Transcript Streaming Media at Penn State

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
stream
SERVER
CLIENT
A Fixed Data Rate
Network Bandwidth
Stream
What is Streaming (continued)

Unicasting – one to one

Multicasting – one to many
Streaming Media






Video
Audio
PowerPoint
Flash/Shockwave
VR
3D
Formats at PSU

QuickTime

Real Media

Windows Media

IBM VideoCharger
Not all media on the web streams

Download

Any server. Any file. Plays when done.
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.
Not all media on the web streams

Download


Fast start/progressive download


Any server. Any file. Plays when done.
Any server. Some files. Plays after a while.
Streaming

Some servers. Some files. Plays right away.
Streaming Media Files

Media files are
HUGE
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
A Few Basics
HUGE

Media files are

Processing makes them
SMALL
Reduce the Screen Size
160x120
320x240
Reduce the Frame Rate
TV = 29.97 fps
Film = 24 fps
Computer = ? fps
Reduce the Frame Rate
(continued)
Low Motion
High Motion
5-15 fps
15-25 fps
Compression
JPEG
TIFF
34K
237K
Compression (continued)

Non-lossy compression (GIF)

Lossy compression (JPEG)
Compression
DECompression

CODECs are the algorithms that compress
and decompress the media
Popular Codecs








Real
Advanced Streaming Format
Cinepak
Sorenson
MPEG 1, 2, 4, 7, MP3
PureVoice
Qdesign Music
ETC
How video compression works
Frame 1
Frame 2
?
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
Preparing Media (continued)




Try to use a high-quality tape format such as MiniDV, SVHS 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
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
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
Creating Video
(continued)

Upload video



Serve video


Save to Firewire, Web/FTP site, JAZ, Zip
Sign FMC Copyright Waiver
Web page
Play video


QuickTime Player
Examples: cac.psu.edu/streaming/examples.htm
Streaming Service
CAC/CETS Streaming Services Website
ets.cac.psu.edu/projects/streaming/www/index.htm