Re: Confusing message from GraphEdit

Tech-Archive recommends: Fix windows errors by optimizing your registry

Thanks a lot! I will dig deeper.

Taras

"Geraint Davies" <geraintd@xxxxxxxxxx> wrote in message
news:2em1djyfggf1$.xx7hdgh04hu5$.dlg@xxxxxxxxxxxxx
On Mon, 20 Nov 2006 12:29:32 +0300, Taras P. Galchenko wrote:

Hello everybody!

I am facing a strange behaviour of GraphEdit while trying to stop the
graph
with my filter.

From GraphEdit I press Run and Pause - works fine. But when I try to stop
it
says "GraphEdit cannot complete pause within 10 seconds..." although it
takes it less than a second to display such message, it does not wait for
10
seconds at all!

I've overriden Pause and Stop methods in my filter to see if they are
called
when I press Stop, but they are not called. I've written a sample program
that builds the graph and issues Run, Pause and Stop commands via
IMediaControl - they work without problems! Definitely the problem is not
about Pause or Stop and the error message of GraphEdit is confusing.

The only problem I found in my sample program is calling GetState never
returned S_OK, it always returns E_FAIL. Why? What does GraphEdit do
inside?
Why does it displays such a confusing message without an attempt to pause
or
to stop the graph?

Taras

When you press stop, graphedt pauses the graph to allow the renderer to
capture a poster frame. If the graph is seekable, it will then rewind to
0.
Then it waits for the pause to complete before stopping the graph.

The pause is complete when GetState returns S_OK after a pause call -- it
is not waiting for the Pause method to return; it is waiting for the pause
state transition to complete. Typically, the renderer will not return S_OK
from GetState until it has received some data -- this allows the graph to
be cued correctly before playback starts, and also allows the app to know
that a poster frame has been shown.

So in your case, graphedt is waiting for GetState to return S_OK. In the
meantime, it is expecting to see VFW_S_STATE_INTERMEDIATE. It actually
gets
E_FAIL, and this triggers some incorrect error handling as you reported.
So
your next step is to work out which filter returned E_FAIL from GetState,
and why.

G


.

Relevant Pages

  • Confusing message from GraphEdit
    ... I am facing a strange behaviour of GraphEdit while trying to stop the graph ... I've overriden Pause and Stop methods in my filter to see if they are called ...
    (microsoft.public.win32.programmer.directx.video)
  • Re: Confusing message from GraphEdit
    ... Here is the description of my graph: ... The last filter is the recompiled Minimal Null-Null transform in place ... The dialog that GraphEdit displays offers two options: ... From GraphEdit I press Run and Pause - works fine. ...
    (microsoft.public.win32.programmer.directx.video)
  • Re: WMR9, dual-screen, EC_PAUSED and delay in video playback
    ... graph, the filter graph manager first pauses the graph, if ... filter chain. ... In case anybody else is having the same problem, I've overriden the Pause, ... the renderer somehow cancels the first pause but I'd need to do some more ...
    (microsoft.public.win32.programmer.directx.video)
  • Re: Confusing message from GraphEdit
    ... I am facing a strange behaviour of GraphEdit while trying to stop the graph ... From GraphEdit I press Run and Pause - works fine. ... The pause is complete when GetState returns S_OK after a pause call -- it ...
    (microsoft.public.win32.programmer.directx.video)
  • Re: Confusing message from GraphEdit
    ... GetState to the filter graph I walked thru the list of the filters and asked ... From GraphEdit I press Run and Pause - works fine. ...
    (microsoft.public.win32.programmer.directx.video)