Change Video Resolution

Question

Hi at all
I want to change the resolution of my video. As far as I know this is possible with IAMStreamConfig.But all the samples I see are handling with a Webcam Input.
What about changing the resolution of a video file?
That's how I would do it, but it doesn't work
Code Snippet
Guid iid = typeof(IAMStreamConfig).GUID;
object outPin;
hr = cgb2.FindInterface(PinCategory.Capture, MediaType.Video, fileSource, iid, out obj);
DsError.ThrowExceptionForHR(hr);
IAMStreamConfig config = outPin as IAMStreamConfig;
AMMediaType mediaType;
hr = config.GetFormat(out mediaType);
DsError.ThrowExceptionForHR(hr);
try
VideoInfoHeader vih = new VideoInfoHeader();
Marshal.PtrToStructure(mediaType.formatPtr, vih);
vih.BmiHeader.Width = 640;
vih.BmiHeader.Height = 480;
finally
Marshal.ReleaseComObject(mediaType);

Answer 1

You both understood what I wanted. Yes I want to the change the video Resolution, not the display resolution!
But when you look at the DxLogo sample you will see this method:
Code Snippet
private void SetConfigParms(ICaptureGraphBuilder2 capGraph, IBaseFilter capFilter, int iFrameRate, int iWidth, int iHeight)
            int hr;
            object o;
            AMMediaType media;
            IAMStreamConfig videoStreamConfig;
            IAMVideoControl videoControl = capFilter as IAMVideoControl;
            // Find the stream config interface
            hr = capGraph.FindInterface(
                PinCategory.Capture, MediaType.Video, capFilter, typeof(IAMStreamConfig).GUID, out o );
            videoStreamConfig = o as IAMStreamConfig;
            try
                if (videoStreamConfig == null)
                    throw new Exception("Failed to get IAMStreamConfig");
                hr = videoStreamConfig.GetFormat(out media);
                DsError.ThrowExceptionForHR( hr );
                // copy out the videoinfoheader
                VideoInfoHeader v = new VideoInfoHeader();
                Marshal.PtrToStructure( media.formatPtr, v );
                // if overriding the framerate, set the frame rate
                if (iFrameRate > 0)
                    v.AvgTimePerFrame = 10000000 / iFrameRate;
                // if overriding the width, set the width
                if (iWidth > 0)
                    v.BmiHeader.Width = iWidth;
                // if overriding the Height, set the Height
                if (iHeight > 0)
                    v.BmiHeader.Height = iHeight;
                // Copy the media structure back
                Marshal.StructureToPtr( v, media.formatPtr, false );
                // Set the new format
                hr = videoStreamConfig.SetFormat( media );
                DsError.ThrowExceptionForHR( hr );
                DsUtils.FreeAMMediaType(media);
                media = null;
                // Fix upsidedown video
                if (videoControl != null)
                    VideoControlFlags pCapsFlags;
                    IPin pPin = DsFindPin.ByCategory(capFilter, PinCategory.Capture, 0);
                    hr = videoControl.GetCaps(pPin, out pCapsFlags);
                    DsError.ThrowExceptionForHR( hr );
                    if ((pCapsFlags & VideoControlFlags.FlipVertical) > 0)
                        hr = videoControl.GetMode(pPin, out pCapsFlags);
                        DsError.ThrowExceptionForHR( hr );
                        hr = videoControl.SetMode(pPin, 0);
            finally
                Marshal.ReleaseComObject(videoStreamConfig);
What do I have to do that this (also) works with a File Source?
Because this method only works with a Live Source (from webcam etc.)