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Codec, What’s a Codec? A Technophobes Guide to Digital Video

Codec, What’s a Codec? A Technophobes Guide to Digital Video. Joann Flick Agency for Instructional Technology. A Very Brief Overview of Digital Video Transmission Technologies. What the heck… Why you need to know… How to use this information and explain it to others…. Kbps Mbps Modem

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Codec, What’s a Codec? A Technophobes Guide to Digital Video

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  1. Codec, What’s a Codec? A Technophobes Guide to Digital Video Joann Flick Agency for Instructional Technology

  2. A Very Brief Overview of Digital Video Transmission Technologies • What the heck… • Why you need to know… • How to use this information and explain it to others…

  3. Kbps • Mbps • Modem • Codec • MPEG • ISDN • DSL • LAN • WAN • T-1 • POTS

  4. POTS = Plain Old Telephone Service • AKA dial-up connection • What most people use from home to access the Internet (really) • Size: soda straw 28-56 Kbps

  5. ISDN/DSL • ISDN: Integrated Systems Digital Network (64 Kbps) • DSL Digital Subscriber Line (512 Kbps) • Both use regular phone lines to bring higher-speed connectivity • Size: garden hose (at least 3 times to 10 times as big as the soda straw)

  6. T-1 • A long-distance, point-to-point, dedicated line that usually connects a computer network to the Internet • 1.544 Mbps • Size: a drainage pipe (3-10 times the size of the garden hose)

  7. LAN/WAN = Ethernet • Using copper wire(twisted pair) or coaxial cable, the most popular way of networking a bunch of computers within a building or campus • Fast, broad pipeline: 10-100 Mbps • Size: a drainage culvert (6-60 times the size of the T-1 line)

  8. Wireless LAN • Everything a LAN/WAN is, except the wires • Uses transmitters and receivers to move data around a network • 802.11

  9. Cable Broadband • Using a digital device, access to the Internet across existing cable TV service lines • Hefty bandwidth capacity: up to 500 Mbps • Size: A big drainage culvert (twice to 5 times the size of Ethernet)

  10. Datacasting • Uses a digital TV signal to send data to a receiving device connected to a computer • It’s a DOWNSTREAM delivery system • Lots of capacity (10-15 MBPS) • Size: drainage Culvert

  11. Codec

  12. Video Codec • Codec: Compression-Decompression or Coder-Decoder…a program for compressing all the millions of pixels in a video file so that it can be transmitted, decoded, and viewed. Not every single pixel of every single frame is transmitted, the Codec uses a kind of short hand to transmit enough info to construct the moving image.

  13. Types of Codecs • MPEG (1, 2, 4, 7…and more…) • Quicktime • MP3 (for audio)

  14. Codecs: how do they look? 48k

  15. Codecs: How do they look? 1.5M

  16. 48K 1.5 M

  17. Why?

  18. Why? Less information transmitted = less bandwidth consumed

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