[A longer version of this article by Hannah Rudman was first published in Arts Professional magazine, issue 222, 19.07.10]
A webcast is a media file distributed over the Internet using streaming media technology to distribute a single linear content source to many simultaneous listeners/viewers. A webcast may either be distributed live, or on demand. Webcasting used to be defined as “broadcasting” over the internet, but that no longer quite fits: many webcasting platforms now offer tools that encourage online audience interaction – with the live event and with other onliners.
Webcasting is not web or videoconferencing, which is designed for many-to-many interaction. Nor is webcasting the technology that delivers NTLive! or the Met Opera into cinemas around the country – this is simulcast technology, which uses satellite systems to deliver a live broadcast to digital data projection screens. Simulcasting produces an exquisite aesthetic (millions of colours, 5:1 surround sound) but requires a completely different level of production and delivery for this quality to be guaranteed. It is therefore extremely costly and out of range for many cultural organizations. Neither is webcasting the technology behind the BBC’s £125m iPlayer, so its important not expect the same result.
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