Compression, Encryption and Hashing

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Learner resource 1 Compressing the compression 1. Using screen capture software (like free CamStudio), record a part of your screen. You can move a mouse about, run a slide show, etc. View the captured clip. How does it quality compare with the original? Could you confuse one for the other? 2. Play the resulting video clip on your chosen media player, while capturing the screen again. Note down the quality in this “second generation”. Why do you think it happened? 1 Learner resource 1 Compressing the compression 3. In CamStudio, we can trade-off quality for disk space by adjusting Video Options: 2 Learner resource 1 Compressing the compression There is also a selection of “codecs” – coders/encoders available in most Windows installations: • Microsoft Video 1 • Intel IYUV codec • Cinepak Codec by Radius Research the names of the codecs above. What are their strengths and weaknesses? Are they lossy or lossless? Why do we need so many of them? 3 Learner resource 1 Compressing the compression 4. Experiment with the different compression schemes and comment on the trade-off between quality and disk size. 5. Research the three sound formats MP3, FLAC and Ogg-Vorbis. Obtain the same recording in both formats and comment on the quality and disk size. What are the similarities and differences between these compression formats and the ones for video we have looked at in previous tasks? 4 Learner resource 1 Compressing the compression 6. Microsoft Powerpoint has an ability to convert between a few image formats. Find an image, insert it into a slide and then save in a different format. Comment on the quality and file size. Try all the formats that it works with, for example: • GIF Graphics Interchange Format • JPEG File Interchange Format • PNG Portable Network Graphics Format • TIFF Tag Image File Format • Device Independent Bitmap • Windows Metafile • Enhanced Windows Metafile 5.

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High Level Architecture Framework
Java Media Framework Multimedia Systems: Module 3 Lesson 1 Summary: Sources: H JMF Core Model H JMF 2.0 API Programmers m Guide from Sun: Architecture http://java.sun.com/products/java-media/jmf/2.1/guide/ m Models: time, event, data H JMF 2.0 API H JMF Core Functionality H JMF White Paper from IBM m Presentation http://www- 4.ibm.com/software/developer/library/jmf/jmfwhite. m Processing html m Capture m Storage and Transmission H JMF Extensibility High Level Architecture H A demultiplexer extracts individual tracks of media data JMF Applications, Applets, Beans from a multiplexed media stream. A mutliplexer performs the JMF Presentation and Processing API opposite function, it takes individual tracks of media data and merges them into a single JMF Plug-In API multiplexed media stream. H A codec performs media-data Muxes & Codecs Effects Renderers Demuxes compression and decompression. Each codec has certain input formats that it can handle and H A renderer is an abstraction of a certain output formats that it can presentation device. For audio, the generate presentation device is typically the H An effect filter modifies the computer's hardware audio card track data in some way, often to that outputs sound to the speakers. create special effects such as For video, the presentation device is blur or echo typically the computer monitor. Framework JMF H Media Streams m A media stream is the media data obtained from a local file, acquired over the network, or captured from a camera or microphone. Media streams often contain multiple channels of data called tracks.
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