I am using a pretty common way to capture screenshots using Direct3D and encode them in an .mp4 video.
while (true)
{
HRESULT hr = pDevice->GetFrontBufferData(0, pSurface);
//code to create and send the sample to a IMFSinkWriter
}
It works despite being painfully slow (it's only good for 15 fps or so) but there's a major problem: I have to manually calculate each sample's timestamp and video length ends up as being incorrect and dependent on CPU speed.
Is there anyway to capture screenshot using a callback after a fixed interval of time (say 30 fps), without having to use the infinite loop?
