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VLC player demos real-time AI subtitling for videos
(www.theverge.com)
This is a most excellent place for technology news and articles.
I get what you are saying, but I don't think there is any standardized format for these trickplay images. The same images from Plex would likely not be usable in Jellyfin without converting the metadata (e.g. to which time in the video an image belongs to). So VLC probably does not have a good way to understand trickplay images not made by VLC.