Stretch as Deafult Please!

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Do you know the SAR and DAR of your media files? Any idea whether the DAR is respected by the Firestick or the SCART? What *should* happen is that the DAR should be 4:3, tell the Firestick to play it 4:3, that is transferred to the SCART as 4:3, and voila...but there's a failure somewhere in here.

I don't know how Jellyfin handles SAR/DAR or whether ANY client respects those when using Jellyfin, but that's the reason for this metadata to exist in the first place. I'd guess the SCART doesn't assert the aspect ratio of the device on the other end (i.e., your CRT) so the Firestick assumes 16:9 and that's the signal passed on. These are all assumptions, but I'm getting out of my depth as I've never used a SCART, I'm only passingly familiar with how PAR/SAR/DAR affect video playback, and Jellyfin appears to be functioning and this is a hardware issue instead...