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-Multimedia Basics- Digital Video Integrating Technology into the Curriculum © Jim Lockard 2004 Multimedia Three “technologies“ Graphics (images) Audio Video Multimedia File Size How much does it matter? Impact of delivery method “Local” files No concern if on hard drive

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multimedia basics digital video

-Multimedia Basics-Digital Video

Integrating Technology

into the Curriculum

© Jim Lockard

2004

multimedia
Multimedia
  • Three “technologies“
    • Graphics (images)
    • Audio
    • Video
multimedia file size
Multimedia File Size
  • How much does it matter?
  • Impact of delivery method
    • “Local” files
      • No concern if on hard drive
        • Quickest load time
      • Other storage varies
        • CD, Zip, flash drive, network
    • Non-local files
      • Moving among computers
      • Download time from web
graphics files
Graphics Files
  • Size depends on
    • Image size (pixels)
    • Color depth (1-16M colors)
    • File format used (jpg, etc)
  • “full screen” x “full color”
    • 640*480*(24/8) =

921,600 bytes (nominal)

graphics size example
Graphics Size Example
  • Impact of file type for 640x480 image
  • Calculated = 921,600 bytes
  • BMP = 901K
  • GIF = 219K
    • 256 color max
  • JPG = 67K
  • Which format is “best?”
digital audio
Digital Audio
  • Quality Standard = CD
  • CD = 44,100kHz, 16-bit, stereo
    • 1 min = ca. 10MB!
    • 172kb/sec
  • FM Radio = 22,050kHz, 8-bit, mono
    • 1 min = ca. 1.25MB
    • 22kb/sec
  • Telephone = 11.025kHz, 8-bit, mono
    • 1 min = ca. 625K
file size download time optimum conditions
File Size & Download Time(Optimum Conditions)

Broadband

Modem

Typical song would take nearly 250 sec to download with T1 before playback can begin.

digital video
Digital Video
  • What is it?
    • Analog video — digitized
      • Most common
    • Original digital video
      • Newer technology
      • Catching on very rapidly
digital video benefits
Digital Video Benefits
  • Inexpensive computer hardware to create
  • Non-linear editing w/software
  • Just another (large) file = transmission potential (sort of)
    • FTP
    • email
    • web pages
  • More flexible (hyper) use
to create digital video
To Create Digital Video
  • Hardware
    • AnalogDigitizing Gear
      • $50 - $1000+
    • Digital camcorder + IEEE 1394
      • Firewire™ or iLink™
    • Mavica & other digital ‘still’ cameras
    • PC / web cameras (“golf balls”)
to create digital video11
To Create Digital Video
  • Software
    • Comes with hardware & XP
    • Capture first, then edit
      • Not always same software
    • Varies a lot (learning curve)
      • Match to need, time & skill
digital video issues
Digital Video Issues
  • Image quality (e.g., jagged lines)
  • Limited resizing (pixels, jerky)
  • Differing formats / architectures
  • Proprietary compression schemes
    • Broadway AVI, M-JPEG
  • Storage requirements / download time
digital video files
Digital Video Files
  • Video = “frames”
    • How many / sec?
  • Cf individual graphic image file size
  • Video = ++MB
digital video image size
Digital Video Image Size
  • Size (on screen)
    • Pixel dimensions
  • Common Sizes
    • 160 x 120 (1/16)
    • 320 x 240 (1/4)
    • 640 x 480 (‘full’ screen)
    • 720 x 480 (“DVD” wide screen)
  • What the viewer really sees?
    • Depends on screen resolution
digital video formats
Digital Video Formats
  • QuickTime (mov)
    • Compatibility issues
  • Video for Windows (avi)
    • No further development
  • MPEG (mpg, mpeg, mp#)
    • MPG1 = general use, Video CD
    • MPG2 = DVD
  • Streaming
    • Real vs MS vs QT
    • Initial or convert
dv file size factors
DV File SizeFactors
  • Image pixel dimensions (size)
  • FPS – how to choose, if possible?
  • File format (more later)
    • AVI to streaming (per software)
  • Compression scheme (codec)
    • Within AVI & QT, streaming
  • Audio sampling (quality)
impact of file size
Impact of File Size

Modem

Broadband

1 min video could take minutes to download

digital media
Digital Media
  • How to avoid “downloading”?
    • Can’t truly – files not local
    • Can avoid complete download
  • Streaming Media
    • Playback begins quickly
    • Download to buffer
    • FIFO
    • Competing Formats
original vs real low action 22 sec
Original vs Real (low action)22 sec.

Real (28K)

56K

AVI (IR32)

1.04MB

5 fps

MPEG1

Larger size

3.17MB

Real (56K)

93K

original vs real average 40 sec
Original vs Real (average)40 sec

Real 28.8

105K

Real 56K

176K

AVI (Cinepak)

24.6MB

MPEG1

6.18MB

Real LAN

778K

much detail at
Much detail at
  • www.niu.edu/facdev/media/mmc.htm
    • Click on Web Media
  • www3.niu.edu/facdev/media/presentations.htm
creating digital video demo
Creating Digital Video Demo
  • Pinnacle Studio 8
    • Hardware + Software
  • Microsoft MovieMaker
    • Software only
    • Windows XP only
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