Merging flv files

Hi ,
i need to merge two flv videos , i have tried using this command:

mencoder -oac copy -ovc copy -idx -o c.flv a.flv b.flv,

   the resulting file is of expected size , but somehow i am not able to play it ....

    Please let me know your thoughts

Thanks
Aprit

Hi ,
     i need to merge two flv videos , i have tried using this command:
   mencoder -oac copy -ovc copy -idx -o c.flv a.flv b.flv,

   the resulting file is of expected size , but somehow i am not
able to play it ....

    Please let me know your thoughts

That rails talk isn't the best place to discuss usage of mencoder ?

Fred