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[rikiki61]

I Inform this forum that I found the cause of my problem ...
For creating the video, the background process requires setting a variable written in the settings.ini file:

; Base URI to use for loopback requests (background processing, video creation, etc).
; This is mostly used when the pages are behind authentication and need another path
; for processing background tasks.
; local_server=http://X.X.X.X

In my case I did not notice that the line was commented (;) and there is no warning on the lack when you make the video request