Media Streaming-final.ppt


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Media Streaming-final.ppt

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