FLV File Format A Flash Video file (.FLV) consists of a short header, and then interleaved audio, video, and metadata packets. The audio and video packets are stored very similarly to those in SWF, and the metadata packets consist of AMF data. FLV Header Field Data Type Example Description Signature byte[3] “FLV” Always “FLV” Version uint8 “\x01” (1) Currently 1 for known FLV files Flags uint8 b..