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Ptr To Structure(media.format Ptr, v) ' if overriding the framerate, set the frame rate If (i Frame Rate 0) Then v. Height = i Height End If ' Copy the media structure back Marshal. Free AMMedia Type(media) media = Nothing ' Fix upsidedown video If (Not video Control Is Nothing) Then Dim p Caps Flags As Video Control Flags Dim p Pin As IPin = Ds Find Pin. Collect() End Sub ' Function Sample CB(By Val Sample Time As Double, By Val p Sample As IMedia Sample) As Integer Implements ISample Grabber CB. Buffer CB Sync Lock Me If (Not m_bmd Logo Is Nothing) Then Dim ip Source As Int Ptr = m_bmd Logo. Height 1) Return my Bmp End Function '**************************************************************************** 'While the underlying libraries are covered by LGPL, this sample is released 'as public domain. Dispose Close Interfaces() If (Not m_Bitmap Is Nothing) Then m_Bitmap. Public Sub Pause() If (m_b Running) Then Dim hr As Integer = m_media Ctrl. Throw Exception For HR(hr) m_b Running = False End If End Sub 'Added by jk Public Sub Take Picture() m_take Picture=True End Sub ' 0) Then m_Bitmap = New Bitmap(file Name) Dim r As Rectangle = New Rectangle(0, 0, m_Bitmap. Throw Exception For HR(hr) ' Add the video device hr = m_graph Builder. Release Com Object(cap Filter) cap Filter = Nothing End If If (Not samp Grabber Is Nothing) Then Marshal. Ptr To Structure(media.format Ptr, v Info Header) m_video Width = v Info Header. That is probably suboptimal for a webcam stream, so it would rule out 1 or 2 ( Here's a short example of working with images of a webcam video stream in C# and Direct Show using Sample Grabber: you need is to get data in suitable format (RGB24 or RGB32, not YUY2) either by setting it as preferred format of sample grabber or converting the data as you receive it. GUID, o) video Stream Config = Direct Cast(o, IAMStream Config) Try If (video Stream Config Is Nothing) Then Throw New Exception("Failed to get IAMStream Config") End If ' Get the existing format block hr = video Stream Config. Throw Exception For HR(hr) ' copy out the videoinfoheader Dim v As Video Info Header = New Video Info Header() Marshal. Release Com Object(m_graph Builder) m_graph Builder = Nothing End If GC. Release Com Object(p Sample) Return 0 End Function ' Function Buffer CB(By Val Sample Time As Double, By Val p Buffer As Int Ptr, By Val Buffer Len As Integer) As Integer Implements ISample Grabber CB. ") End If Dim dev As Ds Device = cap Devices(i Device Num) Try ' Set up the capture graph Setup Graph(dev, i Frame Rate, i Width, i Height) Catch Dispose() If unsupported Video then msgbox("This video resolution isn't supported by the camera - please choose a different resolution.") Else Throw End If End Try End Sub ' Public Sub Dispose() Implements IDisposable. Set Filtergraph(Direct Cast(m_graph Builder, IGraph Builder)) Ds Error. Throw Exception For HR(hr) 'Set window location - this was necessary so that the video didn't move down and to the right when you pushed the start/stop button hr = video Window. Release Com Object(mux Filter) mux Filter = Nothing End If If (Not cap Filter Is Nothing) Then Marshal. Zero))) Then Throw New Not Supported Exception("Unknown Grabber Media Format") End If ' Grab the size info Dim v Info Header As Video Info Header = New Video Info Header() Marshal. ) and then c) Getting snapshots One other detail about frame caps is that SOME filters require the graph to be paused in order to capture. Frame capture depends very much on the filter being used.

Basically, I would like to know how to do two things: '**************************************************************************** 'While the underlying libraries are covered by LGPL, this sample is released 'as public domain. Dispose Close Interfaces() If (Not m_Bitmap Is Nothing) Then m_Bitmap. Public Sub Pause() If (m_b Running) Then Dim hr As Integer = m_media Ctrl. Throw Exception For HR(hr) m_b Running = False End If End Sub ' 0) Then m_Bitmap = New Bitmap(file Name) Dim r As Rectangle = New Rectangle(0, 0, m_Bitmap. Throw Exception For HR(hr) ' Add the video device hr = m_graph Builder. Release Com Object(samp Grabber) samp Grabber = Nothing End If End Try End Sub ' Private Sub Save Size Info(By Val samp Grabber As ISample Grabber) Dim hr As Integer ' Get the media type from the Sample Grabber Dim media As AMMedia Type = New AMMedia Type() hr = samp Grabber. Throw Exception For HR(hr) If (Not (media.format Type. Copy(pbuf, buf, 0, my Len) for i = 0 to my Len-1 step 2 buf(i) = (255 - buf(i)) Next i Dim g_Row Size Bytes As Integer Dim g_Pix Bytes() As Byte Dim bm As Bitmap = Nothing Dim m_Bitmap Data As Bitmap Data = Nothing Dim bounds As Rectangle = New Rectangle(0, 0, m_video Width, m_video Height) mytest = "Execution point #2" m_Bitmap Data = bm. I added a cropbox to choose what portion of that picture box you would ultimately like to save, but am not including that in this answer for simplicities sake. Text = "Picture Taken." The scaleimage function simply scales the snapshot image to the appropriate size for the box I have on the form. Get Pointer(pbuf) = 0 AND mylen 0 then dim buf As byte()= new byte(my Len) Marshal. I take the picture and display that stillshot image as another picturebox on the main form (a little larger). FPS matters because the higher this nubmer is the more life-like and real the resulting video looks.We are used to seeing movies in the cinema and TV shows displayed at around 24-30 FPS.

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Stop() m_media Ctrl = Nothing m_b Running = False End If Catch ex As Exception Debug. Video, cap Filter, base Grab Flt, mux Filter) Ds Error. MOST return bitmap data NOT a bitmap and with some the image is upside down, so the data has to be transferred to a managed bitmap (MUCH faster in C#) and then rotated depending on the filter used.