How to capture Movie(video+audio) from Capture card using Windows media encoder library?

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C#

Windows

encoding

My capture card named Pinnacle 510-USB connect with a dvdplayer. I want capture the movie into a file. Then I set the video and audio source to Pinnacle 510-USB.

SrcVid = (IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);

SrcAud = (IWMEncAudioSource)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO);
SrcAud.SetInput("Device://Pinnacle 510-USB");
SrcVid.SetInput("Device://Pinnacle 510-USB");

However to result is the movie but no sound.