QT
video/quicktime
Magic Bytes
Offset: 4
6D 6F 6F 76 00
The QuickTime File Format (QT) is a multimedia container developed and maintained by Apple Inc. for storing various types of synchronized media data. It primarily stores video and audio tracks, serving as the technical foundation for the more modern MP4 standard while remaining compatible with major media players. Although largely succeeded by the .mov extension and the MPEG-4 specification, this legacy format remains a secure standard for local media playback within supported software environments.
Validation Code
How to validate .qt files in Python
Python
def is_qt(file_path: str) -> bool:
"""
Check if file is a valid QT by magic bytes.
Signature offset: 4 bytes
"""
signature = bytes([0x6D, 0x6F, 0x6F, 0x76, 0x00])
with open(file_path, "rb") as f:
f.seek(4)
return f.read(5) == signatureHow to validate .qt files in Node.js
Node.js
function isQT(buffer: Buffer): boolean {
// Signature offset: 4 bytes
const signature = Buffer.from([0x6D, 0x6F, 0x6F, 0x76, 0x00]);
if (buffer.length < 9) return false;
return buffer.subarray(4, 9).equals(signature);
}
Go
func IsQT(data []byte) bool {
// Signature offset: 4 bytes
signature := []byte{0x6D, 0x6F, 0x6F, 0x76, 0x00}
if len(data) < 9 {
return false
}
return bytes.Equal(data[4:9], signature)
}API Endpoint
GET
/api/v1/qt
curl https://filesignature.org/api/v1/qt