MKV aspect ratio ignored

[aldrenean]

Hello, I'm running a Jellyfin server (10.8.13) on a NixOS machine, and accessing it from desktop and phone browsers (mostly Firefox but I've tested on Chromium).

I've got some video files which were ripped in the wrong aspect ratio, and I'm endeavoring to fix that. I used mkvtoolnix to alter the "display-width" track header setting: this change made the file display correctly in mpv on my desktop, but when I try to play the file through Jellyfin in my browser, it's still in the original (incorrect) aspect ratio. I tried additionally changing the "pixel-width" track header setting, with the same result.

Does anyone have any insight here? I would like to avoid transcoding all of the video files again, and the MKV header seems like the proper way to do this. Is there some setting in Jellyfin I need to change so this header setting will be respected?

Thanks!

[TheDreadPirate]

I don't know if there is another way. I had to resize the canvas for some of my content, which involves actual re-encoding.

One of my problem files before.

Code:

Stream #0:0: Video: hevc (Main), yuv420p(tv, smpte170m), 708x480 [SAR 1:1 DAR 59:40], 29.97 fps, 29.97 tbr, 1k tbn (default)

The file after.

Code:

Stream #0:0: Video: hevc (Main), yuv420p(tv, smpte170m), 632x480 [SAR 1:1 DAR 79:60], 23.98 fps, 23.98 tbr, 1k tbn (default)