Such files are usually hosted on third-party adult tubes or file-sharing sites rather than mainstream media platforms.
Because this refers to a specific digital file found on adult platforms or peer-to-peer networks, here is what that context usually implies: French_Casting_4.mp4
"French_Casting_4.mp4" appears to be a specific filename often associated with adult content or amateur "casting" style videos originating from French production sites. Such files are usually hosted on third-party adult
These videos typically follow a "reality" or "audition" format where a performer is interviewed before participating in adult scenes. French_Casting_4.mp4