JPEG AI Image Sequence

import magic
# Libmagic may identify the sequence merely as a generic ISOBMFF container (e.g., 'video/mp4' or 'application/octet-stream')
print(magic.from_file('sequence.jais', mime=True))

const fs = require('fs');
// Manually detecting the JPEG AI Sequence brand in the ISOBMFF ftyp box
const buffer = Buffer.alloc(12);
const fd = fs.openSync('sequence.jais', 'r');
fs.readSync(fd, buffer, 0, 12, 0);
fs.closeSync(fd);
const isFtyp = buffer.toString('ascii', 4, 8) === 'ftyp';
const isJais = buffer.toString('ascii', 8, 12) === 'jais';
console.log(isFtyp && isJais);

import (
    "bytes"
    "net/http"
)
// Custom ISOBMFF detection for the JPEG AI Sequence brand
// func isJPEG_AI_Seq(buf []byte) bool {
//     return len(buf) > 12 && string(buf[4:8]) == "ftyp" && string(buf[8:12]) == "jais"
// }

// Standard PHP setups may default to identifying the ISOBMFF container rather than the specific image/jais MIME.
$mime = mime_content_type('sequence.jais');
echo $mime;