use c# achieve video screenshot

extractframe_source\App.ico
...................\AssemblyInfo.cs
...................\Backup\App.ico
...................\......\AssemblyInfo.cs
...................\......\FrameGrabber.cs
...................\......\FrameGrabber.csproj
...................\......\FrameGrabber.csproj.user
...................\......\FrameGrabber.sln
...................\......\FrameGrabber.suo
...................\......\GUIDS.cs
...................\......\Test\App.ico
...................\......\....\AssemblyInfo.cs
...................\......\....\Form1.cs
...................\......\....\Form1.resx
...................\......\....\Test.csproj
...................\......\....\Test.csproj.user
...................\......\Test
...................\Backup
...................\bin\Debug\Interop.DexterLib.dll
...................\...\.....\JockerSoft.Media.dll
...................\...\.....\JockerSoft.Media.pdb
...................\...\Debug
...................\...\Release\Interop.DexterLib.dll
...................\...\.......\JockerSoft.Media.dll
...................\...\Release
...................\bin
...................\FrameGrabber.cs
...................\FrameGrabber.sln
...................\FrameGrabber.suo
...................\GUIDS.cs
...................\obj\Debug\FrameGrabber.csproj.ResolveComReference.cache
...................\...\.....\Interop.DexterLib.dll
...................\...\.....\JockerSoft.Media.dll
...................\...\.....\JockerSoft.Media.pdb
...................\...\.....\TempPE
...................\...\.....\VideoCapt.csproj.ResolveComReference.cache
...................\...\.....\VideoFrame.csproj.ResolveComReference.cache
...................\...\.....\VideoFrameGrabber.csproj.ResolveComReference.cache
...................\...\Debug
...................\...\FrameGrabber.csproj.FileList.txt
...................\...\Release\FrameGrabber.csproj.ResolveComReference.cache
...................\...\.......\Interop.DexterLib.dll
...................\...\.......\JockerSoft.Media.dll
...................\...\.......\TempPE
...................\...\Release
...................\...\VideoFrameGrabber.csproj.FileList.txt
...................\obj
...................\Test\App.ico
...................\....\AssemblyInfo.cs
...................\....\bin\Debug\Interop.DexterLib.dll
...................\....\...\.....\JockerSoft.Media.dll
...................\....\...\.....\JockerSoft.Media.pdb
...................\....\...\.....\Test.exe
...................\....\...\.....\Test.pdb
...................\....\...\Debug
...................\....\...\Release\Interop.DexterLib.dll
...................\....\...\.......\JockerSoft.Media.dll
...................\....\...\.......\Test.exe
...................\....\...\.......\Test.vshost.exe
...................\....\...\Release
...................\....\bin
...................\....\Form1.cs
...................\....\Form1.resx
...................\....\obj\Debug\Jillzhang.VideoCapture.Form1.resources
...................\....\...\.....\ResolveAssemblyReference.cache
...................\....\...\.....\TempPE
...................\....\...\.....\Test.csproj.GenerateResource.Cache
...................\....\...\.....\Test.exe
...................\....\...\.....\Test.pdb
...................\....\...\Debug
...................\....\...\Release\JockerSoft.Media.Form1.resources
...................\....\...\.......\ResolveAssemblyReference.cache
...................\....\...\.......\TempPE
...................\....\...\.......\Test.csproj.GenerateResource.Cache
...................\....\...\.......\Test.exe
...................\....\...\Release
...................\....\...\Test.csproj.FileList.txt
...................\....\obj
...................\....\Test.csproj
...................\....\Test.csproj.user
...................\Test
...................\UpgradeLog.XML
...................\VedioCaptureTest\2.bmp
...................\................\App_Data
...................\................\Bin\Interop.DexterLib.dll
...................\................\...\JockerSoft.Media.dll
...................\................\...\JockerSoft.Media.pdb
...................\..

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