Webex Advanced Recording Format files
application/octet-stream
Magic Bytes
Offset: 0
01 00 39 30
Webex Advanced Recording Format (ARF) is a proprietary multimedia container developed by Cisco Systems for capturing online meeting sessions. These files store synchronized audio, video, desktop sharing, and interactive data such as polls and annotations, requiring the Webex Network Recording Player for native playback. This legacy format is considered safe for archival purposes, though modern Cisco deployments have largely transitioned to standard MP4 files to ensure cross-platform compatibility without proprietary software.
Validation Code
How to validate .arf files in Python
Python
def is_arf(file_path: str) -> bool:
"""Check if file is a valid ARF by magic bytes."""
signature = bytes([0x01, 0x00, 0x39, 0x30])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .arf files in Node.js
Node.js
function isARF(buffer: Buffer): boolean {
const signature = Buffer.from([0x01, 0x00, 0x39, 0x30]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsARF(data []byte) bool {
signature := []byte{0x01, 0x00, 0x39, 0x30}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/arf
curl https://filesignature.org/api/v1/arf