I'm wrestling with ffmpeg trying to figure out the best conversion settings for mp4 to flv. So far I'm not having any luck, though I finally found the documentation for it:
The current command I'm using:
ffmpeg -r 6 -b 28k -maxrate 28k -bufsize 1 -i infile.mp4 outfile.flv
Actually that seems to work out OK. To see the results, check out the squigs animation that my friend Randy and I created years ago. I just posted in the gallery using FlowPlayer and Kimili Flash Embed.