F4V

F4V is a video file format associated with Adobe Flash Player and SWF. It is one of the two formats which together are known as Flash Video, the other being FLV. Unlike FLV, F4V is based on ISO Base Media File Format, so it is similar to MP4.

Identification
Referring to ISO Base Media File Format, F4V files have a primary brand of " ".

Presumably, they always have ASCII characters " " at offset 4.

Specifications

 * F4V/FLV Technology Center → Adobe Flash Video File Format Specification, Version 10.1

Sample files

 * http://samples.libav.org/F4V/

Links

 * Wikipedia: Flash Video