The 32-bit Windows desktop application is to be a short wizard that encapsulates a PowerPoint presentation. All computers using the application would have Windows 7 or higher and MS Office already installed. It has been suggested to us that this could be done using the DirectShow.Net library (http://directshownet.sourceforge.net/) instead of our initial idea of using FFmpeg.
The wizard should first gather a few hardware details about the screen, webcam and microphone, then show a series of dialogue boxes, that demonstrate the user's webcam and microphone and select a PPT file. The slideshow will always be 16:9 as they will come from a template we provide to users. It should then show a wrapper for a fullscreen slideshow (perhaps using a child window?) in full screen, with 16:9 showing as letterboxed on a 4:3 monitor, with basic a controls overlay on the bottom right, only allowing the user to go to the next/previous slide and start/finish recording. A background task would capture the screen and overlay the webcam input on the bottom right to obscure the user controls. The resulting composite stream would be encoded as h264+AAC@720p. (See the FFmpeg sample commands as a proof of concept.)
The executable would be packaged into a basic installer that only copies files to a folder in %ProgramFiles(x86)% (with any libraries or packaged binaries going to the same location so %PATH% is unaffected) and creates a single shortcut in the start menu. The preferences (last used folder and input devices) should be saved in a folder under %AppData%. Uninstall should simply remove these three items. An MSI is preferred.
Full source code will be required so, in future it's possible to edit and recompile.