It looks like is a specific filename, likely from a social media platform (like Facebook, given the "fb" prefix) or a private internal database.
If you can provide a link to where the video is hosted or describe what happens in it, I'll do my best to track down the for you! mana.fb5198498.mp4
(If you can describe the content, I might be able to find the lyrics, speech, or source material.) It looks like is a specific filename, likely