Vc1 decoder on raspberry pi

Server Version#:4.74.3
Player Version# ??
I am running plex media server on raspberry pi 4. I downloaded an mp4 file to videos folder.
When I try to play I get playback error "cannot convert this item. Implementation for video decoder av1 not found. How do I get av1 decoder on my plex media server.

Plex does not yet support AV1 video (which is not the same as VC-1 video).

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