Depending on the platform these IDs belong to, follow these steps to retrieve the .mp4 file:
The long numerical strings are typical for Facebook's Graph API or CDN. Download 310273719 779341426481278 2932362785119891255 mp4
Refresh the page and play the video. Look for a request that starts to climb in "Size" (this is the video buffering). Depending on the platform these IDs belong to,