[MEncoder-users] mencoder producing bad flv?

[Steve Clark]

Hi,

I'm trying to create flv by concatenating two input .flv video files as 
follows:
mencoder.exe  -ovc lavc -lavcopts vcodec=flv  input1.flv input2.flv -o 
output.flv

I find that while the inputs are playable in a browser based plugin 
(e.g. flowplayer), the output is not. Even flvtool2 cannot recognize the 
output, although Windows Media player can.

Any ideas?
Thanks, Steve.