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Transcript

  • 1. Streaming Multimedia
  • 2. What is streaming?
    • Streaming media consists of sound and video, continuously “streamed” over the Internet
  • 3. Streaming media (continued)
    • Streaming media may be either video or audio, or most commonly a combination of both.
    • There are two categories of streaming, pseudo and genuine streaming
    • Pseudo streaming allows for immediate playback as the file is downloaded whilst it is playing. Pseudo streaming uses pre-compressed data
    • Genuine streaming requires a specialised server and compresses the data on-the-fly, delivering content in an efficient format
  • 4. The Principle of Streaming The Principle of Streaming (A snapshot in time)
  • 5. Limitations on Streaming types
    • Because video and audio data can be quite large, compression is an integral part of streaming
    • Pseudo streaming uses pre-compressed files and only allows users to view media sequentially; you cannot skip to a set point in the stream
    • Genuine streaming allows a user to navigate to any point in the stream, but requires a dedicated server to do this. Genuine streaming files must be prepared specially for delivery
  • 6. What’s going on behind the scenes on the servers?
  • 7. Formats of Streaming
    • There are many formats of streaming available. Some of the more common formats are:
      • RealPlayer
      • Windows Media Player
      • Quicktime
      • Flash
  • 8. What do the different formats do?
    • Each format uses a different algorithm for compressing and embedding the streaming data
    • Different manufacturers place emphasis on different aspects: video, sound, speed, bandwidth
    • Because of the competitiveness of the different manufacturers, each format represents a different means of achieving effective multimedia streaming
  • 9. Different formats (continued)
    • Common to virtually all formats is the MPEG compression algorithm
    • MPEG ( Moving Picture Experts Group) develops standards for the compression of digital video and audio
    • The actual compression is often referred to as a codec ( co der/ dec oder)
    • Common MPEG standards deliver video at up to 8Mbps and audio at up to 96kbps
  • 10. Why use streaming?
    • Streaming allows for the delivery of high-impact, engaging and often interactive content
    • Streaming is typically very flexible and can be distributed widely in a variety of formats
    • Standard video and audio content is too large to deliver via traditional formats. Streaming formats offer incredible compression and very effective delivery.
  • 11. When to use streaming
    • Multimedia content in any fashion is a two edged sword. It can quite literally make or break a website
    • Users of a website must be able to efficiently and effectively navigate a site. Use of extraneous multimedia can be detrimental.
    • Not all users have access to high-speed internet connections. Multimedia can very quickly chew up a users available bandwidth, frustrating them if they cannot see multimedia as the author intended.
  • 12. When to use streaming (continued)
    • With correct application, relevance and attention to issues such as performance, multimedia can be used to enhance any website.
    • For example: Multimedia streaming can be used as a self-serve sales tool. Instead of a customer waiting to receive literature of a product, they can view a video clip advertisement.
  • 13. Considerations for streaming
    • Bandwidth, bandwidth, bandwidth!
    • Multimedia streaming in almost any format will take up a significant portion of a user’s available bandwidth. Some players will wait until a buffer of data is received before playback commences. This can result in a constant stop-start effect in the stream. This can be very annoying!
  • 14. Adding streaming to your website
    • Streaming can be inserted into your website using either an Anchor tag, or using an Embed tag
      • <object classid=&quot;clsid:D27CDB6E-AE6D-11cf-96B8-444553540000&quot; codebase=&quot;http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0&quot; width=&quot;300&quot; height=&quot;55&quot; vspace=&quot;20&quot; align=&quot;middle&quot;>
      • <param name=&quot;movie&quot; value=&quot;../images/flickerboardnosound.swf&quot;>
      • <param name=&quot;quality&quot; value=&quot;high&quot;>
      • <param name=&quot;LOOP&quot; value=&quot;false&quot;>
      • <embed src=&quot;../images/flickerboardnosound.swf&quot; width=&quot;300&quot; height=&quot;55&quot; vspace=&quot;20&quot; loop=&quot;false&quot; align=&quot;middle&quot; quality=&quot;high&quot; pluginspage=&quot;http://www.macromedia.com/go/getflashplayer&quot; type=&quot;application/x-shockwave- flash&quot;></embed>
      • </object>
  • 15. Decision: Pseudo or genuine streaming?
    • You will need to decide on the best content delivery system.
    • Pseudo streaming will require sufficient bandwidth from the hosting server to deliver content
    • Genuine streaming will calculate the optimum bandwidth delivery to the client.
  • 16. Don’t forget to test, test, test…
    • Check the delivery of your content over a variety of connection speeds and conditions; remember your target audience will judge the value of the streaming on it’s performance as much as anything else!
    • Make sure that you are delivering a common format. Obscure formats won’t win you any friends.
    • Consider whether the target audience will need to download new codecs to see the stream
  • 17. Other directions
    • Streaming is not just limited to delivering video and audio over the Internet. New developments include multi-casting, pod-casting and live streams.
    • Streaming is constantly changing, and in an ever-competitive world, the technology is being driven to deliver more and more.
    • Always remember, that while technology changes, your multimedia must still be relevant and efficient for it to work.
  • 18. Live Streaming: What’s happening behind the scenes?
  • 19. And now…
    • Vividas delivers broadcast quality video and audio real-time without the need for end-user software or players.
    • Explore some of the videos on showcase at the following site:
    • http://www.vividas.com
  • 20. Some final considerations
    • Legal issues are very important to consider when streaming
    • Make sure that you have the permission of a copyright owner before streaming someone else’s content
    • Don’t forget to protect your own work
    • See a legal professional for the best ways to protect yourself and your multimedia work
  • 21. Streaming
    • References
    • How Streaming Video and Audio Work
    • http://computer.howstuffworks.com/streaming-video-and-audio.htm
    • Embedding Streaming Video Files
    • http://www.free-video-hosting.net/embed.php
    • Acknowledgements
    • This lecture was further developed from previous lectures by Sean Kelleher and Peter Somerville