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Microsoft Windows Logo Program System and Device Requirements  —  165

audio from the Internet.

B11.1.4.4.3 DELETED
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B11.1.4.4.5 On desktop system, MPEG sources support bus mastering; MPEG-2 MP@ML playback and video decode implementations meet requirements.

Mobile PC Note: See B11.1.4.5.

B11.1.4.4.6 On desktop system, all graphics and video capabilities must be fully supported at 1024 × 768, 32 bpp mode or better.

Mobile PC Note: See B11.1.4.5.

B11.1.4.4.7 Synchronized audio and video, no tearing or other artifacts (macroblocking, jaggies, and so on).

Video stream playback is audio-video synchronized to within 75 ms. Audio-video synchronization drift is corrected without violating the specifics of the frame rate and field rate requirements.

B11.1.4.4.8 Video implementation preserves source quality during playback, storage, and processing.

Video implementation must preserve source quality during playback, storage, or processing of the video streams and not adversely affect overall PC performance.

The requirements include the following.

Video source frame and field rates must be preserved to memory and to the display. While in steady-state mode, dropped frames may not exceed one per minute.

Video source resolution must be preserved to memory and to the display.

Video source quality must be preserved to memory and display. Image entropy consistent with approximately 400 TV lines of vertical resolution must be preserved.

Video is made available through input or transform filters in the YUY2 color format while maintaining all other baseline video requirements.

B11.1.4.5 Mobile system meets standard video requirements if video playback is supported

Mobile PC Note: Support is required for up to native display resolution or XGA where native resolution is greater than XGA (1024x768). There are no CPU utilization limitations or bus bandwidth restrictions for MPEG-2 playback on a mobile PC.

A mobile system is not required to support any motion video capabilities, such as playback. The basic video requirements for such mobile PC systems are:

Support all related desktop video requirements if the mobile system implements support for optional video capabilities.

B11.1.5 General Streaming - FAQs

See http://www.microsoft.com/winlogo/hardware/.

© 1999-2002 Microsoft Corporation. All rights reserved.

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