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

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Presentation on theme: "Codec, What’s a Codec? A Technophobes Guide to Digital Video Joann Flick Agency for Instructional Technology."— Presentation transcript:

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 Less information transmitted = less bandwidth consumed

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