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Pretty self explanatory. Microsoft had DirectShow for DirectX 9, but using DirectShow with DX11 is a COM nightmare beyond words. Is there a standard for video rendering I haven't heard of, or perhaps a free third-party library for this purpose?
Edit: Thanks to Mgetz, I am aware of Microsoft's attempt at a solution, Media Foundation. However, it's limited to Windows 8+, which I would much prefer to avoid.
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DirectX 11 brings three new stages (hull shader, tessellator, and domain shader) to the rendering pipeline. These stages enable flexible, programmable hardware support of tessellation.
The Direct3D 11 API for stereoscopic 3-D video unpacks stereo frames into left- and right-eye images. It has parity with DirectX Video Acceleration (DXVA) 2.0 and DXVA-HD in decoding and video processing capabilities. It works in Session 0 for transcoding scenarios.
This may not exactly match your requirement, but for your GOAL, you may take a look on ffmpeg, libx264 and theora(for ogg sound) or faad(decode aac).
I have done using ffmpeg to open container(3gp/mp4 is simple to implment yourself btw if full GPL licence is a concern), libx264 to decode to frame and upload to opengl texture, performance is good (on mac pro it can render 50 fps for 1080p without optimization) and by getting your hand dirty you can have fun doing stupid things with the texture and 3d transforms.
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Media Foundation says that it "enables the development of applications and components for using digital media on Windows Vista and later."
So, it looks like it should work for Vista, Windows 7, and Windows 8.
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