If you don't have an answer here, it means that noone has the answer/ or that you are not clear in your question.
For vlc, you are totally able to log everything using the logger interface, or while launching vlc with debug mode.
Ok. My problem:
1) VLC. Windows VLC. Live web-cam video streaming. All works fine. I do know how to turn on logging in VLC.exe. Good documentation.
2) ActiveX VLC plug-in. Windows. Live web-cam video streaming. Just the same streaming params. No output. I don't know how to turn on logging in axvlc.dll. Lack of documentation.
3) If the logger interface is present in ActiveX VLC, I'll be very glad to see some ideas about it.