How to write an own capture filter?

问题:

Here's a great article on capturing video: http://nerdlogger.com/2011/11/03/stream-your-windows-desktop-using-ffmpeg/ it uses UScreenCapture filter. This time I need to use a custom filter, how to write one? And how to register so that FFmpeg can see that?

回答1:

ffmpeg uses DirectShow video capture devices available in the opreating system, see more details on this forum thread: DirectShow Capture support.

So you need to make a counterpart virtual source device to be picked up by ffmpeg. Your resources are:

• Multiple SO topics - Virtual webcam input as byte stream
• Windows SDK - PushSource samples
• VCam sample - Capture Source Filter

回答2:

Here's an open source one [if you want to go the dshow route] https://github.com/rdp/screen-capture-recorder-to-video-windows-free Another option would be some type of custom input filter to libav [ffmpeg].

You register it by [in administrator console] regsvr32 dll_name.dll