The Magic of OB Vans: Broadcasting on the Go скачать в хорошем качестве

The Magic of OB Vans: Broadcasting on the Go

The Magic of OB Vans: Broadcasting on the Go Outside broadcasting van(OB van) is the electronic field production (EFP) of television or radio programmes (typically to cover television news and sports television events) from a mobile remote broadcast television studio. Professional video camera and microphone signals come into the production truck for processing, recording and possibly transmission. Modern outside broadcasts now use specially designed OB vehicles, many of which are now built based around IP technology rather than relying on coaxial cable.[21] There has been an increasing rise in the use of flyaway or flypack Portable Production Units, which allow for an increased level of customisation and can be rigged in a larger variety of venues.[22] In the past many outside broadcasting applications have relied on using satellite uplinks to broadcast live audio and video back to the studio. While this has its advantages such as the ability to set up anywhere covered by the respective geostationary satellite, satellite uplinking is relatively expensive and the round trip latency is in the range of 240 to 280 milliseconds.[23] Production control[ This is the production hub of the vehicle, and is where the majority of the production crew sit in front of a wall of video monitors. The video monitors show all the video feeds from various sources, including computer graphics, professional video cameras, video servers and slow-motion replay machines. The wall of monitors contains a preview monitor showing what could be the next source on air and a program monitor that shows the feed currently going to air or being recorded. The keyed dirty feed (with digital on-screen graphic) is what is actually transmitted back to the central studio that is controlling the outside broadcast.[13] A clean feed (without the graphics) could be sent to other vehicles for use in their production.[14] Behind the directors there is usually a desk with monitors where the assistant producers can work. It is essential that the directors and assistant producers are in communication with each other during events, so that replays and slow-motion shots can be selected and aired. Chyron, a well known manufacturer of character generators, “keys” graphics over a specified source the TD chooses, but is generally used for images, and lower third messages, as well as occasionally smaller videos. The Bug Box character generator works the same way but is only for sporting events - the operator is in charge of ensuring that the time, score, and statistics are displayed on the broadcast as appropriate. Equipment Vision mixer – switch between multiple video feeds to produce an easy to watch television experience. Video monitor – monitor different routable sources on multiple monitors to help select which feed is the best at any given time. Character generator – used to generate a variety of graphics which can be keyed over a video source. Sound This is where the audio engineer (sound supervisor in the UK) uses a mixing console (being fed with all the various audio feeds: reporters, commentary, on-field microphones, etc.) to control which channels are added to the output and follows instructions from the director. They ensure that the audio is within pre-set limits, typically with the help of peak programme meters and loudness monitors. They relay the information from producers and directors to their A2's (audio assistants) who typically set up the audio cables and equipment throughout the arenas and the booth where the commentators sit. The audio engineer normally also has a dirty feed monitor to help with the synchronization of sound and video. Intercom is also generally the responsibility of the sound department. VTR The VTR area has a collection of machines including video servers and may also house additional power supplies or computer equipment. The "tape room" has VTR operators who monitor one or more cameras that go into machines and can be played back for replays when an exciting or important play occurs during the game. These operators can play back in slow motion or pause to show a key part of the action. VTR operators also play replay rollouts that lead into commercial breaks, run title sequences and introductory clips, or show the highlights of the event at the end of play.[20] This area is often called "EVS", after prominent supplier EVS Broadcast Equipment, who make replay machines and associated software. The transmission of the raw video feed from the remote location to the studio or master control is called backhaul. There are several ways of transmitting the backhaul: