Hello Tim,
thanks for your helpful answer and the explanations.
Following up on your comment on http://videocapture.sourceforge.net/
I found that there is jaraco.video, which seems to be
"a port of the VideoCapture module in pure Python using ctypes and
comtypes."
(https://github.com/jaraco/jaraco.video)
It is using a 'DirectShow.tlb' file, whatever that is, to get the
definitions into comtypes.
https://github.com/jaraco/jaraco.video/blob/master/jaraco/video/api/__init__.py#L35
https://github.com/jaraco/jaraco.video/blob/master/jaraco/video/api/objects.py#L9
If your interested, I will post my progress on SO.
Kind regards,
Joe
An "interface" in COM terms, described by an IID, is just a set of
functions declarations. It defines the things you can do with an
object, but it is not actually an object. A "CLSID", on the other
hand, defines a COM object. The CLSID doesn't tell you what the
object can do, it's just a way of creating an object. Once you have
used a CLSID to create an object, you can ask it for an interface.
So, you can't just create IID_IAMVideoProcAmp. You have to ask an
existing object for its IAMVideoProcAmp interface. You would create
your camera object, and then query the camera object for
IAMVideoProcAmp.
Creating a DirectShow graph is a multi-step process. You create a
filter graph, you add your camera to the graph, you tell the graph to
render the stream (which means it automatically fills in the other
filters), and you control it. Here is some sample code that does
this:
https://gist.github.com/dust8/3890196
This is actually more complicated than it needs to be, because it's
trying to handle TV devices with tuner and audio filters as well. You
don't need that. Once you have a device from
VideoInputDeviceCategory, you don't need the video decoder or the
audio. You can just render the graph at that point.
Alternatively, it looks like this package might be more applicable:
http://videocapture.sourceforge.net/
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