VideoRendererElement Forum Rss Feed

New Post: crashed in .Net 4.0

romanminyaylov — Mon, 25 Jun 2012 16:51:02 GMT

I've changed target framework to 4.0, recompile it, and, got exceptions...

Any ideas?

New Post: Selecting the right webcam resolution

SvenWS — Tue, 06 Sep 2011 07:44:29 GMT

I was wondering why the capturedevice class of the sample only works with 640x480 resolution of connected webcams. I found that overwriting the BMIHeader of the VideoStreamConfig structure of the media format you from GetFormat is not working. So I extended the SetConfigParms method in following way: Instead of using GetFormat to retriev the media structure I enum all possible formats (VideoStreamConfig.GetNumberOfCapabilities and VideoStreamConfig.GetStreamCaps), select the media format I want to use and write this structure back.

Here is the method extended SetConfigParms (sorry I translated the whole class to vb.net)

    ' Set the Framerate, and video size
    Private Sub SetConfigParms(ByVal capGraph As ICaptureGraphBuilder2, ByVal capFilter As IBaseFilter, ByVal iFrameRate As Integer, ByVal iWidth As Integer, ByVal iHeight As Integer)
        Dim hr As Integer
        Dim o As Object
        Dim media As AMMediaType
        Dim FoundFormat As Boolean
        ' Find the stream config interface
        hr = capGraph.FindInterface(PinCategory.Capture, MediaType.Video, capFilter, GetType(IAMStreamConfig).GUID, o)
        Dim videoStreamConfig As IAMStreamConfig = CType(o, IAMStreamConfig)

        If (videoStreamConfig Is Nothing) Then
            Throw New Exception("Failed to get IAMStreamConfig")
        End If


        Dim iCount As Integer = 0, iSize As Integer = 0
        videoStreamConfig.GetNumberOfCapabilities(iCount, iSize)
        Dim pmtConfig As New AMMediaType
        For iFormat As Integer = 0 To iCount - 1
            Dim scc As New VideoStreamConfigCaps, pScc As IntPtr = Marshal.AllocHGlobal(Marshal.SizeOf(scc))

            hr = videoStreamConfig.GetStreamCaps(iFormat, pmtConfig, pScc)
            DsError.ThrowExceptionForHR(hr)
            Marshal.PtrToStructure(pScc, scc)

            '' copy out the videoinfoheader
            Dim header As VideoInfoHeader = New VideoInfoHeader
            Marshal.PtrToStructure(pmtConfig.formatPtr, header)

            ''Examine the format, and possibly use it. 
            If pmtConfig.subType = MediaSubType.RGB24 Then
                Debug.Print("iFormat: " & header.BmiHeader.Width & "x" & header.BmiHeader.Height)
                If header.BmiHeader.Width = iWidth And header.BmiHeader.Height = iHeight Then
                    If (iFrameRate > 0) Then
                        'header.AvgTimePerFrame = (10000000 / iFrameRate)
                    End If
                    hr = videoStreamConfig.SetFormat(pmtConfig)
                    DsError.ThrowExceptionForHR(hr)
                    FoundFormat = True
                End If
            End If

            ''Delete the media type when you are done.
            Marshal.DestroyStructure(pScc, GetType(VideoStreamConfigCaps))
            Marshal.DestroyStructure(pmtConfig.formatPtr, GetType(VideoInfoHeader))
            DsUtils.FreeAMMediaType(pmtConfig)
            pmtConfig = Nothing
            header = Nothing
            scc = Nothing

        Next

        If Not FoundFormat Then
            ' Get the existing format block
            hr = videoStreamConfig.GetFormat(media)
            DsError.ThrowExceptionForHR(hr)
            ' copy out the videoinfoheader
            Dim v As VideoInfoHeader = New VideoInfoHeader
            Marshal.PtrToStructure(media.formatPtr, v)
            ' if overriding the framerate, set the frame rate
            If (iFrameRate > 0) Then
                v.AvgTimePerFrame = (10000000 / iFrameRate)
            End If
            ' if overriding the width, set the width
            If (iWidth > 0) Then
                v.BmiHeader.Width = iWidth
            End If
            ' if overriding the Height, set the Height
            If (iHeight > 0) Then
                v.BmiHeader.Height = iHeight
            End If
            ' 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 = Nothing
        End If
    End Sub

Whith that enum it's also very easy to examin the possible resolutions of a webcam.

SvenWS

New Post: Compatibility problems

laci37 — Mon, 08 Aug 2011 18:29:34 GMT

I have successfully registered the .ax file both on my netbook(Win7 Starter) and my desktop machine (Win7 Ultimate), but the VideoRendererElement refuses to work on my netbook. What could be the problem?

New Post: Playing videos in sync

makuat — Mon, 03 Jan 2011 17:09:03 GMT

Hi,

I have the following requirement: there are 3 videos which have to be played synchronously. (e.g a classical concert with 3 perspectives for conductor, orchestra and soloist)

With the default WPF MedialElement it seems this is not possible to be in sync.

So my question: is it possible to achieve this with "VideoRendererElement"? Does anybody know a solution for my problem?

Any help would be welcome.

TIA

Regards

Martin

New Post: Problem loading the designer

eileenkho — Sat, 11 Sep 2010 02:02:48 GMT

Dear all,

I have a problem loading the designer due to assembly 'VideoRendererElement' was not found. Any suggestion on how to solve that?

Besides, I wonder how can I make the live images without reflection? I am not good in programming, but I guess is changing the pixel accessed. I will be grateful if there is a guide or advice on how I can achieve that.

Any suggestions are welcomed. Thank you in advance.

New Post: Image capture of video

sevententh — Wed, 11 Aug 2010 08:38:15 GMT

Hi,

Is it possible to capture an image of the live video stream?

New Post: Image caption of video

sevententh — Wed, 11 Aug 2010 08:37:46 GMT

Hi,

Is it possible to capture an image of the live video stream?

New Post: Internet connection required?

jgarrets — Tue, 04 May 2010 16:44:31 GMT

It seems that the VideoRendererElement won't initialize properly if my computer does not have an internet connection. It just quietly fails (no exceptions or anything) and the RendererInitialized event never occurs. Has anyone else seen this?! Does it have to do with the online XAML schemas or something? We need to deploy our application on offline computers...what do I do?

New Post: MPEG-2 on VideoRendererElement

wookie_rookie — Fri, 09 Apr 2010 18:37:05 GMT

Hi,

i have an MPEG-2 Demux and MPEG-2 Decoder in my Graph.

[DVB Source] --> [Demux] --> [Decoder] --> [Video Renderer]

Any idea how to put my SampleGrabber between decoder and renderer?

Or any other idea how to render this graph onto the VideoRenderElement?

Decoder output type is DXVA and SampleGrabber cannot connect.

I would be grateful for any ideas..

New Post: Deployment

jgarrets3 — Thu, 03 Sep 2009 16:03:28 GMT

This seems to work:

                Assembly assembly = Assembly.GetExecutingAssembly();
                Stream stream = assembly.GetManifestResourceStream("MyApp.Resources.DShowMediaBridge.ax"); // or whatever
                BinaryReader br = new BinaryReader(stream);
                string destPath = AppDomain.CurrentDomain.BaseDirectory + "\\DShowMediaBridge.ax";
                FileStream fs = new FileStream(destPath, FileMode.Create);
                BinaryWriter bw = new BinaryWriter(fs);
                byte[] ba = new byte[stream.Length];
                stream.Read(ba, 0, ba.Length);
                bw.Write(ba);
                br.Close();
                bw.Close();
                fs.Close();
                stream.Close();
                Process.Start("regsvr32.exe", "/s " + "DShowMediaBridge.ax"); // register dll silently'




Basically, I add the .ax file as a resource in my project with a build action of "Embedded Resource."  The above code pulls it out of the assembly at run-time, writes it to disk, and then registers it with regsvr32.
I run this "on-load" and it seems to be working.

Anybody know what to do about the "tearing" effects and the line of "noise" along the bottom of the video?  Is anybody else seeing that?

New Post: Deployment

jgarrets3 — Mon, 31 Aug 2009 15:55:50 GMT

If I deploy an application that used VideoRendererElement, will the end-user have to do the "register DShowMediaBridge.ax with regsvr32" thing? That wouldn't be cool...

New Post: Lib not work and Example

soulkata — Wed, 12 Aug 2009 18:27:31 GMT

Install Windows Media Player 11, its an issue of MediaElement, of the WPF!

New Post: Lib not work and Example

jgarrets — Mon, 12 Jan 2009 16:17:41 GMT

I'm having the same issue. Did you ever find the problem?

New Post: Possible to use with Windows Media Encoder?

loraderon — Fri, 12 Dec 2008 13:28:56 GMT

Hi!

I wonder if it's possible to use this code to be able to preview a capture using wme?

For additional information see: http://stackoverflow.com/questions/280604/how-do-i-preview-a-windows-media-encoder-session-in-wpf

Thanks

New Post: Lib not work and Example

bernex — Wed, 26 Nov 2008 11:56:21 GMT

I "register DShowMediaBridge.ax with regsvr32"

WinXP Sp3 - .net 3.5 sp1 - vs 2008

BUT example not work(black panel in window) ((( Why?

New Post: Does anyone saw a working example of Video Files or DVDs?

jackdan0921 — Sat, 25 Oct 2008 04:27:32 GMT

So is anybody going to answer any of these Discussions?

Well with that in mind I also would like an example of playing a video file using the VideoRendererElement.

Thanks,
Dan

New Post: Copy Web Cam Output

maloney1 — Mon, 29 Sep 2008 04:55:05 GMT

I like this project alot, but only have dug around in it lightly. My goal is to take the output of a web cam and send it to a Web service that will return it as a byte[] to a completely different listener application. I don't fully understand how to retrieve the output from the IntPtr and send it to a method on a ASP web service.

Can you help me understand how to copy the output to a method parameter on a web service? What are the conversion specifics about the output of the webcam through VideoRendererElements?

Thanks in advance.

John Maloney

New Post: Needed Prerequistes

mpg — Sat, 30 Aug 2008 21:40:15 GMT

Hmmm...

And after some futzing to get strmbase.lib in place, I've got everything building cleanly from scratch -- I think -- but now I'm getting a System.Deployment.Application.InvalidDeploymentException from m_mediaElement.Play(). The prebuilt binary does work for me, though, so it's clearly a misconfiguration somewhere in my code...

-mpg

New Post: Needed Prerequistes

mpg — Sat, 30 Aug 2008 21:08:16 GMT

Hmm.

At least on my system, I needed to put the includes jmorrill refers to in this order:

C:\Program Files\Microsoft SDKs\Windows\v6.0\Samples\Multimedia\DirectShow\BaseClasses
C:\Program Files\Microsoft SDKs\Windows\v6.0\Include

If they're switched, you can get the wrong Schedule.h....

-mpg

New Post: Simple Webcam Sample?

jameschi — Wed, 27 Aug 2008 17:33:58 GMT

I'm trying to get a simple sample to work with the latest source code and can't get one working. Can someone post a simple sample code of VRE working with a webcam connected? The sample project included keeps throwing a generic error of ComException "-2147467259" on line 147 of CaptureDevice.cs that I've tried to figure out for hours now....

Thanks,
James