dspack, IReferenceClock and A/V sync issues with Logitech Webcams

[instinctfx]

Major a/v sync issues using Logitech webcams and directshow and dspack

Followed various MSDN methods and other peoples thinly described methods on the net and still to no avail.

Im using a logitech quick cam pro 4000 and CANNOT get the audio and video in sync. Ive tried tonnes of different methods of providing a Reference clock to keep this in sync and NOTHING has come close to working yet.

This is rather urgent for me to get this completed and its the only thing stopping me.

Oh by the way, this works fine with a Microsoft web cam but not a logitech one and its becoming rather frustrating!

All ive done for the MS cam to be in sync is

vResult := (CaptureGraph as IMediaFilter).GetSyncSource(vClock);

And the MS cam records all audio and vid in sync but not the logitech

Here is the code from the VideoCap demo application which also fails to provide syncronised content

with CaptureGraph as IcaptureGraphBuilder2 do
  begin
    // set the output filename
    SetOutputFileName(MEDIASUBTYPE_Avi, PWideChar(CapFile), multiplexer, Writer);
   

    // Connect Video preview (VideoWindow)
    if VideoSourceFilter.BaseFilter.DataLength > 0 then
      RenderStream(@PIN_CATEGORY_PREVIEW, nil, VideoSourceFilter as IBaseFilter,
        nil , VideoWindow as IBaseFilter);

    // Connect Video capture streams
    if VideoSourceFilter.FilterGraph <> nil then
      RenderStream(@PIN_CATEGORY_CAPTURE, nil, VideoSourceFilter as IBaseFilter, nil, multiplexer as IBaseFilter);

    // Connect Audio capture streams
    if AudioSourceFilter.FilterGraph <> nil then
    begin
      RenderStream(nil, nil, AudioSourceFilter as IBaseFilter, nil, multiplexer as IBaseFilter);
    end;

  end;
  
CaptureGraph.Play;

NOw this above code works fine with a microsoft web cam but directshow fails dismally on a logitech webcam.