Best H.264 settings for low bit-rate streaming video
If you are going for a lot of motion, make sure you set a higher I frame rate. An I frame is a whole frame that you are going to need with quick motion.

Also, check out this link http://www.adobe.com/devnet/flash/apps/flv_bitrate_calculator.html for some basic settings. That shows you that 150kb/s is way to slow to keep a good picture. For SD material, bitraters of around 500kb/s with fast motion is recommended.