FLV files can contain a SCRIPTDATA tag named onMetadata, documented in section E.5 of the FLV and F4V specification []. Beginning in Flash version 10, FLV files can also contain XMP metadata. Refer to the above XMP metadata format mapping table for more details. Technical metadata should be taken from the onMetadata tag according to the table below.

MAWG	Relation	Flash (FLV)	How to do the mapping	Datatype	XPath	Tested
Descriptive Properties (Core Set)
Identification
identifier		N/A			N/A
Content description
description		N/A			N/A
Technical Properties
frameSize	exact	The width and height fields from the onMetadata tag. The units are always pixels.		DOUBLE, 64-bit IEEE float	N/A
compression		Not directly represented. Implicit in the audiocodecid and videocodecid fields from the onMetadata tag.			N/A
duration	exact	The duration field from the onMetadata tag. The unit is always seconds.		DOUBLE, 64-bit IEEE float	N/A
format	exact	video/x-flv	static	MIME type	N/A
samplingRate	exact	The audiosamplerate field from the onMetadata tag. The unit is always samples per second.		DOUBLE, 64-bit IEEE float	N/A
frameRate	exact	The framerate field from the onMetadata tag. The unit is always frames per second.		DOUBLE, 64-bit IEEE float	N/A
averageBitRate	exact	The sum of the audiodatarate and videodatarate fields from the onMetadata tag. The units are always kilobits per second.		DOUBLE, 64-bit IEEE float	N/A
numTracks	exact	FLV files contain at most 1 audio track and at most 1 video track. There are 1-bit flags in the FLV header telling if audio or video are present.			N/A