Occasionally, such strings appear in system log reports or PDF documents summarizing video metadata extraction. How to Find the "Deep" Meaning or Source
The "Ð" and "Ñ" characters are characteristic of UTF-8 encoded Cyrillic text being interpreted as Windows-1252 (Latin-1) . The original filename was likely in a language like Russian or Bulgarian.
The cryptic filename is likely a result of character encoding corruption (often called mojibake), where a file originally named in one script (like Cyrillic) is incorrectly read by a system using another.