Re: "TUNER NOT FOUND" in MCE?
- From: Tim Roberts <timr@xxxxxxxxx>
- Date: Tue, 03 Jul 2007 21:14:04 -0700
Edward Hsu <EdwardHsu@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I am porting a AVStream driver to an video capture box (with USB)
interface. I can use GraphEdit to setup filter graph (analog tuner, TV audio
decoder, crossbar, capture and encoder filters) and play/stop correctly.
However, I failed to use it under Microsoft Media Center (both WinXP and
Vista) and I always get "TUNER NOT FOUND" error message. I have no idea about
it. Can anyone give me some hints and direction? Any comment are very
appreciated.
Congratulation; you are embarking on the single most frustrating adventure
you can go on in the capture world. Developing drivers for Media Center is
almost completely undocumented, and the odds are that you will stumble upon
the answer at random rather than find it by design.
Do you have the magic white paper from Microsoft on "Developing Video
Capture Boards for Use with the Microsoft ActiveX Video Control?" That is
the only written documentation you are likely to find, and it is critical
that you understand it. (The msvidctl.ax control is the graph building
engine for Media Center.)
Encoder problems are among the most common issues. Graph builder must be
able to build your graph *all* the way from the tuner through to the
encoder, starting from nothing other than the capture filter. Are you
absolutely convinced that works?
Does the ehrecvr service try to build your graph at all? I assume you are
spewing kernel debugger messages; you can stop and restart the service to
watch the process.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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