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Transcript of Streaming Media at Penn State Kaspar Stromme Kim Winck Center for Education Technology Services Web...
Streaming Media at Penn State
Kaspar StrommeKim 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
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
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.
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
Media files are HUGE
Processing makes them SMALL
Reduce the Screen Size
320x240
160x120
Reduce the Frame Rate
TV = 29.97 fps
Film = 24 fps
Computer = ? fps
Reduce the Frame Rate (continued)
Low Motion High Motion
15-25 fps5-15 fps
Compression
JPEG TIFF
34K 237K
Compression (continued)
Non-lossy compression (GIF)
Lossy compression (JPEG)
CompressionDECompression
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, 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
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
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
Streaming Service
CAC/CETS Streaming Services Website
ets.cac.psu.edu/projects/streaming/www/index.htm