% ~/bin/ffmpeg -i VTS_01_1.VOB -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 ~/kiki.aviFFmpeg version SVN-r8857, Copyright (c) 2000-2007 Fabrice Bellard, et al.  configuration: --prefix=/home/vb --enable-liba52 --enable-gpl --enable-libmp3lame  libavutil version: 49.4.0  libavcodec version: 51.40.4  libavformat version: 51.12.1  built on Apr 29 2007 23:47:55, gcc: 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)Input #0, mpeg, from 'VTS_01_1.VOB':  Duration: 00:23:52.8, start: 0.287267, bitrate: 5995 kb/s  Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576, 8104 kb/s, 25.00 fps(r)  Stream #0.1[0x82]: Audio: ac3, 48000 Hz, 5:1, 384 kb/s  Stream #0.2[0x83]: Audio: ac3, 48000 Hz, 5:1, 384 kb/s  Stream #0.3[0x23]: Subtitle: dvdsubFile '/home/vb/kiki.avi' already exists. Overwrite ? [y/N] yOutput #0, avi, to '/home/vb/kiki.avi':  Stream #0.0: Video: mpeg4, yuv420p, 720x576, q=2-31, 800 kb/s, 25.00 fps(c)  Stream #0.1: Audio: mp2, 48000 Hz, 5:1, 64 kb/sStream mapping:  Stream #0.0 -> #0.0  Stream #0.1 -> #0.1[mp2 @ 0x8496748]encoding 6 channel(s) is not allowed in mp2Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height