FFMPEG bitrate parameter ignored

The bitrate in FFMPEG settings for my "video" content type is ignored when the video is encoded.

The whole string is:

-i @input -f flv -b 950k -acodec libmp3lame -ar 22050 -ab 64k -ac 1 @output

No matter what I enter after the "-b" parameter, I get a 200k bitrate video. (Which, I believe, is the default)