Video Recording Using FFMPEG

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C#

WinForms

Hi,

I have recording a video from cam using ffmpeg. The command is ffmpeg -f dshow -i video="":audio="" -vcodec libx264 -acodec ac3 -ac 2 -b:a 128k -ar 48000 -ab 160k OutPut
its get recording. my problem i cant able to view the video while recording itself.
after stopping the recording i can able to view the video. while recoding itself i played the video in mpc it shows cannot render the file. I want to know whether i had missed any command for this problem in ffmpeg. whether there is any command available for this problem in ffmpeg. please anybody help me, for past two day i am searching this problem thanks in advance.