[MEncoder-users] help: ffmpeg command to capture live video

[Sangeetha M]

I need to capture live video from tv tuner card on windows. I tried
command

"ffmpeg -r 25 -f vfwcap -i 0 -y output.avi", I changed -I option from
0-9 it is not working. I even tried the command 

"ffmpeg -t 10 -y -vd /dev/video0 -ad /dev/dsp -tvstd pal -r 25 -s
320x240 -f avi -vcodec mpeg4 -b 800 -g 128 -bf 2 -acodec mp3 -ab 64 -ar
44100 -benchmark output.avi"

 

It is throwing error "ffmpeg: unrecognized option '-vd'", How to solve
this problem on windows? What command should I use?