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COSC1078 Introduction to Information Technology Lecture 8 Video

James Harland james.harland@rmit.edu.au. COSC1078 Introduction to Information Technology Lecture 8 Video. Introduction. Who is this bloke?. Overview. Questions? WebLearn Test 1 Video Questions?. Introduction to IT. 1 Introduction 2 Images 3 Audio 4 Video WebLearnTest 1

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COSC1078 Introduction to Information Technology Lecture 8 Video

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  1. Intro to IT James Harland james.harland@rmit.edu.au COSC1078 Introduction to Information TechnologyLecture 8Video

  2. Intro to IT Introduction Who is this bloke?

  3. Intro to IT Overview • Questions? • WebLearn Test 1 • Video • Questions?

  4. Intro to IT Introduction to IT 1 Introduction 2Images 3Audio 4VideoWebLearnTest 1 5 Binary Representation Assignment 1 6 Data Storage 7Machine Processing 8 Operating Systems WebLearn Test 1 9 Processes Assignment 2 10 Internet 11Internet Security WebLearn Test 3 12Future of IT Assignment 3, Peer and Self Assessment

  5. Questions? How did you spend 6-8 hours on this course last week? This week? Lecture 8: Video SE Fundamentals

  6. Intro to IT Assessment Process • Submit all assignments via Blackboard in the Learning Hub • Assignment 1 due 11.59pm Sunday 1st April • Assignment 2 due 11.59pm Sunday 6th May • Assignment 3 due 11.59pm Sunday 27th May • Late assignments attract a penalty of 10% per day late, up to a maximum of 50%

  7. Intro to IT Assignment • Assignment will be in three parts • Overall task is to produce a video • Groups of up to 3 • Assessed by final video and group blog • Part 1: images and audio (end of week 5) • Part2: hardware (end of week 9) • Part 3: reflection, research (end of week 12)

  8. Intro to IT Assignment 1 • Use GIMP (or a similar tool) to perform some manipulations on an image • Use Audacity to perform some manipulations on sound • Use a movie making tool to produce something like (and much better than!) ‘Lord of the Controllers 1 & 2’ • Email me your group and its name so that I can set up a blog on the Learning Hub

  9. Overview 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010… Lecture 8: Video Intro to IT

  10. Images and Perspective … Frame rate is often 30 per second COOL! BORING! Lecture 8: Video Intro to IT

  11. Time codes and all that … Time for videos HH:MM:SS:FF HH hours MM minutes SS seconds FF frames Often 30 frames per second (nice and neat!) NTSC colour uses 29.97 frames per second (!!) This means there are two timecode systems …. Lecture 8: Video Intro to IT

  12. Non-drop-frame timecode HH:MM:SS:FF Behaves as expected Lecture 8: Video Intro to IT

  13. Drop-frame timecode HH;MM;SS;FF Seems bizarre! Skips time codes 00;01;00;00 00;01;00;01 00;02;00;00 00;02;00;01 00;03;00;00 00;03;00;01 …. 00;09;00;00 00;09;00;01 Skips 18 codes per 10 minutes 00;00;59;29 00;01;00;02 … 00;01;59;29 00;02;00;02 … 00;09;59;29 00;10;00;00 Lecture 8: Video Intro to IT

  14. Drop-frame timecode Lecture 8: Video Intro to IT

  15. Video file size Video files can be big! How much space is need for 1 second of HDTV? 1440 x 1080 pixels 24-bit colour 30 fps Stereo (2 audio channels) Audio sampling 48 kHz and 16-bit depth Lecture 8: Video Intro to IT

  16. Video file size Audio: 48,000 samples/s x 1s x 16 bits/sample x 2 = 1,536,000 bits = 192,000 byes ≈ 188 KB Video: 1440 x 1080 pixels/frame x 24 bits/pixel = 37,324,800 bits/frame 37,324,800 bits/frame x 30 fps x 1s = 1,119,744,000 bits = 139,968,000 bytes = 133 MB (!!) This takes 133MB per second! Need to compress Lecture 8: Video Intro to IT

  17. Colour Sampling Eye more sensitive to brightness than colour YUV model: Y luminance U,V chrominance 3 samples per pixel, so 12 samples per 4 pixels YUV YUV YUV YUV Y Y Y Y UV UV Y Y Y Y U U Lecture 8: Video Intro to IT

  18. File size and Data rate Overall file size is one thing 133MB x 60 minutes/second x 60 minutes/hour x x 2 hours = 957,600 MB ≈ 935 GB(!!) Still need to be able to extract data at 133MB per second, even for only 1 second … 48x CD is about 7MB per second … Lecture 8: Video Intro to IT

  19. Compressing Video Files • Lower frame size • Lower frame rate • Lower picture quality (ie data rate) • Lower colour depth (not often done …) • Lower audio quality (not much effect) • Compression methods (lossy vs lossless) • compressor/decompressor or codec Lecture 8: Video Intro to IT

  20. Intro to IT Conclusion • Get Assignment and WebTest done this week, if possible • Submit early! • Keep reading! (book particularly)

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