Re: Setting MDI parent on Form causes video not to render

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

"SmartSentry" <SmartSentry@xxxxxxxxxxxxxxxxx> wrote in message
news:ANvCf.14722$mf2.11114@xxxxxxxxxxxxxxxxxxxxxxx
> Russ
>
> Not sure if there's any earlier posting to your two below. From what you
say
> it's similar to an experience I had recently, I resolved it by using the
> VMR9 in windowless rather than windowed mode (however this appeared to
> expose other underlying problems in my code which I'm still resolving).
> Also - It appears to be an MFC form, so it's worth checking you have an
> empty WM_ERASEBKGND handler in your code.
>
> Regards
> Mike
>
> "Russ Mello" <RussMello@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:F88369A8-3688-4B22-A2EA-D0B8FF948E41@xxxxxxxxxxxxxxxx
> >
> >
> > "Russ Mello" wrote:
> >
> >> Hi All,
> >>
> >>    I have a C# form displaying the output of a VMR9 renderer that works
> >> just
> >> fine. But when I change the form to be a MDI child the video no longer
> >> renders. The filter graph is running, it just does not display. After
> >> looking
> >> at it I've found that if I do not set the MdiParent property and set
the
> >> Owner property then the video displays as it should.
> >>
> >>   Any help would be appreciated.
> >>
> >> Thanks,
> >> Russ
> >>
> >
> > Hi All,
> >
> >   I've gotten a little further in that the window handle changes after
I've
> > set up the renderer. I've changed my code to override OnHandleCreated
and
> > set
> > up the renderers video window at each change. I expected this to work
but
> > I
> > still see the same symptom of no image displayed.
> >
> >  From what I've read the VMR9 can be re-parented and that others have
MDI
> > DirectShow applications. I'm missing something but I'm not sure where to
> > go
> > at this point. Any suggestions?
> >
> > Thanks,
> > Russ

I second the motion on checking WM_ERASEBKGND. I just fixed a problem I had
with that.

Bob


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