I texted my friend from Belarus to make sure, I'll update once I get the answer
"major_brand: mp42
user_defined_text: (compatible_brands) isommp423gp5my guess is OP had a music disc (ISOM) and used a program to rip the audio from the disc to mp4. If OP still the iso maybe we could get some answers there.
https://app.box.com/s/9erwiqjvq4xtx9hwd6xyDo you still have the original file? Perhaps some metadata on it could be useful, an exact date could be inside the metadata
Chirag966
2027 days ago
morback
2028 days ago
morback
2028 days ago