MP4V
video/mp4
Magic Bytes
Offset: 4
66 74 79 70 6D 70 34 31
MP4V is a digital video format defined by the Moving Picture Experts Group (MPEG) as part of the broader ISO/IEC 14496 standard. This format is primarily used to store elementary video streams or encapsulate visual data for internet streaming and digital media playback. While historically significant for early web video and portable media players, it has largely been superseded by H.264 and H.265 codecs for modern high-definition applications.
Validation Code
How to validate .mp4v files in Python
Python
def is_mp4v(file_path: str) -> bool:
"""
Check if file is a valid MP4V 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 .mp4v files in Node.js
Node.js
function isMP4V(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 IsMP4V(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/mp4v
curl https://filesignature.org/api/v1/mp4v