: The strings of accented characters (like зІѕжќ± ) are likely Cyrillic letters that have been mangled during a download or file transfer.
: This is a standard MPEG-4 Part 14 video container used for storing video, audio, and subtitles. How to Fix or Identify the Content
If you need to know what this video actually is, you can try the following:
: This looks like a specific internal release code , series ID , or tracking number used by the uploader or a content distribution system.
Converting "болно" to Cyrillic - Stack Overflow