[flexcoders] FLV Duration

[john_69_11]

Is there an easy way to figure out the duration of an FLV thati s
being played?  I have been looking at the NetStream object and the
onMetaData event, but it seems like the FLV does not always have the
metadata set.  The FLVs I want to play are created my other people, so
there is no way to force them to add the metadata.  is there any way
to easily get around this?