Media Streaming By Derek Aten – Digital T.V. and HDTV Maria 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 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 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. m

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.