This is a library from Intel which can be installed as part of the Intel Media SDK, and supports a subset of encode and decode cases. These are standard Windows APIs, which are implemented by the Intel graphics driver to support video decode. There's a completely free distribution and one that includes closed-source kernels. The newer VAAPI driver variant from Intel which is also used by libmfx and libvpl on Linux. OneVPL is the successors of MSDK and will support more encode and decode cases. This is a library from Intel which can be installed as part of Intel oneAPI Video Processing Library (OneVPL).
The hardware can be accessed through a number of different APIs: (Each new platform supports a superset of the capabilities of the previous platform. VP9 profile 2 decode VP9, H.265 Main10 encode. "Intel Quick Sync Video" is the marketing name for a set of hardware features available inside many Intel GPUs.
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