.F4F File Extension
File TypeFlash Video Fragment
What is an F4F file?
Partial .FLV video file created and used by Adobe Media Server, a software application used for streaming multimedia content; contains a fragment of an overall Flash video file; used for separating larger video files into smaller segments that can be sent to client computers that stream video content.
NOTE: The PHP script AdobeHDS can be used to join F4F fragments into FLV files.