How to capture input of deltacast capture card using ffmpeg or any tool?Please help me?

Use OBS and create a scene, then create a source and select your capture card

OBS is very useful if you want to record or stream your captures

obsproject.com/

Step 1

Step 2

Step 3

Step 4

Then you click okay and your capture card should show up on screen, the rest is pretty simple to figure out.

In step 4 you configure what OBS will pickup from the capture card, it should pick up audio from the card. If you want to add a microphone to the capture so you can talk while you record or stream you go through this process again and select “Audio Input Capture” rather than “Video Capture Device”

OBS has twitch integration, if you go into settings and go to “stream” option, you can login and live stream to twitch and various other websites.