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12.m3 cms content-updating-pt2
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  • 1. IT2032PAContent Management System (CMS) Nitec in Social Media & Web Technology
  • 2. CMS Content UpdatingIn this chapter, you will learn: o Define what is “digital video” o Identify the various video format and their characteristics o Describe the advantages and disadvantages of the various formats across platforms. o Define what is “digital audio” o Identify the various sound formats and its characteristics
  • 3. VideoVideo is stream of data composed ofdiscrete frames, usually including bothaudio and pictures o US TV Signal = 30 fps o European stations = 15 fps o Movies = 24 fps
  • 4. VideoAnalog Video o It is the representation of information by variable physical quantities such as the size of electrical voltages.
  • 5. Video• Digital Video o is a sheet of dots, called pixels, each holding colour value.
  • 6. VideoVideo File FormatFile Platform PurposeExtension.MOV Mac, Win Mac’s * Once the movie is QuickTime compressed, the Video viewer must have the.AVI Mac, Win Microsoft’s same compressor to Audio Video play it back. Interleaved
  • 7. VideoVideo File FormatFile Platform PurposeExtension.MPEG Mac, Win, MPEG Video * Once the movie is Unix Mac may compressed, the have problem viewer must have the with the audio same compressor to track play it back.
  • 8. VideoVideo File FormatFile Platform PurposeExtension.ASF Mac, Win Microsoft Both .RM and .ASF streaming compression is format intended to produce a low data rate : may discard data as well as compress it, which is important for streaming used for distribution only
  • 9. VideoVideo File FormatFile Platform PurposeExtension.RM Mac, Win, Used by Both .RM and .ASF Unix RealNetworks compression is streaming intended to produce a low data rate : may discard data as well as compress it, which is important for streaming used for distribution only
  • 10. VideoCross Platform Dynamic Data Exchange (DDE) o allows data to be transmitted between client and a server o Hot link and/or cold link
  • 11. VideoCross Platform Object Linking and Embedding (OLE) o Lets you embed or link data objects created in different OS app o An embedded object becomes a part of the file into which it is pasted o A linked object is changed automatically in when the original file is updated
  • 12. Video CompressionLossless compression o The simplest form of digital video compression takes advantage of spatial redundancy – i.e areas of single picture that are the same.Lossy Compression o information is removed permanently.
  • 13. Video CompressionAdvantages of compression o smaller amount of storage is needed o compression allows highly miniaturized equipment for consumer and professionals o compression reduces the bandwidth needed o allows faster-than-real-time transfer between media.