This is a "release tag" identifying the specific encoder or uploader (Ash61) and indicating that this is the second version ([v2]) of their encode, likely released to fix a technical issue found in the first version. Context on the Film
Depending on your display's technology.
A specific 3D video format where the images for the left and right eyes are stacked vertically. This effectively halves the vertical resolution of each frame but allows the file to be played on standard 3D-capable televisions and monitors using "Over-Under" mode.
