FLV Crossdomain Issue

I did a search and covered my bases before posting this - hopefully.

I can’t seem to pull an FLV file into the FLVPlayback component on our website (site A). There’s a crossdomain.xml file in place (root of site) where the FLV files are (site B) and I can call every other type of file to our website (JPG, SWF, PPT). My thinking is the mime type is not correct on site B? Could this be the case? Any other suggestions? The skin and the FLV are in the same location.

Thanks.