The string 0gob6gnsacjsa3vlgjkxa is likely a unique hash or internal ID generated by a server to prevent file name collisions.
The _source suffix suggests this is the original, high-resolution upload before it was compressed or transcoded into different sizes for streaming. 0gob6gnsacjsa3vlgjkxa_source.mp4
If you have this filename but cannot play it, or if you found the link and it isn't working, consider these steps: The string 0gob6gnsacjsa3vlgjkxa is likely a unique hash