Watermark for the user

Question

Programming

The task is to impose an individual watermark for the user when downloading content (you know why).
There are nuances:
- overlay as quickly as possible on the video file (say 5 seconds starting from the Nth)
- do not fully convert the video (an important factor is the time when uploading the video file and the resources used for the conversion)
From the manuals I read, it follows that ffmpeg and mplayer do is not able to do this.

Are there any other options for quickly applying a watermark to a video file at the time of upload?

Answer 1

www.linuxjournal.com/video/add-watermark-video-ffmpeg - here it is shown how to apply a watermark
, there are also -ss and -t parameters. they indicate the beginning and end of the fragment:
-ss 00:00:07 -t 01:00:12 - from the 7th to the 12th second,
try