JPEG XR Image Sequence (HEIF Container)

import magic
print(magic.from_file('burst.jxrs', mime=True)) # Will typically default to generic 'image/heif' or 'application/octet-stream'

const FileType = require('file-type');
const type = await FileType.fromFile('burst.jxrs');
console.log(type?.mime); // Standard parsers often fail to identify the precise 'jxrS' brand

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

$mime = mime_content_type('burst.jxrs');
echo $mime; // Standard systems will map this to application/octet-stream