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        Making Sense of Digital Media Technology
        By Douglas Dixon


 
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  DIGITAL VIDEO RESOURCES

  Manifest Technology Blog -- Site: | Articles | Galleries | Resources | DVI Tech | About | Site Map |
    Resources: | PC Video | Web Media | CD & DVD | Wireless Media | Home Media | PC Technology |
    PC Video: | PC Video Articles | Video Software Gallery | Video Editing Resources |
    Video Resources: | Digital Video References | Video Terminology | Video Glossary | Video Software Gallery | Pro Software Gallery |

Digital Video Editing Resources

Industry Organizations, Standards, Formats

    by Douglas Dixon

See also: 

PC Technology Resources  (Interfaces)
DVD Authoring References  (DVD formats)
Web Streaming Media Resources  (Streaming formats)
Handheld Media Resources  (Wireless formats)


Industry Organizations


National Association of Broadcasters (NAB)
    www.nab.org

NAB Electronic Media Show
    www.nabshow.com

Consumer Electronics Association (CEA)
    www.CE.org

Consumer Electronics Show (CES)
    www.cesweb.org

1394 Trade Association -- FireWire
    www.1394ta.com

DV and FireWire Central
    www.dvcentral.org

DVB Project (Digital Video Broadcasting)
    www.dvb.org

QUALCOMM MediaFLO
    www.qualcomm.com/mediaflo

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MPEG and Related Standards


HDV Information -- High-definition video on DV tape
    www.hdv-info.org

AVCHD format - MPEG-4/AVC in HD
    www.avchd-info.org

MPEG Committee Home Page
    mpeg.telecomitalialab.com ->
    www.chiariglione.org/mpeg/standards.htm

MPEG Industry Forum (MPEG-4)
    www.mpegif.org (www.m4if.org)

Professional-MPEG Forum ( Pro-MPEG Forum; Material eXchange Format - MXF)
    www.pro-mpeg.org

MPEG Pointers and Resources
    www.mpeg.org

MPEG-2 FAQ
    bmrc.berkeley.edu/projects/mpeg/faq/mpeg2.html

3rd Generation Partnership Project (3GPP)
    www.3gpp.org
    www.3gpp2.org

Apple - QuickTime and Mobile Multimedia
    www.apple.com/mpeg4/3gpp

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PC Video Formats


Digital Video Essentials - Joe Kane Productions
    www.videoessentials.com

John McGowan's AVI Overview
    www.jmcgowan.com/avi.html

Ligos - Intel Indeo Codecs
    www.ligos.com/indeo.htm

Codec Central
    www.discreet.com/support/codec  (old)
    www.siggraph.org/education/materials/HyperGraph/video/codecs/Default.htm

Microsoft Windows Media
    www.microsoft.com/windows/windowsmedia

Microsoft Windows Media Video HD (WMV HD)
    www.wmvhd.com

Windows Media Video High Definition DVD (WMV-HD DVD)
    www.microsoft.com/windows/windowsmedia/musicandvideo/hdvideo/HDVideo.aspx

Apple QuickTime home page
    www.apple.com/quicktime

RealNetworks
    www.real.com

DivX Networks
    www.divx.com

Macromedia Flash Video
    www.macromedia.com
    www.macromedia.com/devnet/mx/flash/video.html

HDV -- HD on DV

   

  • HD widescreen video on consumer Mini-DV tape
  • Convenient interfacing with computers
  • MPEG-2 video in HD resolution
        - 720p (1280 x 720) 
        - 1080i (1440 x 1080 -- not the full 1920 x 1080 of HDTV
  • www.hdv-info.org

AVCHD -- MPEG-4 AVC in HD

   

  • Jointly introduced by Sony and Panasonic
  • MPEG-4 AVC/H.264 video codec, 1080i and 720p, 16:9 widescreen
        multi-channel digital audio. Unlike other video recording systems, AVCHD does not record to tape, but 
  • Record video to hard drive, 8cm DVD, Memory Stick/SD -- not tape
  • www.avchd-info.org

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Audio Formats


Dolby Laboratories
    www.dolby.com

DTS -- Digital Theater Systems
     www.dtsonline.com

Sony SDDS (Sony Dynamic Digital Sound)
    www.sdds.com

Lucas THX
    www.thx.com

SRS Labs
    www.srslabs.com

Recommended Exposure Times

Accepted standards for recommended permissible exposure time for continuous time weighted average noise. According to NIOSH (National Institute of Occupational Safety and Health) and CDC (Center for Disease Control) guidelines issued in 2002

    See Ultimate Ears -- www.loudenough.com/faq

Continuous dB

Permissible Exposure Time

85dB    

8 Hours

88dB    

4 Hours

91dB    

2 Hours

94dB    

1 Hour

97dB    

30 Minutes

100dB 

15 Minutes

103dB 

7.5 Minutes

106dB 

<4 Minutes

109dB 

<2 Minutes

Sound Pressure Level (SPL), dB

Sound Pressure Level (SPL) numbers are a way of describing the relative level of a sound compared to the lowest possible sound a human can hear. The lowest physical sound pressure detectable by humans is 0.00002 pascal (Pa) and that equates to 0dB SPL.

To Calculate SPL in dB: dB SPL = 20*LOG (Sound Pressure/reference pressure, or, 0.00002). So, for a person sitting 3 feet from a television set, the sound pressure is 0.02Pa. The corresponding SPL in dB is: SPL = 20*LOG (0.02/0.00002) = 60dB

    See Ultimate Ears -- www.loudenough.com/faq

Real world SPL Levels

Event 

Approximate dB Level

Normal Conversation    

60dB

Busy NY Street            

70dB

City Traffic       

85dB

Truck Traffic    

90dB

Subway Train   

95dB

Power Mower 

107dB

Night Club        

115dB

Rock Concert   

120dB

Death of hearing tissue at 

180dB

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Digital Rights Management


Windows Media "Plays For Sure"  
    www.playsforsure.com

Microsoft Windows Media DRM
    www.microsoft.com/windows/windowsmedia/forpros/drm/default.mspx

CSS / DVD Copy Control Association
    www.dvdcca.org/css

AACS (Advanced Access Content System)
            www.aacsla.com

Digital Transmission Content Protection Over Internet Protocol (DTCP-IP)
    www.dtcp.com

DVD Copy Control Association (DVD CCA)
    www.dvdcca.org/css

   

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