DShow.Net Problem With Opening Camera

[BBatts]

Hello. I'm streaming a webcam using DirectShow. I can open the camera fine on a windows form once. But, If I close the camera and then try to reopen it my code fails on the RenderStream line. Once I restart my application everything is fine again. I'm quite certain I'm freeing everything up, but i'm stumped. Any help would be GREATLY appreciated.

Guid cat = PinCategory.Capture;
Guid med = MediaType.Video;

    private IBaseFilter sourceBase;
    private IGraphBuilder graph;
    private ICaptureGraphBuilder2 capGraph;
    private ISampleGrabber sg;
    private IMediaControl mc;
    private IBaseFilter grabberBase;
    private VideoInfoHeader videoInfoHeader;

    private const int WM\_GRAPHNOTIFY = 0x00008001;
    private const int WS\_CHILD = 0x40000000;
    private const int WS\_CLIPCHILDREN = 0x02000000;
    private const int WS\_CLIPSIBLINGS = 0x04000000;

    private int frameWidth = 320;
    private int frameHeight = 240;

public bool Start(string SystemID)
    {          
        using (DsDevice camDevice = GetDeviceFromMon(SystemID))
        {
            if (camDevice != null)
            {
                object comObj = null;
                Guid gbf = typeof(IBaseFilter).GUID;
                Guid clsid = Clsid.CaptureGraphBuilder2;
                Guid riid = typeof(ICaptureGraphBuilder2).GUID;

                AMMediaType media = new AMMediaType();
                media.majorType = MediaType.Video;
                media.subType = MediaSubType.RGB24;
                media.formatType = FormatType.VideoInfo;
              
                //Create Source
                camDevice.Mon.BindToObject(null, null, ref gbf, out comObj);
                sourceBase = (IBaseFilter)comObj; comObj = null;

                //Create Graph
                comObj = Activator.CreateInstance(Type.GetTypeFromCLSID(Clsid.FilterGraph));
                graph = (IGraphBuilder)comObj; comObj = null;

                //Create Capture Graph
                comObj = DsBugWO.CreateDsInstance(ref clsid, ref riid);
                capGraph = (ICaptureGraphBuilder2)comObj; comObj = null;

                //Create Grabber
                comObj = Activator.CreateInstance(Type.GetTypeFromCLSID(Clsid.SampleGrabber));
                sg = (ISampleGrabber)comObj; comObj = null;

[Simon_Whale]

What is the exception that it throws?

Every day, thousands of innocent plants are killed by vegetarians. Help end the violence EAT BACON

[BBatts]

Thanks for replying. capGraph.RenderStreamdoesn't throw an exception, but it returns -2147024809

[Simon_Whale]

http://stackoverflow.com/questions/13100698/unknown-error-on-renderstream[^] Can I suggest that you have a read of this

Every day, thousands of innocent plants are killed by vegetarians. Help end the violence EAT BACON

[BBatts]

OK. It tells me parameter is incorrect. That's the exception thrown. Which leads to believe the one of my two IBaseFilters isn't being released. But I don't see where or how.

[Lost User]

if (grabberBase != null)

Why's that there? It should not be disposed before the ReleaseComObject is called.

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]

[BBatts]

I know it's unnecessary -- it's just an old habit. Certainly not what's causing my problem though.