Re: Multiple DirectShow Window problems


"Thore Karlsen [DShow MVP]" <sid@xxxxxxxx> wrote in message
news:jvpkt1liiqd8fmguknrcv6cug6pfht8qgv@xxxxxxxxxx
> On Fri, 27 Jan 2006 10:28:15 -0800, "Corey Cooper" <CoreyC at
> InnovativeDesign dot com> wrote:
>
> >> It's a way to narrow it down so you can start looking for a solution in
> >> the right place. If the problem is that the renderer is dropping the
> >> frames or telling the decompressor to drop frames then you may get away
> >> with modifying the filter to adjust the time stamps up instead of
> >> blanking them to prevent the renderer from dropping the samples, while
> >> still retaining some semblance of synchronization.
> >>
> >> Or, you can intercept quality control messages from the renderer in the
> >> filter and prevent them from reaching the decompressor (or handle them
> >> some other way), but QC is an area I don't have much experience with.
> >>
> >> I can't say for sure that this is the problem you're having, but I have
> >> seen the same thing myself. In my case I was viewing video from live
> >> sources, so a simple blanking of the time stamps was enough. Since you
> >> need to retain playback synchronization your situation is a little
> >> different.
>
> >OK, I've never written a Directshow Filter, any samples of how to write a
> >CTransInPlaceFilter anywhere? I search the SDK for TransInPlace,
InPlace,
> >in place filter, all to no avail.
>
> A CTransInPlaceFilter is very easy to write, just search for
> CTransInPlaceFilter in MSDN. There are some samples in the Platform SDK,
> but let me backtrack a bit before you do spend any time on this, because
> I think I may have misunderstood the situation:
>
> >Any ideas on my second problem, the audio gradually deteriorating?
>
> I read through your original post again, and I'm a little confused now.
> I originally thought that you were playing several files at once when
> you had your problems, but it seems like you are having problems even
> when all the other files are just paused in the background? Is that
> correct? So even when you are playing just one file, you are having
> problems?

Yes, I am never playing more than one file/graph at a time. The only reason
I have multiple graphs is because of the fast response time needed to start
the playback.

A little more info: To wrap the Directshow interfaces I'm using an example
from CodeProject that uses the VMR9, the theory being that that is a
'better' VMR than VMR7. The article is:
http://www.codeproject.com/audio/vmr9.asp
I've used this successfully for a couple of projects, and with aditional
error trapping seems stable. What I'm trying to do right now is try the
whole thing with VMR7 and see what happens.




> Btw, the answer to this question:
>
> >When I load the MPEGs, I do a sequential thing, where I send the message
> >with the file name to load, the video window creates and Renders the
graph,
> >I then set a timer for a period (it was 2 milliseconds, now to try and
> >alleviate problems it's 250 m'secs), to allow some buffers to load, then
I
> >tell it to play, set a timer again for 2 m'secs, and when I get that
timer
> >callback I tell it to Pause. That's the way I know how to get it to
pause
> >already displaying frame 0, if there's a better way, PLEASE let me know.
>
> If you just call Pause() it will show frame 0. No need for timers or
> running the graph first.

I had a problem with that a while ago (different project) using WMV's and
this solution worked to fix it, I guess I'm over complicating things.

I'm actually worried more about what I describe as the second problem, but I
brought them up in that order because I think they must be related in some
way.

Thank You So much for the fast replys, I have to be in the studio with this
on Tuesday, and we tape a week from today. This is sort of a 'failure is
not an option' situation!

Corey

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