avconv -i test.avi -c copy -map 0:1:2 -map 0:2:1 test1.avi
avconv version 0.8.4-4:0.8.4-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  built on Nov  6 2012 16:50:25 with gcc 4.6.3
Input #0, avi, from 'test.avi':
  Metadata:
    encoder         : VirtualDubMod 1.5.4.1 (build 2178/release)
    IAS1            : Deutsch
    IAS2            : English
  Duration: 00:24:33.16, start: 0.000000, bitrate: 1418 kb/s
    Stream #0.0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 576x432 [PAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
    Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 104 kb/s
    Stream #0.2: Audio: mp3, 48000 Hz, stereo, s16, 102 kb/s
File 'test1.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to 'test1.avi':
  Metadata:
    IAS2            : English
    IAS1            : Deutsch
    ISFT            : Lavf53.21.0
    Stream #0.0: Audio: libmp3lame, 48000 Hz, stereo, 104 kb/s
    Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, 102 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press ctrl-c to stop encoding
size=   40164kB time=1473.17 bitrate= 223.3kbits/s
video:0kB audio:37277kB global headers:0kB muxing overhead 7.744574%