F4V
From Just Solve the File Format Problem
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.
F4V is a video file format associated with Adobe Flash Player and
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Identification
Referring to ISO Base Media File Format, F4V files have a primary brand of "f4v
".
The ASCII characters "ftypf4v
" appear near the beginning of the file, possibly always at offset 4.