The document discusses Microsoft's Windows Media Audio and Video 9 Series codecs. It introduces several new codecs that improve video and audio quality at lower bitrates, including support for high-definition and multi-channel content. It highlights new capabilities like video smoothing to interpolate frames and a hybrid voice and music codec for low bitrate content. The codecs aim to achieve best quality while supporting embedded devices and hardware implementations.

1. Windows Media Audio & Video 9 Series 정지영 대리 Technical Specialist Microsoft Korea

2. WM Audio & Video 9 Series Key Design Pillars Best Audio Best Video Support for Embedded & Devices Improve quality/efficiency Extend the family to multi-channel/high resolution audio New innovation in voice and music compression Improve quality at all rates Enable HD playback Improved decoding performance Enable hardware (encode/decode) implementations Enable efficient hardware implementations Strong collaboration with partners for both PC peripherals and non-PC devices/chips

3. WM Audio & Video 9 Series New family of codecs Windows Media Video 9 Windows Media Video 9 Professional Windows Media Video 9 Screen Windows Media Video 9 Image Windows Media Audio 9 Windows Media Audio 9 Professional Windows Media Audio 9 Lossless Windows Media Audio 9 Voice

4. Windows Media Video 9 State-of-the-art Video compression engine Great quality from wireless  dial-up  high-definition video 160x120 @10kbps  1920x1080 (1080i/p) @ 3-20 Mbps+ Superb compression efficiency Three times as good as MPEG-2: Windows Media HD Video (1280x720p) at SD DVD rates (4-6 Mbps) Windows Media SD Video at DVD resolution (720x480p) at 2 Mbps (vs. 6 Mbps) Twice as good as MPEG-4 15% to 50% improvements over WMV 8 New professional level profiles for high data rate SD and HD Broadcast-ready Support for native-interlacing

5. Windows Media Video 9 Video Smoothing ( Frame Interpolation) Generates missing frames at playback time Can double or triple the decoded frame rate Improves perceived video quality/motion smoothness Especially useful at lower data rates where full frame rate is difficult to achieve Technology can also be used to save bandwidth Video can be encoded at lower data/frame rate E.g. ICP encodes 15 frames/sec, but user of WM9 Player will experience 30 fps Bandwidth reduction reduces operating cost for ICPs

6. Windows Media Video 9 DEMO vs. QuickTime 6/MPEG-4 Video Smoothing

7. Windows Media Video 9 Screen Highly efficient compression engine for “palletized video” Typical scenario is capturing application/desktop output for training/demo Entire desktop can be compressed and transmitted at rates as low as 28kbps! Original Version (V7) shipped in 2000 Version 9 improves in both picture quality and CPU usage More efficient handling of continuous-tone images and window dragging/scrolling Results in far higher frame rate

8. Windows Media Video 9 Screen DEMO WMV 9 Screen

9. WMA 9 Professional New high-performance audio codec to handle greater than CD resolution/channels Up to 96Khz sampling rate, 24-bits, and 8 channels (“7.1”) CD is stereo at 44Khz using 16-bit samples Target application is multi-channel music distribution and movie sound tracks at broadband rates Current multi-channel unsuitable due to high data rate E.g. minimum of 384kbps for Dolby Leaves too little for video on typical DSL/cable connection WMA Pro can handle 5.1 from just 128kbps Multiple encoding modes including 2-pass/VBR

10. WMA 9 Professional DEMO WMA 9 Professional 192K WMA Pro 5.1 vs. 192K MP3

11. Windows Media Audio 9 Lossless Mathematically lossless audio compression “ Rip once” – preserves full fidelity of the original Decoded stream matches the original bit-for-bit Customers no longer have to worry about ripping with ever improving audio codecs Range: CD resolution to 24-bit/96Khz/7.1 Compression ratio is 2:1 for CD source Good fit for ever increasing PC hard disks (200 CDs in 50GB hard disk) Competitive with top lossless audio codecs, e.g., Monkey, LPAC, MLP (DVD-Audio) Compression ratio improves as resolution/sampling rate/channel count increases because of increased redundancy Integrated into Windows Media Player 9 CD copy function

12. Windows Media Audio 9 Third iteration of backward compatible improvements to WMA 20% quality improvement over WMA 8 without changing decoded stream syntax Compatibility key to satisfying non-PC devices/partners New encoding modes deliver even better sound Quality-based VBR mode User can select quality instead of bit rate “ Perceptually lossless” mode Highest quality VBR encoding mode Indistinguishable from the original even for most audiophiles Typical compression ratio of 5:1 Available as a ripping option in Media Player 9 2-pass mode, applies to both CBR and VBR

13. Windows Media Audio 9 Voice Unique “hybrid” voice and music coder for low data rates (<= 20Kbps). First codec to properly handle mixed mode content (e.g. news plus musical commercial) Uses an auto/manual classifier to detect voice/music Applies appropriate coding mode for each segment Voice mode: new proprietary voice codec 20% better than ACELP shipping today (used by Real and WM) Music mode: WMA algorithms

14. WMA 9 Voice DEMO WMA 9 Voice

15. Windows Media Audio & Video 9 Summary Great video quality from low bit rates to HD 2x better than MPEG-4, 3x better than MPEG-2 Enhanced Screen codec Unique Video Smoothing Rich family of audio codecs with best quality in industry Multi-channel/high-res audio from 128-768 Kbps Improved WMA 9 backward compatible codec with VBR First “hybrid” speech/music codec Strong momentum in device space 130+ devices support WMA 30+ partners designing/porting WMV 9 encoders and decoders

16. Questions?

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18. Audio & Video Compression: Industry Comparison

19. Windows Media Audio& Video 9 Device Strategy WMA “bit stream syntax” already frozen for three years Key requirement for hardware implementation Many decoder chips/ports already available 130+ non-PC devices support WMA WMV 9: bit stream syntax frozen for the first time Actively working with 30+ hardware partners for decoders and encoders Many target applications from DVD players to STBs and video appliances DirectXVA hardware acceleration of WMV 9 decoding in graphic cards from all major manufacturers Broad licensing program available for both

20. Windows Media Video 9 Image New codec which enables still images to be transformed into full screen video using pan and zoom effects Cross dissolve transitions can be added between clips Results can be delivered at data rates as low as 20kbps Compressed using either 1-pass CBR or VBR, they can be shared as they are much smaller than the original images