Capture from HDMI or whatever
 

Hello,
I would like to record videos from my desktop to get some program tutorials. Windows or Linux as operating system.
Audio may not be a big problem, as I'll add it afterwards.
With older PCs I use to capture from s-video or composite as their graphic card own. Now the older PCs are too slow for some apps and I need to use modern PCs that have not s-video or composite.
How can I capture my desktop?

Regards,
R.

Why not use screen recording software?

If you do decide you need a capture device, recommendations would depend on whether you want the ability to capture lossless (device outputs uncompressed, allowing software compression) or not (device outputs hardware-compressed).

VLC can do that