DirectShow Editing Services (DES), introduced in DirectX 8.0/Windows XP is an API targeted at video editing tasks and built on top of the core DirectShow architecture. DirectShow Editing Services was introduced for Microsoft's Windows Movie Maker. It includes APIs for timeline and switching services, resizing, cropping, video and audio effects, as well as transitions, keying, automatic frame rate and sample rate conversion and such other features which are used in non-linear video editing allowing creation of composite media out of a number of source audio and video streams. DirectShow Editing Services allow higher-level run-time compositing, seeking support, and graph management, while still allowing applications to access lower-level DirectShow functions.
While the original API is in C++, DirectShow Editing Services is accessible in any Microsoft .NET compatible language including Microsoft Visual C# and Microsoft Visual Basic by using a third-party code library called "DirectShowNet Library". Alternatively, the entire DirectShow API, including DirectShow Editing Services, can be accessed from Borland Delphi 5, 6 and 7, C++ Builder 6, and from later versions with a few minor modifications, using a third party software library called "DSPack".
As of March, 2012 (and, apparently as early as 2009), Microsoft has stated that the DirectShow Editing Services, "API is not supported and may be altered or unavailable in the future."
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