Intel graphics hardware H264 MFT ProcessInput call fails after feeding few input samples, the same works fine with Nvidia hardware MFT

Question

I\'m capturing the desktop using DesktopDuplication API and converting the samples from RGBA to NV12 in GPU and feeding the same to MediaFoundation hardware H264 MFT. This w

Answer 1

As mentioned in the post, the error MEError ("Unspecified error") was returned by Transform's Event generator immediately after feeding the first input sample on Intel hardware, and, further calls just returned "Transform Need more input", but no output was produced. The same code worked fine on Nvidia machines though. After experimenting and researching a lot, I figured out that I was creating too many instances of D3d11Device, In my case, I created 2 to 3 devices for Capturing, color conversion, and Hardware encoder respectively. Whereas, I could simply have reused a single D3dDevice instance. Creating multiple D3d11Device instances might work on high-end machines though. This is not documented anywhere. I was unable to find even a clue for the causes of the "MEError" error. It's mentioned nowhere. There were many StackOverflow threads similar to this kept unanswered, even Microsoft people were unable to point out the problem, given the complete source code.

Reusing the D3D11Device instance solved the problem. Posting this solution as it might be helpful for people who face the same issue as mine.