Abstract
Modern television production has promoted the simultaneous use of several cameras and sound sources, which increases the complexity and costs of broadcasting studios. This paper describes the design and implementation of a video-audio production mixer via an IP network. It is presented as a potential replacement for traditional professional production systems on the basis of cost reduction, as it is a software-based system that uses the existing technologies and can be built in community television stations and economic private productions. A prototype combining five cameras, a title generator, a multimedia player, microphone sound, music, and other resources for video recording or Internet live streaming has been implemented. The system also features a voice intercommunication capability to support teamwork. This technology has been mounted using different high-definition cameras with High-Definition Multimedia Interface (HDMI) outputs, desktop computers, mobile phones and other non-dedicated equipment available for free or at a low cost. Although it works on non-dedicated hardware, this system provides video routing, sound managing, and audiovisual mixing with an approximate total delay of only 1.4 s. It has been mounted mostly on Linux environments to guarantee reliability and the extensive use of free software, which demonstrates the feasibility of building a cost-effective video-audio production mixer, using the available devices and techniques.
Highlights
Television production may differ from its immediate historical predecessor, filmmaking, in the concept of live content generation
While modern filmmaking puts a considerable amount of effort into mounting celluloid and sound support, or its equivalent video editing, television has resorted to a combination of resources to produce content with a ‘‘live’’ style, based on the need to broadcast several hours of programs per day
Instead of using a single camera as in traditional filmmaking, television production has promoted the simultaneous use of several cameras and several sound sources, which increases the complexity of broadcasting studios
Summary
Television production may differ from its immediate historical predecessor, filmmaking, in the concept of live content generation. While modern filmmaking puts a considerable amount of effort into mounting celluloid and sound support, or its equivalent video editing, television has resorted to a combination of resources to produce content with a ‘‘live’’ style, based on the need to broadcast several hours of programs per day. Technological advances may simplify the use of hardware today [1], the resources required for live productions may still hinder some content generation projects [2], especially those with a low budget. The mixer is capable of visually synchronizing actions in cameras and microphones, so that movements look continuous from all points of view used Sound in this system was mixed separately via a set of tools known as Linux KX Studio [4]. Using a smartphone application (Unity Intercom), IP voice internal communications were integrated by means of Wi-Fi, another built-in capability
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