How to ingest only metadata ?

[Selur]

I have tried with a mp4 and aac sound but the application is telling me that aac can’t be in this container with mp4…

aac should work fine in mp4 (does here without issues)
-> my guess is that you are doing something other than would you wrote

How to do you add only metadata to a video file, like author, copyrights, etc, bypassing audio AND video ?

No clue how you would add metadata to video while bypassing any video handling.

By the way, is there a way to not analyse the file and just bypass the video and audio stream adding directly metadata ?

You can't skip the analysis of the file, but you can skip reencoding and just adding additional meta data, by
(skipping subtitle handling here)

• settings Base->Processing->Video to passthrough
  
• settings Base->Processing->Audio to 'passthrough (all)'
  
• enabling Base->Tabs->Tagging, and setting the stuff you want in the Tag-Tab (make sure to add stuff to Tag-Queue)
  

Cu Selur