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Design Guidelines and Considerations for Building Windows Certified Network Media Devices
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| bet | 34/54 | | Sana | 21.03.2017 | | Hajmi | 8,14 Mb. | | #953 |
Support for Windows Media Codecs
Windows Media Format codecs are publically available and are an optional format in the DLNA specification.
Windows Media Audio Support
If a DMR supports audio, the DMR should support the following WMA profiles as specified in the DLNA 1.5 Media Formats specification (NETMEDIA-0024):
WMABASE
WMAFULL
Windows Media Video Support
If a DMR supports video, the DMR should support the following WMV profiles, as specified in the DLNA 1.5 Media Formats specification (NETMEDIA-0023):
WMVMED_BASE
WMVMED_FULL
WMVSPLL_BASE
WMVSPML_BASE
WMVHIGH_FULL
Windows Media Audio and Windows Media Video Certified Codecs
If WMA and WMV are implemented, a DMR must use WMA and WMV decoders that have passed the Microsoft integrated circuit (IC) test (NETMEDIA-0001).
Playing the Correct RES Element
The Windows 7 NSS transcodes source content into different RES elements. A DMR must choose a RES element that the DMR device can display (NETMEDIA-0025). The DMR device should select any RES element that can be rendered without requiring a transcode operation. If the device can play RES element #1, the device should prefer that element over a transcoded element.
Tips:
Some devices choose MPEG over other formats they support. This can create a poor experience if the user must endure a transcode even though the device supports the source media natively.
Devices should not choose to play or evaluate support for the media based only on the first returned RES element, even though Windows could provide the media to the device in a supported codec.
With Windows 7 transcode support, the DMR device is not required to support as many decoders.
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