recording live stream video from tv card using ffmpeg at window

recording live stream video from tv card using ffmpeg at window

I want to record live stream every 1 second from tv card(tv signal) using
ffmpeg in window.
first of all, to record live video from tv card, I tried below.
First I tried this.
ffmpeg -list_devices true -f dshow -i dummy
then the result is
" [dshow @ 000000000024e6fe0] DirectShow video devices
[dshow @000000000024e6fe0] "SKYTV HD USB Maxx Video Capture"
[dshow @ 000000000024e6fe0] DirectShow audio devices
[dshow @ 000000000024e6fe0] "Analog Audio In(SKYTV HD USB Ma" "
so I tried
ffmpeg -f dshow -i video="SKYTV HD USB Maxx Video Capture" -r 20 -threads
0 D://test.mkv
But it didn't work. the Error message is
"[dshow@000000000034d920] Could not run filter
video=SKYTV HD USB Maxx Video Capture: Input/output error"
I use the device called 'SKYTV HD USB Maxx Video Capture' for getting tv
signal(TV card).
The First way deosn't work, I tried different way.
ffmpeg -y -f vfwcap -i list
then the result is "
[dshow @ 00000000003fd760] Driver 0
[dshow @ 00000000003fd760] Microsoft WDM Image Capture (Win32)
[dshow @ 00000000003fd760] Version: 6.1.7601.17514 list: Input/output error
"
so I tried
ffmpeg -y -f vfwcap -r 25 -i 0 D://out.mp4
then, there is some out.mp4 file in D drive but the file is nothing. (I
think it is not TV signal)
what should i do to record live video every 1 second from tv card(tv
signal) using ffmpeg in window? And How can I set channel at
tvcard(Because I want to get tv signal, there are many channels).
Please help..!