В документации сказано:
Цитата:
onMetaData (NetStream.onMetaData handler)
onMetaData = function(infoObject:Object) {}
Invoked when the Flash Player receives descriptive information embedded in the FLV file being played.
The Flash Video Exporter utility (version 1.1 or greater) embeds a video's duration, creation date, data rates, and other information into the video file itself. Different video encoders embed different sets of metadata.
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Соответственно, выясняем какие метаданные есть в флв, и обрабатываем при загрузке.