Comments for 6581 Useful Things

Comment on Minimizing audio capture latency in DirectShow by Angel G

Angel G — Tue, 10 Feb 2009 09:29:55 +0000

Thank you! I`ll try that

Comment on Minimizing audio capture latency in DirectShow by Synchronized preview of Composite and Line in | keyongtech

Synchronized preview of Composite and Line in | keyongtech — Sun, 18 Jan 2009 16:42:18 +0000

[...] ? >Can you refer me to a relevant sample with IAMBufferNegotiation usage? Here you go: http://sid6581.wordpress.com/2006/10…in-directshow/ — Be seeing [...]

Comment on Instantiating Directshow filters by name by 1

Tue, 01 Apr 2008 01:26:34 +0000

Thanks for the code!

Comment on Instantiating Directshow filters by name by Pekka

Pekka — Wed, 26 Mar 2008 08:37:04 +0000

Very usefull thing indeed

I wasted a lot of time until I found this.
Earlier I thought that the filter GUID is unique but it is not.
For example many filters use CLSID_AVIco as GUID.

Even GrapheditPlus generates non working code when it relies on GUIDs.
This is also a DirectShow filter problem
- it is not very good practice to use friendly name as a unique identifier of a filter –
but we seem to have no choice.

One thing I noticed when playing with filters is that many video and audio compressors
register themselves into CLSID_LegacyAmFilterCategory instead CLSID_VideoCompressorCategory
or CLSID_AudioCompressorCategory, so I made it like this:

HRESULT hr = CreateFilter(Name, Filter, FilterCategory);
// If not found from specified category use legacy category
if (!SUCCEEDED(hr))
{
hr = CreateFilter(Name, Filter, CLSID_LegacyAmFilterCategory);
if (!SUCCEEDED(hr))
{
return hr;
}
}

Comment on Minimizing audio capture latency in DirectShow by Gerwin

Gerwin — Sat, 22 Mar 2008 14:56:20 +0000

I am using the DirectShowLib.Net for a tv viewer application (C#). So I’m using preview for watching the video and I couldn’t figure out the reason of the audio latency. Your post solved the issue. Thanks!

Comment on Minimizing audio capture latency in DirectShow by sid6581

sid6581 — Sun, 17 Jun 2007 03:24:38 +0000

Try including atlbase.h before you include any DirectShow header files. If that doesn’t work, try including tchar.h before you include anything else. Without knowing which header files you include, and in which order, I’m not sure what else to try.

Comment on Minimizing audio capture latency in DirectShow by charlie

charlie — Thu, 14 Jun 2007 15:10:05 +0000

Any sugestion?
I’m in the same situatuion , my include directory have this order:

C:\Archivos de programa\Microsoft Visual Studio 8\VC\atlmfc\include
C:\Archivos de programa\Microsoft Visual Studio 8\VC\include
$(VCInstallDir)include
C:\Archivos de programa\Microsoft DirectX 9.0 SDK (February 2005)\Include
C:\Archivos de programa\Microsoft DirectX 9.0 SDK (February 2005)\Extras\DirectShow\Include
C:\Archivos de programa\Microsoft DirectX 9.0 SDK (February 2005)\Extras\DirectShow\Samples\C++\DirectShow\BaseClasses
$(VCInstallDir)PlatformSDK\include
$(FrameworkSDKDir)include

************** In my computer ************
in C:\Archivos de programa\Microsoft DirectX 9.0 SDK (February 2005)\Include

and

in C:\Archivos de programa\Microsoft Visual Studio 8\VC\include

*******************************************

first :
C:\Archivos de programa\Microsoft Visual Studio 8\VC\include

second :
C:\Archivos de programa\Microsoft DirectX 9.0 SDK (February 2005)\Include

Comment on Minimizing audio capture latency in DirectShow by Vinay Agarwal

Vinay Agarwal — Fri, 16 Mar 2007 01:54:54 +0000

Hello,

I am having difficulty compiling this example using Visual Studio 2005. As soon as I include any header that declares CComQIPtr, I get error “C1189: Need to include strsafe.h after tchar.h”. I would appreciate if you can provide exact headers included in your example. Thanks in advance.

Regards,
Vinay Agarwal