Photo] slow motion on the hard drive technology in the production application - hard, slow-motion p

Photo] slow motion on the hard drive technology in the production application - hard

, slow-motion p

Of: Sheng Xiaohui President, Shanghai Media Group Technology Operations Center video engineer.

Key words: slow-motion video server making

Shanghai and the world in recent years, sports such as F1, V8 Touring, NBA preseason, Tennis Masters Cup, the World Table Tennis Championships, the active cooperation projects, enable us to broadcast ideas to open up the same time, recognize the hard disk slow motion technology in broadcast important role. It allows the audience can enjoy a more comprehensive perspective, the details are rich picture, and even the match process, the two coaches and the players are fine panoramic view of the mood change is also greatly enhanced the sense of live sports broadcast. This article focuses on how to make good use of slow motion in broadcast technology.

Slow-motion system We all know, the traditional slow-motion system is based on the tape recorder, a remote control panel configured to achieve different speeds of playback, many television stations broadcast the car still preserved the device. This slow-motion way of making simple, inexpensive device, but it has a drawback that can not be recorded during playback. The sport is characterized by rapidly changing, if missed during playback highlights of the audience is undoubtedly a great pity. In addition, it needs to rewind time to a lower speed playback picture quality is not high, the show has broken magnetic field and so will produce less than black are restricting the slow-motion quality.

To solve these problems, some foreign companies developing technology-based hard drive slow-motion system, popular with Grass Valley (GVG) Company Profile, Ao Wei (Orad) the company's Forum and the EVS's SLSM, they have Director.

Profile video server Profile Series next-generation media platform ProfileXP, also supports SD and HD; modular structure, scalable software, hardware, RAID storage and remote error detection, and easy to maintain chassis structure, making it the industry with high scalability and upgrading the performance of video servers.

PVS1100 video server is produced for applications such as news and sports, while the optimal design, which features support for DVCPRO, DVCPRO50, 50Mb / s when the MPEG-24: 2:2 I frame and the D10 and other formats; configuration includes 2, 4,6 and 8 two-way channel, re-configured according to need, and all the channels to provide enhanced slow-motion capability, in order to achieve without flashing the player. To co-production and production processes, PVS1100 internal configuration of the dual-channel SDTI, capable of up to 4 times faster real-time recording of compressed video from the tape recorder. Permit more than 50 ProfileXP comprehensive media platform development software application developers. PVS1100 support GVG applications, including remote monitoring of SNMP-based software and ProfileInSyncTM NetCentralTM automatic mirroring software. Although the Profile is very draft

stability and good extension, but it is not devoted to slow-motion production, after all, the hard disk server with third-party application development considerations have not been thorough enough, nor strong operational on high-speed support there is a problem, since there is no perfect solution for slow motion, not for the live broadcast of sports programs.

Forum Video Server Forum is a multi-channel slow-motion video servers, mainly two parts: Forum server host and ElefantII management control unit. It is a total of six channels, you can also set the four-channel recording or playback, the router can be set through internal channels of input and output, provides the user with a high degree of autonomy. As the use of wavelet compression technology, Forum provides amazing video playback quality, image quality will not change with the playback speed changes. Super slow motion contains audio configuration, each channel, 4 channel audio follow the video while recording, the audio is uncompressed format. It supports external Time-Code devices and SonyBVW protocol that allows seamless embedding tape recorder reset signal, and to ensure redundancy. Equipped with dual power, storage capacity of the Forum can be of different continuous recording 24 ~ 72h (4:1 compression ratio), the standard recording time is 48h. In addition, using external RAID5 unit connected Forum, can replace the built-in memory.

Figure 1 Elefant panel connection with the case of the host

ElefantII is the Forum, Control Panel, configure precise and durable Jog / Shuttle search round, tape recorders offer similar mode of operation. Set highlights and the time just the press of a button, to quickly edit the broadcast list; can be any playback speed, camera angle change can be a smooth transition; use of user-defined keys that can quickly be a lot of wonderful pieces according to different arrangement of the subject categories, and quickly edit the playlist. Management Forum by ElefantII control panel, you can use Windows-based software, such as through the direct control of the software OradCyber-Sport Forum. The latter control method for a sporting event has provided a new live effects, such as static or dynamic can be drawn offside line, measuring ball, the trajectory of the ball mark applications.

Forum is a slow-motion system can be upgraded hard disk, in the need to simultaneously record the case of many slots, you can Forum cascade through the SDTI network to transmit data.

Forum's specialty is CyberGraphic and CyberSport broadcast graphics systems, making the process slow motion with special effects that can plug into three-dimensional subtitles, recently increased the insert on the screen in court to explain the functions of three-dimensional graphics. The drawback is: Elefant panel complicated connection to the host; only support SonyBVW and a few control protocol; edit Collection (PlayList) is rather complicated; does not support high-speed; relatively poor scalability.

EVS hard disk recorders SLSM a DVR EVS slow motion early, because there is no audio module, also equipped with a digital audio accessories EVS connected with the host, can be remote. The machine has good stability, because they do not support the SDTI network, this single model has does not apply to major sports events on television.

This, EVS introduced a new generation product LSM-XT, which has six channels, to support 4:2:2 10b270MHzSDI signals are free to set input and output, 16 AES / EBU and 8 ANOLOG audio input / output port, RAID3 array, support SDTI network, and MAXS, Airbox, etc. Sport-Net network of facilities for large-scale sports events broadcast. L

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