RealMedia streaming media file
application/vnd.rn-realmedia
Magic Bytes
Offset: 0
2E 52 4D 46
RealMedia (RM) is a proprietary multimedia container format developed by RealNetworks for the delivery of streaming content over the internet. It primarily serves to encapsulate video and audio streams, often used in conjunction with RealAudio and RealVideo codecs for early online broadcasting and web-based media consumption. Although largely superseded by modern standards like MP4, the format is considered safe for playback, provided it is opened with compatible, up-to-date media software that handles legacy streams securely.
Validation Code
How to validate .rm files in Python
Python
def is_rm(file_path: str) -> bool:
"""Check if file is a valid RM by magic bytes."""
signature = bytes([0x2E, 0x52, 0x4D, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .rm files in Node.js
Node.js
function isRM(buffer: Buffer): boolean {
const signature = Buffer.from([0x2E, 0x52, 0x4D, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsRM(data []byte) bool {
signature := []byte{0x2E, 0x52, 0x4D, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/rm
curl https://filesignature.org/api/v1/rm