Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web...

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Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001

Transcript of Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web...

Page 1: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Streaming Media at Penn State

Kaspar StrommeKim Winck

Center for Education Technology Services Web 2001 Conference, June26, 2001

Page 2: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

What is Streaming A technique for transferring data over a

network such that it can be processed as a steady and continuous stream

SERVER CLIENT

stream

Page 3: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

A Fixed Data Rate

Network Bandwidth

Stream

Page 4: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

What is Streaming (continued) Unicasting – one to one

Multicasting – one to many

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Streaming Media

Video Audio PowerPoint Flash/Shockwave VR 3D

Page 6: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Formats at PSU

QuickTime

Real Media

Windows Media

IBM VideoCharger

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Not all media on the web streams Download

Any server. Any file. Plays when done.

Page 8: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Not all media on the web streams Download

Any server. Any file. Plays when done.

Fast start/progressive download Any server. Some files. Plays after a while.

Page 9: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Not all media on the web streams Download

Any server. Any file. Plays when done.

Fast start/progressive download Any server. Some files. Plays after a while.

Streaming Some servers. Some files. Plays right away.

Page 10: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Streaming Media Files

Media files are HUGE

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What’s the size of your pipe?

• Modem (89%)

• ISDN

• Cable/DSL

• LAN

Source: Internet.com April 2001

http://cyberatlas.internet.com/big_picture/geographics

Page 12: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

A Few Basics

Media files are HUGE

Processing makes them SMALL

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Reduce the Screen Size

320x240

160x120

Page 14: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Reduce the Frame Rate

TV = 29.97 fps

Film = 24 fps

Computer = ? fps

Page 15: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Reduce the Frame Rate (continued)

Low Motion High Motion

15-25 fps5-15 fps

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Compression

JPEG TIFF

34K 237K

Page 17: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Compression (continued)

Non-lossy compression (GIF)

Lossy compression (JPEG)

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CompressionDECompression

CODECs are the algorithms that compress and decompress the media

Page 19: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Popular Codecs Real Advanced Streaming Format Cinepak Sorenson MPEG 1, 2, 4, 7, MP3 PureVoice Qdesign Music ETC

Page 20: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

How video compression works

?

Frame 1 Frame 2

Page 21: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Preparing Media for Compression

Shoot tighter shots Minimize camera movements such as zooms and

pans Try to shoot against plain backgrounds with little

activity Always use a tripod for steady shots Turn auto focus off, this avoids unintended focusing

Page 22: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Preparing Media (continued) Try to use a high-quality tape format such as

MiniDV, S-VHS or Hi8 Use new tapes to avoid glitches, dropouts, and

other image degradation Record in a quiet environment with little or no

background noise if possible Use high-quality recording equipment to minimize

noise

Page 23: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Creating Video for Streaming at PSU Prepare video

DV Cameras at Media Tech: www.libraries.psu.edu/mtss/

Digitize and edit video CAC/CETS Digital Video Editing Seminars: cac.psu.edu

/training Software: iMovie, Adobe Premiere, Media Cleaner

Page 24: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Creating Video(continued) Where to digitize and edit video

CAC Multimedia Labs- Pollock Library, 302 Patterson, 107 Rackley

Faculty appointment in the Faculty Multimedia Center : cac.psu.edu/fmc

Encode video for CAC/CETS Streaming Server: cac.psu.edu/streaming/specs.htm

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Creating Video(continued) Upload video

Save to Firewire, Web/FTP site, JAZ, Zip Sign FMC Copyright Waiver

Serve video Web page

Play video QuickTime Player Examples: cac.psu.edu/streaming/examples.htm

Page 26: Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web 2001 Conference, June26, 2001.

Streaming Service

CAC/CETS Streaming Services Website

ets.cac.psu.edu/projects/streaming/www/index.htm