It's unlikely that there's some identifying information, but you can use ffmpeg (using the "copy" codec to avoid a re-encode) to strip metadata. It's also theoretically possible for the video to have used some stenography techniques, but that would be much harder and expensive for the video creator/publisher so I doubt that happened.
this post was submitted on 25 Oct 2023
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It's not unlikely. Watermarking is real. And they don't make it easy to strip off.
why is your username a password
Would this require specific stripping flags or is a simple
ffmpeg -i video.mkv -c:v copy -c:a copy out.mkv
enough?
The :v and :a is not needed.
ffmpeg -i video.mkv -c copy output.mkv
This will automatically copy the audio and the video without a reencode.
Use -map_metadata -1 to strip all metadata.