some resources to push it in a fixed time and large capacity.

One-way network can give full play to its advantages, because the idea and purpose of PUSH-VOD is to enable operators to obtain interactive functions and obtain value-added services without large-scale investment and two-way network transformation. Income. PUSH-VOD enables it to make good use of its advantages in a one-way network, and users are the same, and they can order their favorite videos, audios, pictures and other content at any time. It can also perform functions such as fast forward, rewind, search, and repeat playback, and the initial investment for operators is very small.

If hot programs can be pushed to the internal hard disk of the set-top box, it will greatly reduce the dedicated channel and broadcast stream resources actually occupied by users when ordering, and can effectively improve the effect of system operation.

At present, there are some special systems such as the party member education system and the rural information platform. They all have some common characteristics. The network environment does not necessarily have the conditions for two-way interaction, especially in remote areas, it is impossible to carry out large-scale two-way transformation. The content delivered is characterized by a large amount of information, which is likely to be a video, a large amount of text, and a large amount of pictures. Users must have complete initiative in terms of when to watch, what to watch, and how to watch.

The real two-way system or the real IPTV system PUSH-VOD is really useful, which is very similar to the two-way network, but also to solve the extreme situation of insufficient bandwidth of the end user. However, the PUSH-VOD in the IPTV environment is slightly different from the PUSH-VOD in the wired network. It uses the spare bandwidth of the business network to push the amount of data to the user's terminal little by little. In the wired system, a dedicated channel is used to push the large-scale data volume. Some movies may take 8 hours to download, but the PUSH-VOD system only takes 10 minutes to push it all down.

What are the problems encountered by VOD service operators that have been implemented now? In the first peak hours, resources are insufficient. During peak hours, many users will concentrate on ordering one or two hot movies. This results in a large concentration of resources within a short period of time. However, we cannot provide VOD services in a one-way network. Two-way transformation. How do current operators solve these problems? The problem of insufficient resources during peak hours is now unlimitedly increasing the number of streams and increasing the number of IPQAMs, which is impossible. On this basis, the operator has moved forward the media server and adopted the multi-mirror server approach.

On this basis, we have carried out in-depth thinking, whether we can further shift the server, and further decentralize the resources. At this time, we think about the resources of the vast number of end users, whether we can use the resources of end users to realize our VOD business. We found that when we really pushed the VOD service to the user's set-top box, IPQAM also increased. This is the idea of PUSH-VOD. The core idea is to download a large amount of content to all users' local terminals at the same time in a concentrated period of time in a broadcast mode, so that the system only needs to perform terminal local operations and not occupy when users actually use it. Network resources provide personalized services.

Compare several common types of cable digital TV network services. One is the most basic broadcast TV service, the other is NVOD, and the other is the real VOD service. What is the difference between these types of services: The broadcast service is still the same as the previous TV. Although there are more channels, the general audience has no choice, no choice of content, and what to watch. Relatively speaking, NVOD has a certain degree of selectivity. We can choose to view the content at different time periods, and whether the selectable content is fixed or determined by the operator. The interactive TV VOD business has very good interactive capabilities, which emphasizes the interactive capabilities, and there are many optional services. Obviously, the interactive TV business is a very popular business. However, it has not been promoted in large quantities. It is just done better in big cities. Many areas are shifting, involving the issue of interactive TV. The front-end requires a lot of manpower, financial resources, and material resources. NVOD can be completed by adding a small amount of servers and a small amount of resources, but a two-way transformation must be carried out to achieve interaction. From the perspective of the increased investment required to realize the service, broadcast and television have already achieved it, with very few NVOD and very many interactive television services. It can be seen that the interactive TV business is in contradiction with the PUSH-VOD system. Although it consumes a lot of resources, it has very good advantages and good interactivity.

Let's take a look at the comparison between PUSH-VOD and other VODs to see what advantages and disadvantages there are. First of all, make an assumption. If you want to broadcast in 500,000 cities, if there are 10,000 users who need on-demand services, our TV station broadcasts 20 popular programs every day, and each station orders 8 programs, and each program is averaged in NVOD. 4 sections to play. For comparison, for NVOD, the frequency point resources that need to be occupied are 8 frequency points, and PUSH-VOD needs to occupy 10 frequency points. For VOD, there is no concept of such an algorithm. As many users as there are users need to concentrate as much bandwidth and frequency. For PUSH-VOD, most users have downloaded it to the hard disk, using local resources instead of bandwidth resources.

How far(long) the transmitter cover?

The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far.

EXAMPLE 5W FM Transmitter use in the city and hometown:

I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile).

I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile).

I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft).

Below are the approximate range of different power FM Transmitters. ( The range is diameter )

0.1W ~ 5W FM Transmitter ：100M ~1KM

5W ~15W FM Ttransmitter : 1KM ~ 3KM

15W ~ 80W FM Transmitter : 3KM ~10KM

80W ~500W FM Transmitter : 10KM ~30KM

500W ~1000W FM Transmitter : 30KM ~ 50KM

1KW ~ 2KW FM Transmitter : 50KM ~100KM

2KW ~5KW FM Transmitter : 100KM ~150KM

5KW ~10KW FM Transmitter : 150KM ~200KM

How to contact us for the transmitter?

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