20220606-6_720pmp4 -

: Refers to the High Definition (HD) resolution, which uses 720 horizontal scan lines (1280 pixels wide).

If you are looking for the specific content within a video you found, it likely belongs to a private archive, a specific workplace internal system, or a local security DVR. 20220606-6_720pmp4

: Indicates this is the sixth clip or segment in a series from that day. : Refers to the High Definition (HD) resolution,

While there is no public "official" document by this exact name, this file format is commonly associated with: a specific workplace internal system