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FileVideoSource PreventFreezing stopped working

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FileVideoSource PreventFreezing stopped working

Postby azx656254 » Fri Apr 21, 2017 5:47 am

The PreventFreezing property in AForge.Video.DirectShow FileVideoSource no longer works for me and my application now stalls when the property is set. The property used to work before I did a re-installation of Windows. I took a look at the FileVideoSource source code and thought that maybe I could add the filters that Graph.Render() automatically adds, which I found using graphedt, but that didn't seem to work. Does anyone have any idea how to fix this?
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Joined: Thu Apr 20, 2017 3:23 pm

Re: FileVideoSource PreventFreezing stopped working

Postby azx656254 » Wed May 17, 2017 12:57 pm

I think that a work around for this may be to connect the Null Renderer filter to the sample grabber filter, as that seems to work for the DxScan sample included in the library. I tried to implement this but the BufferCB method was never run.

This is the code that I added to the File Video Source.
Code: Select all
                // get type for null render filter               
                type = Type.GetTypeFromCLSID(Clsid.NullRenderer);
                if (type == null)
                    throw new ApplicationException("Failed creating null renderer");

                //Create the null render filter.
                nullRenderObject = Activator.CreateInstance(type);
                nullRenderFilter = (IBaseFilter)nullRenderObject;

                // connect null renderer to grabber filter
                inPin = Tools.GetInPin(nullRenderFilter, 0);
                outPin = Tools.GetOutPin(grabberBase, 0);
                graph.Connect(outPin, inPin);

I also added the NullRenderer CsID in the Uuids class. I got this id from Graph Edit.
Code: Select all
        public static readonly Guid NullRenderer =
            new Guid(0xC1F400A4, 0x3F08, 0x11D3, 0x9F, 0x0B, 0x00, 0x60, 0x08, 0x03, 0x9E, 0x37);
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Joined: Thu Apr 20, 2017 3:23 pm

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