MJP2 (.mjp2)

.mjp2 file signature | video/mj2

MJP2 is a Motion JPEG 2000 video format defined by the Joint Photographic Experts Group and standardized by ISO/IEC for storing moving images as JPEG 2000 codestreams. It is used for digital cinema, archival video, broadcast workflows, and other applications that require frame-based compression and image fidelity. The format is generally considered safe, though support is limited in some players and older implementations may be less common than more widely adopted video containers.

Safe

Magic Bytes

Offset 0


              00 00 00 0C 6A 50 20 20 0D 0A 87 0A

Sources: Apache Tika

Extension

.mjp2

MIME Type

video/mj2

Byte Offset

Risk Level

Safe

Validation Code

How to validate .mjp2 files in Python

Python

def is_mjp2(file_path: str) -> bool:
    """Check if file is a valid MJP2 by magic bytes."""
    signature = bytes([0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A])
    with open(file_path, "rb") as f:
        return f.read(12) == signature

How to validate .mjp2 files in Node.js

Node.js

function isMJP2(buffer: Buffer): boolean {
  const signature = Buffer.from([0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A]);
  return buffer.subarray(0, 12).equals(signature);
}

How to validate .mjp2 files in Go

func IsMJP2(data []byte) bool {
    signature := []byte{0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A}
    if len(data) < 12 {
        return false
    }
    return bytes.Equal(data[:12], signature)
}

API Endpoint

GET /api/v1/mjp2


              curl https://filesignature.org/api/v1/mjp2

See the full API documentation for all endpoints and parameters.

Related Formats

.mj2 .j2k .jp2 .jpc .jpf .jpg2

Frequently Asked Questions

What is a .mjp2 file?

A .mjp2 file is identified by the magic bytes 00 00 00 0C 6A 50 20 20 0D 0A 87 0A at byte offset 0. MJP2 is a Motion JPEG 2000 video format defined by the Joint Photographic Experts Group and standardized by ISO/IEC for storing moving images as JPEG 2000 codestreams. It is used for digital cinema, archival video, broadcast workflows, and other applications that require frame-based compression and image fidelity. The format is generally considered safe, though support is limited in some players and older implementations may be less common than more widely adopted video containers.

What are the magic bytes for .mjp2 files?

The magic bytes for MJP2 files are 00 00 00 0C 6A 50 20 20 0D 0A 87 0A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .mjp2 file?

To validate a .mjp2 file, read the first bytes of the file and compare them against the known magic bytes (00 00 00 0C 6A 50 20 20 0D 0A 87 0A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .mjp2 files?

The primary MIME type for .mjp2 files is video/mj2.

Is it safe to open .mjp2 files?

MJP2 (.mjp2) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.