How to tell if a video has metatags injected

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http://unix.stackexchange.com – I've started streaming videos and it turns out that users can't seek into my videos if they don't have metatags injected. I use the flv format. I have installed yamdi and but it doesn't really seem to come with a good manual. I'm trying to write some sort of script that will inject these tags into my whole video library ( about 300 videos) but I would like to know if there is a way of determining if a video has already been injected (HowTos)