Intel Engineer Ports QuickSync Video Decoding to FFDShowby Anand Lal Shimpi on September 28, 2011 6:59 PM EST
An Intel engineer by the name of Eric Gur started an AVSForum thread indicating he had begun work on enabling Quick Sync support in FFDShow's video decoder. Quick Sync is typically known as Intel's hardware accelerated transcoding engine found in Sandy Bridge, however there are both encode and decode aspects to the engine. Gur's work focuses on the latter.
To access Intel's hardware video decode acceleration application developers typically turn to the DirectX Video Acceleration (DXVA) API. Sandy Bridge's hardware decode engine interfaces with DXVA and can return decoded frames not run on the x86 CPU cores. As we've lamented in the past, open source DXVA decoders haven't typically worked all that great for Sandy Bridge (or previous generation Intel GPUs, for that matter). FFDShow users have often avoided DXVA solutions as they can't be used with any custom post processing FFDShow filters.
Gur's Quick Sync filter for FFDShow gets around all of this. By accessing SNB's video decoder through Quick Sync, FFDShow gets full hardware acceleration by going through the Intel Media SDK and not through DXVA directly. It can also be used on non-Sandy Bridge systems, but, with higher CPU usage. The filter is obviously unsupported software but head on over to AVSForum if you're interested in checking it out. If you want more technical details check out the related thread on the Doom9 Forums.