After reading another topic I found a solution and got the right FFMPEG file copied, the file Slim_Fishguttz mentioned
I had 2 issues:
- In Linux copying failed, probably due those permission problems florid mentions,
- in windows 10 the location was not shown at all,
I decided to fix the Windows issue
First SMB 1.0/CIFS Client need to be checked
to do that Run optionalfeatures check SMB 1.0/CFIS Sharing Support and check SMB 1.0/CIFS client
Second I needed to check Enable insecure guest logons in local computer policy
to enter local computer policy you need to enter gpedit.msc, but gpedit.msc is only available in windows enterprise edition, not in windows home. I downloaded the installation file from here: http://m.majorgeeks.com/content/page/enable_group_policy_editor_in_windows_10_home_edition.html
And now after installation:
open gpedit.msc
computer configuration > Administrative Templates > Control Panel > Network > Lanman Workstation and there Enable insecure guest logons
Reboot the pc and Rock is visible in the file manager. Copy the Ffmpeg file to Data/Codecs
Restart the nuc and all my codecs are installed.
Tnx all for the input!