Stretch as Deafult Please!

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To be honest I don't even know what DAR is. I'm not too clued up on all this stuff, although I am a technical, geeky type with a background in retro gaming & emulation builds etc, this is the first thing I've done in years and wanted it to be as simple as possible, which it has been with Jellyfin. My project is 99.9% done which is great, I just which this last little annoyance could be sorted to make it 100% 😆

Using a tool like mediainfo or ffprobe, you can find metadata information on SAR and DAR by default. As far as I can tell, PAR=SAR for ffmpeg tools as well as mediainfo.

• PAR (Pixel Aspect Ratio) is the width of a single pixel compared to the height in a ratio. Very important with 480i and 576i (NTSC and PAL) interlaced content, which use tall (height > width) pixels and fat pixels (width > height), respectively. For most modern, progressive scan content, this ratio is 1:1 (square pixels). Bad conversion can lead to 480i content squished
  when en/transcoded to progressive scan which might be happening in your setup. The effect is subtle.
  
• SAR (Sample Aspect Ratio) is, for all intents and purposes, the same as PAR as far as I know. I believe both mediainfo and ffprobe report SAR as pixel aspect ratio. The alternative definition, which doesn't make much sense as metadata, is the ratio of width to height in pixels, reduced to a standard value (e.g., 1.33:1 or 5:4).
  
• DAR (Display Aspect Ratio) is how media communicates the way it should be displayed. The DAR will generally be 4:3 or 16:9, but could be 5:4 for PAL/576i content or even crazier for ultra-wide aspect ratio films (think anamorphic or IMAX).