F4V, Flash MP4 Video File (.f4v)
The F4V Video file format
The F4V is one among the best known Flash Video formats. It is supported by Adobe Flash Player. Files with the F4V extension are referred to as container formats. Unlike other FLV files, the F4V file format uses boxes for data storage. Leaving aside iOS Apple devices, files with the F4V extension can be played through almost all Flash supporting browsers.
Technical details of F4V files
Based on the ISO base Media File Format, this video container format was originally based on the Apple Quick Time Container Format. Unlike the old FLV format, the F4V format files flawlessly support the h.264 and ACC compressed formats forming the baseline for other container formats.