Jellyfin via Infuse on Mac: Content Loading Error

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You'll need to share the logs from your server. You can find them in Dashboard > Logs. There are two possible types, one is a server log, the other is an ffmpeg log for when the server invokes or tries to invoke transcoding on an incompatible media file. I'd guess you have incompatible media and something not set up correctly with regards to transcoding -- either something is disabled or you have hardware acceleration enabled when you don't have the correct (or any) device available on the server.