MPG4
video/mp4
Magic Bytes
Offset: 4
66 74 79 70 6D 70 34 31
MPG4 is a digital multimedia container format developed by the Moving Picture Experts Group (MPEG) as part of the ISO/IEC 14496 standard. It is primarily utilized to store digital video and audio streams, facilitating streaming over the internet and playback on compatible media players. While functionally identical to the common MP4 format, this specific file extension is a non-standard variation occasionally encountered on legacy hardware or proprietary recording software.
Validation Code
How to validate .mpg4 files in Python
Python
def is_mpg4(file_path: str) -> bool:
"""
Check if file is a valid MPG4 by magic bytes.
Signature offset: 4 bytes
"""
signature = bytes([0x66, 0x74, 0x79, 0x70, 0x6D, 0x70, 0x34, 0x31])
with open(file_path, "rb") as f:
f.seek(4)
return f.read(8) == signatureHow to validate .mpg4 files in Node.js
Node.js
function isMPG4(buffer: Buffer): boolean {
// Signature offset: 4 bytes
const signature = Buffer.from([0x66, 0x74, 0x79, 0x70, 0x6D, 0x70, 0x34, 0x31]);
if (buffer.length < 12) return false;
return buffer.subarray(4, 12).equals(signature);
}
Go
func IsMPG4(data []byte) bool {
// Signature offset: 4 bytes
signature := []byte{0x66, 0x74, 0x79, 0x70, 0x6D, 0x70, 0x34, 0x31}
if len(data) < 12 {
return false
}
return bytes.Equal(data[4:12], signature)
}API Endpoint
GET
/api/v1/mpg4
curl https://filesignature.org/api/v1/mpg4