How do I record the sound?

Ya
2

How can I record the sound coming from the laptop with my laptop? If I run a movie on the laptop, and want to record the sound of the film?

Ka

This goes e.g. With Audacity, you can read here:

https://www.giga.de/...stereomix/

ky

For this you have to activate stereo mix first. It works like this:

If you can't activate stereo mix, you need the free VB-Cable driver that you can download here: http://vincent.burel.free.fr/VirtualAudioApps/VBCABLE_Driver_Pack43.zip Unpack the Zip and run the VBCABLE_Setup_x64.exe as administrator on Windows 64bit. For Windows 32bit, run VBCABLE_Setup.exe as administrator. The handling is like stereo mix.

Then you install Audacity: https://www.audacity.de/ Then choose the stereo source or VB cable at the sound source.