With the rapid development of TV production technology, multimedia technology has more and more room for expression in TV programs, from LED (Light Emitting Diode) large screens, LED tiles, to high-brightness projection devices, LED special effects display devices, etc. Various visual expressions have become more and more abundant, and multimedia technology has even participated in the composition of dance, the shaping of the environment, and the creation of atmosphere. The quality of multimedia technology applications greatly affects viewers' interest in programs. How to create corresponding visual effects according to the theme of different programs in the limited space of the studio is a difficult problem in the design of multimedia systems. The author will briefly introduce the type of multimedia display terminal, the composition and function of the multimedia system, and through the actual case, explore how to use the video server and other technical means to process and control the multimedia display terminal in the studio program production process. Serving art creation.
Multimedia display terminal and type
Small studios are usually designed with two LED systems, LED large screen and LED color screen. Some DLP (Digital Lighting Progress) stitching and projection technology will also be used in some special programs. . The LED large-screen system is used to position the center of the stage. The LED color screen system, DLP stitching and projection technology are arranged around the large LED screen, and the LED screen is matched with the large screen in the form of a scene to jointly cooperate with the dance. The LED display device can be designed with simple mechanical push-pull function, equipped with additional dance scenes or lamps, and completes the creativity of the whole picture with different themes, different programs, different dances and different lights, and constructs a virtual reality scene through unique picture expression techniques.
At present, LED display devices are developing towards polarization, one is to pursue high resolution (screen), and the other is to pursue high vacancy (color screen). The highest resolution pixel of the color screen has no high-resolution screen height, and the picture fineness is slightly insufficient; but the color screen has a price advantage, especially its simple construction system makes it very easy to install, and the hollow structure facilitates the light behind the scenes. Effective presentation, diverse installation design, diverse composition design, and diverse content performance bring more imagination to the stage art. In application, the system of LED color screen should be designed into a unified system with LED large screen and professional control terminal, thus obtaining stable system matching, rich picture expression, flexible control mode and precise synchronization. These will be the basic hardware requirements for building the basic functionality of a small studio.
The composition and function application of multimedia system
After the multimedia display unit is determined, how to make the visual effect shine is the key to the success or failure of the program. To achieve this goal, building a multimedia system requires integrating a range of hardware and software devices such as playback computers, video processors, splicers, special effects machines, nonlinear editing systems, and virtual studio software to meet the functions of implementing various ideas. demand. In such a complicated system configuration, how to achieve unified control and management is another major problem. In addition, we must also solve various problems in the use of the system, how to timely process the video screen, such as RGB color adjustment, contrast adjustment, playback speed adjustment; how to perform real-time screen editing. At this point, it can be made clear that only by combining various technologies and equipment reasonably and effectively, can we realize the production and expression of various visual ideas, but at the same time, we must pay attention to avoid excessive creation and form visual violence.
With the support of today's advanced technology, the video system for small multi-function studios should have at least instant editing and instant storage functions; and all TV programs can be edited twice according to the scene. As the demand for programs has increased and changed, in recent years, multimedia systems with professional video servers as the core have begun to form, as shown in Figure 1.
Video server application in multimedia system
In the following, combined with the use of the video server in the specific program site, the flexible processing and control functions are interpreted.
1. Multi-screen, multi-screen processing
Figure 2 shows the scene of the "International Awards Ceremony" program completed by a TV station studio. It can be seen that visually using multiple irregular LED screens to form the whole picture. Traditional methods of image processing come in two forms: or each screen is equipped with a playback computer, and the processor and video console are used for simultaneous playback of multiple images, which means that more than a dozen hardware devices will be served simultaneously. At the scene, the control personnel also need a number; or it is the rigorous and complicated video production in the early stage, which is almost impossible to adjust at the scene. . Figure 3 shows a multi-screen, multi-screen multimedia system with video server as the core. When the material is transferred and the screen size is edited in real time and transmitted to the corresponding display block, the scene can be completed quickly, easily and in real time. creation. Multi-layer playback window of multimedia video server, as shown in Figure 4, can be up to 12 layers.
2. Simultaneous editing of a single screen
Figure 5 shows the scene of a TV studio. From the picture, we can see that the LED screen in the middle has an opening and closing action. If the picture is just a simple left and right push-pull process, it is bound to feel that the overall effect of the presentation is very monotonous. With a video server, its excellent instant editor can use a simple video file, through the displacement editing (Y-axis rotation), it can match the on-site rotation and opening effect, showing a different vivid effect. Figure 6 is a block diagram of a multimedia system that implements instant editing. Figure 6 is a block diagram of a multimedia system that implements instant editing.
3. Special effects processing of simple materials
Figure 7 and Figure 5 are the same program scene, reflecting the scene of the dancer rehearsal. It can be seen from the figure that the LED large screen display is actually the same material, but after the special effects processing, they respectively show different effects.
4. Special material processing
Figure 8 is also the scene of the program of Figure 5, the screen is still using the same material, through the professional video processing system, the screen is separately added RGB color and special effects, enriching the display scene.
5. Blue screen image technology
Figure 9 shows a scene of a reading class in a TV studio. Using real-time blue screen keying technology, the host is like being in a luxury library. A few simple waving actions match the moving books in the picture, which is lively and lively. It seems to be full of books. This combination of virtual and real functions makes the cold LED screen live and interact with the program, becoming an effective means of active programming.
6. Electronic sign-in interaction with LED big screen
Figure 10 is also the scene of the program of Figure 9. The host or guest is on the stage to sign the electronic input device such as a tablet computer, using the electronic sign-in and instant messaging technology of the video server to make the signature appear on the open book of the LED large screen at the same time. The content of the program interacts with the LED display.
7. Overlay processing
Figure 11 shows the scene of a public service program in a TV studio. The stage structure is quite simple. Only a large LED screen in the middle is used as a background. How to make such a monotonous background new and surprising, so that the LED large screen is no longer monotonous, the selection of equipment and people The idea becomes the key. In the creative process, using the rich functions of the video server, the focus of creativity is on how to make the plane things three-dimensional. In the specific method, through the playback of the video material and the overlay of the back base map, and then cooperate with the stage mechanical push-pull in the middle of the LED, let the performer directly climb the stage from the big screen, and use the LED screen to create the depth of the stage, showing the three-dimensional effect.
For small studios, the design of multimedia systems should have the following characteristics: flexible layout, rich system functions, convenient and real-time operation, safe and reliable, and strong expandability. It should also achieve perfect synchronization with other studio lighting and sound systems. At the same time, due to the characteristics of domestic programming, the multimedia system should have real-time programmability, and always meet the needs of the creative staff on-site creation.
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