somebody should note that dictating the bitrate DOES NOT mean the final output uses that bitrate, but instead each channel uses that, and then both channel's bitrates are ADDED UP to comprise the final output's bitrates.
If you put in 4000Kbps, the converter will encode the left channel at 4000Kbps video (+128Kbps for audio, so that makes 4128Kbps), and then the right channel at 4000Kbps, and then mux them together for 8000Kbps bitrate.
easily double your source file size (if the source file size is also using 4000Kbps bitrate). my 4GB source file became 9GB (that's the temp file, not yet split). insanely crazy, so better keep it in mind. it's usually reasonable to put in around 2000Kbps (or half of source bitrate) which adds up to 4000Kbps bitrate, which plays quite nicely (depending on the class of your microSD, could be smoother or choppier) and outputs at least around the same file size as the source.
EDIT: I'm gonna start renaming my conversions into this NNN_####, where NNN is any letter combination (acronym or first three letter) of the movie, and #### is basically the bitrate in thousands with the last two digits as the sequence. hence, AVA_6001, AVA_6002, AVA_6003 means it's the first 30 minutes of Avatar 3D encoded in 6000Kb/s. This way, I can sort of keep track of which are my budget conversions and which are my HQ ones.