This article refers to the UMID SEI in Panasonic AVC-Intra files. UMID itself is a larger concept that is beyond the current scope of this page.
Panasonic UMID is an SEI in AVC-Intra that many decoders look for.
Some documentation of it will come here whilst it is reverse engineered. Following UMID characters:
|Byte offset||Value (if any)||Comments|