Friday 17 October 2008

Week Two

In this lecture, we watched a streaming event on the University of Wisconsin website. They explained what streaming media is. Streaming media can be a live event where users tune in. The equipment needed is a camera, a video encoder and a server. It explained the difference between Unicast and Multicast. Unicast is the secure method and each owner had its own stream. It requires alot of bandwidth and a large network connection, and can have a large audience. Multicast is where data is sent in all directions and thus using less bandwidth.

Live events can be academic (used for coursework etc), research (uni functions and addresses by officials etc), admin (addresses by officials and for people who work at home), students(awards ceremonies or sporting events etc). Technical requirements needed for streaming media involve an encoder, which turns data into accessible data for the server to store. The server provides and splits the data to the users. Audiences need to access the stream, through a link on a website online. This then launches a player and connects to the server. They can also find out about the stream through email or phone. And the stream can be private or public. Media such as radio can be broadcast on a modem. But media such as video MUST be broadcast on broadband, on such rates as 256kbs (low), 800kbs(medium), or 1mbps (high + therefore a live broadcast). Broadcasters must realise that some users may not be able to tune in due to their bandwidth. The main format types that the data can be presented through are, quicktime, windows media player, realplayer, and nowadays, flash player (which can broadcast high quality video).
To make your own streaming event, you'd need technical staff to troubleshoot any errors, setup and provide maintenance and have experience in any equipment. You'd also need to provide the servers and the network. Altogether this would be pretty costly! Another way round this to contact the commercial provider who is supplies the server, but you are responsible for capturing the data. In streaming live events, the staff have to be aware for unexpected faults, like room location changes, network glitches or equipment failure.

I learnt alot from this streaming event, and it was benefit to me, because even though our group streaming won't be a live event, its always useful to know for the future, incase I decide to be part of a live streaming event. The information that I benefited from the most out of this lecture, was the unicast and multicast differences. Since this is our topic for our presentation, I was anxious to know the differences. Even though we have been researching the topics, I have been very confused between the differences between them. This information helped towards our presentation, and I now feel confident in the differences.

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