// Oprogramowanie Roman Ryltsov
(this is a re-post from StackOverflow) Virtual webcam is typically a software only implementation that application discover as if it is a device with physical representation. The mentioned applications use APIs to work with web cameras and ability to extend the APIs and add your own video source is the way to create a virtual…
IX509PrivateKey::Export exports key data from COM object, MSDN: strExportType [in] A BSTR value that specifies how the private key is exported. If the key was created by using a CNG KSP (Key Storage Provider), you can specify one of the values allowed by the pszBlobType parameter in the NCryptExportKey function. If the key was created…
In one of the earlier posts I mentioned a problem with registration-free COM dependency setup up by Visual Studio as a part of build process. This post is about the tool that offers an alternate solution for the problems, and also gives more: standalone, independent from build, addition/removal registration-free COM links automation of registration-free COM…
H.264 (MPEG-4 Part 10 also known as MPEG-4 AVC) video encoding was never packaged into DirectShow filter by Microsoft and instead they offered Media Foundation Transform (MFT) for the job: H.264 Video Encoder. Further development gave us third party video encoders also packaged as MFTs. Hardware backed MFTs became a part of video hardware drivers…
As I mentioned in earlier post, Media Foundation video capture capability is internally using undocumented categories with pretty much the same transforms and enumeration applicable to categories documented. Without documenting it as public contract, MFEnumDeviceSources enumerates transforms, builds standard implementation for IMFMediaSource on top of available transform and… voila! Media Foundation offers “lightweight” API for…
Just like with DirectShow video capture capability information, it is helpful to unerstand what Medfia Foudnation video capture offering is exactly. Specifically: Video and audio sources available with MFEnumDeviceSources and MFCreateDeviceSource Source attributes, streams, media types DirectShow compatible representations H.264 realated attributes in media types might be not so obvious and device might report too…