如题

lame参数:
-m <mode> (j)oint, (s)imple, (f)orce, (d)ual-mono, (m)ono (l)eft (r)ight
default is (j) or (s) depending on bitrate
joint = joins the best possible of MS and LR stereo
simple = force LR stereo on all frames
force = force MS stereo on all frames.

如果只是合并2个mp3, 这个没尝试过, 理论上可以, google一下吧