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..!


    after some tries, I've found this command is working for me:

    ffmpeg -f dshow -i video="HP Webcam" test.mp4
    

    of course I was trying to capture video using my laptop's built-in camera, but maybe the same options work for you too, in case you wanted to also specify audio input (from the source I was reading) you should use this command:

    ffmpeg -f dshow -i video="HP Webcam":audio="audio source" test.mp4
    
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