The document discusses technologies used for multimedia applications over the internet. It covers topics like processors with SIMD and SSE extensions to accelerate multimedia tasks, hyperthreading and dual-CPU configurations for higher performance, MP3 and other codecs for compressing audio and video, and broadband speeds needed for transmitting compressed multimedia content like movies. Newer processors include enhancements to help accelerate multimedia applications through techniques like SIMD, hyperthreading, and additional floating-point and data processing instructions.

1. MMTA – Technology PC – become standard for MM applications Not elegant solution – x86 designed as general purpose CPU A more elegant solution: high performance graphics workstation networked to a dedicated high performance server - SUN workstation

3. MMTA – Technology Internet Bandwidth and Data Rates Even with broadband many applications perform poorly because of restricted or shared bandwidth Large Multimedia file sizes not compatible with Internet rates Compression helps – CPU processing needed Hardware and software technologies

6. MMTA – Technology Hyperthreading Thread – individual process or task Intel-proprietary technology For each processor core that is physically present, the operating system addresses two virtual processors. Shares the workload between them 5% more die area, the performance 15–30% better

7. MMTA – Technology MP3 Technology More efficient than WAV files Quality loss not noticed by most users Data for 10 seconds – WAV – MP3 – MIDI 900kB, 16kB, 2kB

8. MMTA – Technology Sound/ Music transmission times: CD track – 50Mbytes Modem - 56 kb/s – 7000s = 2 hours With MP3 encoding ~ 700s = 12 minutes Less demanding sounds – telephone (Skype?) Compressed 100:1 with MP3 Time at 10MB/s broadband? DVD full length movies?

9. MMTA – Technology Video data rates Video compression depends on application Flash – uses vector graphics – small files Video at 1024 by 768 24-bit true colour at 50 frames per second requires 940 Mbits/second uncompressed

10. MMTA – Technology Codec Compressor/ Decompressor Or Coder / Decoder There are Audio and Video codecs Lossless and lossy codecs Typical video compression; 3:1 lossless, 100:1 lossy WMP v10 codecs: http:// support.microsoft.com/default.aspx?scid =kb;en-us;899113 Link http://www.techsupportalert.com/understanding-codecs.htm – lab next week

11. MMTA – Technology .avi Movie Clip requires about 12 MBytes for 60 seconds .. suitable for viewing in 1/9 of the screen area of a PC a simple.avi animation requires about 400k for a 10 second presentation

12. MMTA – Other technologies Question: What is the result of this on transmitting video across the Internet ? Wiki List of monochrome and RGB palettes

13. MMTA – Technology Broadband 50 Mb – fibre optic

14. MMTA – Technology http://speedtest.net/ MMU/Janet – 9Mb/s Melbourne – 1Mb/s HD movie can be well over 15GB 50Mb – 45 minutes

15. MMTA – Technology Other Techniques for Multimedia – Software Applications Java Security Issues and Java Mobile Phones and Java Next week