How to create an un-distorted thumbnail from a 360 panorama?

Hi. I’ve made a portfolio CMS and I’ve integrated A-Frame to show 360 panoramas. I create thumbnails for regular and panorama images using mthumb, but obviously the panorama images look distorted when shown as regular, “flat” images. Are there any tools or tricks to extract an un-distorted thumbnail (a crop) from a 360 panorama? Thanks.

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