Souce error on playback

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You could try refreshing the metadata for the item to see what happens, but image extracts are part of a scheduled task unless you have Jellyfin set to extract images when items are scanned in. Dashboard > Playback has options for enabling hardware decoding of codecs. One of these is MPEG, which may not be compatible with the hardware of your server, but you would need to provide info on your server, which I haven't seen in this topic. If you don't have hardware acceleration enabled, that's a moot point, as software decoding is possible regardless. If you have hardware acceleration enabled and MPEG checked in that list, try unchecking it.

I have to say that taking shots in the dark isn't going to help you resolve your issues, though. Without any logging, you're shit out of luck when you need to troubleshoot anything. There are literally no hints, clues, or evidence of what's happening. So you need to figure out how to access your logs and, if nothing is being logged, you need to figure out why. Otherwise nobody can really help you effectively and you certainly won't be able to help yourself.