media streaming by derek aten – digital t.v. and hdtv maria preciado – audio streaming genevieve...
TRANSCRIPT
Media Streaming
By Derek Aten – Digital T.V. and HDTVMaria Preciado – Audio Streaming
Genevieve Taduran – Data Streaming
Media Streaming
Streaming Media Streaming media is audio and video that is transmitted over the Internet in a streaming or continuous fashion, using data packets. The most effective reception of streaming media requires some form of broadband technology such as cable modem or DSL.
Introduction
Intro
Dividing a Station's Signal into Several "Channels"
Why Digital Pictures Are So Good
Interacting with TV Programs
Digital Television The idea of sending multiple programs within the 19.39
Mbps is unique to digital TV and is made possible by a
digital compression system.
The transmission is pure digital , along with reception and
display of those signals on the digital TV set.
Digital signals are transmitted through air, cable, and
satellite system.
Home use a decoder receives the signal and uses it, in
digital form, to directly drive your digital TV set.
High Definition TV High-resolution digital television combined with Dolby Digital
surround sound.
New production and transmission equipment at the HDTV
stations, as well as new equipment for reception by the
consumer.
Imagine 720 or 1080 lines of resolution compared to 525 lines
used in US
There are 18 DTV formats and 6 are HDTV formats, 5 are
based on progressive scanning and 1 on interlaced scanning.
Remaning formats 8 are SDTV with 4 of them for wide screen
16:9 ratios, the other 4 are 4:3 for normal viewing. The other
4 remaining are video graphics VGA formats.
Formats used in HDTV
720p – 1280*720 pixels progressive
1080i – 1920*1080 pixels interlaced
1080p – 1920*1080 pixels progressive
Sanning system Interlaced | Progressive
Interlaced format - the screen shows every odd line at the
screen, and follows that up with the even lines in a second
scan
Progressive format – scanning shows the whole picture, every
line in one showing. Better quality but more bandwidth.
High Definition TV
MPEG – 2 Digital TV is compressed and encoded using MPEG-2
Each image the MPEG-2 software records just enough of the
picture without making it look like something is missing.
Reduces the amount of data by about 55 to 1.
Standard for DVD video and some satellite TV broadcast
systems.
Compression reduces image quality from what is seen by the
digital camera at the studio.
The quality of the image is still better then analog TV.
HDTV receiver to interact with computer multimedia
applications directly
Audio Streaming
Audio Streaming •Audio streaming is a technique used for transferring audio
data
•Streaming technologies are becoming increasingly important
with the growth of the Internet
•With streaming, the client browser or plug-in can start
displaying the data before the entire file has been transmitted.
•For streaming to work, the client side receiving the data must
be able to collect the data and send it as a steady stream to the
application that is processing the data and converting it to
sound or pictures.
Type of Audio Streaming Applications
•Real Player
•Windows Media Player
•MusicMatch Jukebox
•Quicktime
Audio Streaming File Formats
The RealAudio Format•This format allows streaming of audio with low bandwidths. •Sounds stored in the RealAudio format have the extension .rm or .ram.
The AU Format•The AU format is supported by many different software systems over a
large range of platforms. •Sounds stored in the AU format have the extension .au.
The AIFF Format
•The AIFF (Audio Interchange File Format) was developed by Apple.
•Sounds stored in the AIFF format have the extension .aif or .aiff.
The WAVE Format
•The WAVE (waveform) format is developed by IBM and Microsoft.
•Sounds stored in the WAVE format have the extension .wav.
The MP3 Format (MPEG)
•MP3 files are MPEG files.
•MP3 is one of the most popular sound formats for music recording.
•Sounds stored in the MP3 format have the extension .mp3, or .mpga (for MPG
Audio).
Audio Streaming File Formats
Examples of Audio Streaming
The Killer Oldies
Website has a live
streaming radio.
www.killeroldies.com
Streaming vs. Downloading
-Pros/Cons
Audio File Downloading
Pros- Provides more accurate data
streaming- Less errors in transmission
Cons- Takes up disk space
Audio Streaming
Pros- streaming server opens a
conversation with the media player
Cons- Data accuracy is not great- Allows for data distortion
DATA STREAMING
OVERVIEW
Process Protocols Applications
DEFINITION
continuous transmission of data Unicast Multicast
.
PROCESS
Record media Digitize and create files – editing
softwares Place and provide access to files
for streaming
FILES
Different speeds - surestream (real media) - intelligent streaming (windows
media)
MEDIA PLAYERS
Real Player - Real Networks Windows Media Player - Microsoft Quicktime Player - Apple Mpeg TV Player - Linux/Unix Pocket TV – Windows CE devices
SERVERS
- Real Producer Basic- Windows Media Services- Windows Media Encoding Tools- QuickTime Streaming Server- QuickTime Pro
PROTOCOLS- RTP (RFC 1889)- RSTP (RFC 2326)- Shoutcast Streaming Protocol (MP3 streaming, HTTP streaming, Icecast)- Microsoft MMS MMSU – UDP MMST – TCP- MSBD- HTTP (RFC 2616) – port 80
APPLICATIONS
Entertainment Trading Military Schools Business
.