JPEG XS Image (HEIF Container) MIME Type Reference

import magic
print(magic.from_file('photo.jxsi', mime=True)) # May default to generic 'image/heif' or 'application/octet-stream'

const FileType = require('file-type');
const type = await FileType.fromFile('photo.jxsi');
console.log(type?.mime); // Parsers may fail to recognize the specific 'jxsi' HEIF brand

import "net/http"
// Custom ISOBMFF box parsing is required to read the 'jxsi' brand inside the ftyp box.

$mime = mime_content_type('photo.jxsi');
echo $mime; // Standard environments typically map this to application/octet-stream