D3d11va

Direct3D 11 video acceleration on Windows, attached as a device context behind the ordinary h264, hevc, vp9, mpeg2video, vc1 and wmv3 decoders. Only the Windows builds carry it, which are the mingwX64 target and the JVM on Windows; on any other platform the request fails typed at open. Its frames stay in GPU memory (FrameInfo.isHardware) until Frame.downloadFromHardware copies them into main memory.