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date: Tue, 1 Jul 2008 14:15:21 -0700,
group: microsoft.public.windowsmedia.sdk
back
Re: Memory leak with WMP OCX
From: "MNGoldenEagle"
> I'm using the Windows Media Player OCX control in one of
> my applications which has to handle a large number of
> audio files sequentially without using up too much
> memory. I call the Close() function each time I am
> finished with a file, but as the program progresses I see
> its VM usage shoot past 1GB after opening only ten or
> twelve wave files! Does anyone have any idea why this is
> happening and what I can do to fix it?
> Here's a code transcript (it's in PB, but it's similar
> enough to VB to be understandable, hopefully):
Unless you need some specific feature of WMP (DRM, effects,
visualizations...), why don't you just use what WMP uses
internally, that is DirectShow? Basic DirectShow tasks like
file playback can be accomplished through its automation
interface and, if you can use WMP's automation interface
(OCX), you should be able to use DirectShow's even more
easily:
http://msdn.microsoft.com/en-us/library/ms787852(VS.85).aspx
--
// Alessandro Angeli
// MVP :: DirectShow / MediaFoundation
// mvpnews at riseoftheants dot com
// http://www.riseoftheants.com/mmx/faq.htm
date: Tue, 1 Jul 2008 17:44:59 -0400
author: Alessandro Angeli
Re: Memory leak with WMP OCX
Well, I tried using DirectShow, but in order for it to work properly with PB
I need to use the OLE interface, and from what I could find in the Windows
Registry, none of the Quartz.dll records had any ProgIDs that I could use to
link to them. I can't seem to find any other means of accessing these except
via ProgIDs, and I've tried registering the DLL numerous times to no effect.
If I attempt to use the "ActiveMovieControl" object, it spawns a WMP 6 OCX,
which isn't what I want. Is there a way to set up DirectShow so that its
components have ProgIDs I can use? Otherwise, I have no choice but to use
WMP, which currently eats up 1GB of virtual memory after opening roughly ten
wave files.
"Alessandro Angeli" wrote:
> Unless you need some specific feature of WMP (DRM, effects,
> visualizations...), why don't you just use what WMP uses
> internally, that is DirectShow? Basic DirectShow tasks like
> file playback can be accomplished through its automation
> interface and, if you can use WMP's automation interface
> (OCX), you should be able to use DirectShow's even more
> easily:
>
> http://msdn.microsoft.com/en-us/library/ms787852(VS.85).aspx
date: Thu, 3 Jul 2008 12:34:03 -0700
author: MNGoldenEagle
Re: Memory leak with WMP OCX
From: "MNGoldenEagle"
> Well, I tried using DirectShow, but in order for it to
> work properly with PB I need to use the OLE interface,
> and from what I could find in the Windows Registry, none
> of the Quartz.dll records had any ProgIDs that I could
> use to link to them. I can't seem to find any other
> means of accessing these except via ProgIDs, and I've
> tried registering the DLL numerous times to no effect. If
> I attempt to use the "ActiveMovieControl" object, it
> spawns a WMP 6 OCX, which isn't what I want. Is there a
> way to set up DirectShow so that its components have
> ProgIDs I can use? Otherwise, I have no choice but to
> use WMP, which currently eats up 1GB of virtual memory
> after opening roughly ten wave files.
The documentation for PowerBuilder's
OLEObject.ConnectToNewObject() (if that's what you're using)
says that you can use a CLSID instead of a ProgID.
Have you tried the FilgraphManager's CLSID?
{E436EBB3-524F-11CE-9F53-0020AF0BA770}
Otherwise you can just add a ProgID to the registry
yourself:
[HKCR\MNGoldenEagle.FilterGraph\CLSID]
@="{E436EBB3-524F-11CE-9F53-0020AF0BA770}"
--
// Alessandro Angeli
// MVP :: DirectShow / MediaFoundation
// mvpnews at riseoftheants dot com
// http://www.riseoftheants.com/mmx/faq.htm
date: Thu, 3 Jul 2008 16:05:11 -0400
author: Alessandro Angeli
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