So many users dont want to sit there and wait for it and honestly flv is not all its cracked up to be. So check the store there are a few in there. Just understand you may not get any use out of them unless its you uploading the vids yourself.
this one embeds well but does not upload but he is a great dev and does good work.
and its free http://www.oxwall.org/store/item/1042
This one uploads but does not embed and its been awhile since i have used it so im not sure if it works with current version or not. I have it but have not used it on my current install yet. http://www.oxwall.org/store/item/276
so i dont think your going to find one that does all.
What i did was i went into the video js and took out the bar and then tried an upload and just waited and timed it and it does upload, for me its about 3mb a min so a 100mb video will take about 30 to 40 min to do.
here is what mine looks like after i took out the bar, and the other buttons and it works and looks much better.
hope that helps.