[Libav-user] How to encode several audio tracks into one file ?

[pehache]

Hi,

I'm trying to convert a .mp4 file which contains 2 audio tracks to a 
.mkv file, keeping the 2 tracks. I thought that using -map would be 
enough, but clearly it isn't :

=================================================================
*****$ ffmpeg -i Good_Bye_Lenin.DVDRIP.HQ.deFR.mp4 -vcodec copy -acodec 
copy -map 0.0 -map 0.1 -map 0.2 toto.mkv
ffmpeg version 0.7.11, Copyright (c) 2000-2011 the FFmpeg developers
   built on Mar 17 2012 12:11:52 with gcc 4.2.1 (Apple Inc. build 5666) 
(dot 3)
   configuration: --prefix=/opt/local --enable-gpl --enable-postproc 
--enable-swscale --enable-avfilter --enable-libmp3lame 
--enable-libvorbis --enable-libtheora --enable-libdirac 
--enable-libschroedinger --enable-libopenjpeg --enable-libxvid 
--enable-libx264 --enable-libvpx --enable-libspeex 
--mandir=/opt/local/share/man --enable-shared --enable-pthreads 
--cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm
   libavutil    50. 43. 0 / 50. 43. 0
   libavcodec   52.123. 0 / 52.123. 0
   libavformat  52.111. 0 / 52.111. 0
   libavdevice  52.  5. 0 / 52.  5. 0
   libavfilter   1. 80. 0 /  1. 80. 0
   libswscale    0. 14. 1 /  0. 14. 1
   libpostproc  51.  2. 0 / 51.  2. 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x102052000] max_analyze_duration 5000000 
reached at 5013333

Seems stream 0 codec frame rate differs from container frame rate: 
180000.00 (180000/1) -> 25.00 (25/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Good_Bye_Lenin.DVDRIP.HQ.deFR.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isomavc1
     creation_time   : 2012-04-07 09:59:01
     encoder         : HandBrake 0.9.6 2012022800
   Duration: 01:52:41.32, start: 0.000000, bitrate: 1274 kb/s
...
     Stream #0.0(und): Video: h264 (High), yuv420p, 704x384, 999 kb/s, 
25 fps, 25 tbr, 90k tbn, 180k tbc
     Metadata:
       creation_time   : 2012-04-07 09:59:01
     Stream #0.1(fra): Audio: aac, 48000 Hz, stereo, s16, 131 kb/s
     Metadata:
       creation_time   : 2012-04-07 09:59:01
     Stream #0.2(deu): Audio: aac, 48000 Hz, stereo, s16, 131 kb/s
     Metadata:
       creation_time   : 2012-04-07 09:59:01
     Stream #0.3(fra): Subtitle: dvdsub, 4 kb/s
     Metadata:
       creation_time   : 2012-04-07 09:59:01
     Stream #0.4(und): Subtitle: text / 0x74786574
     Metadata:
       creation_time   : 2012-04-07 09:59:01
File 'toto.mkv' already exists. Overwrite ? [y/N] y
Output #0, matroska, to 'toto.mkv':
     Stream #0.0: Video: [0][0][0][0] / 0x0000, q=2-31, 64 kb/s, 90k tbn
     Stream #0.1: Audio: [0][0][0][0] / 0x0000, 0 channels, 64 kb/s
     Stream #0.2: Subtitle: [0][0][0][0] / 0x0000, 64 kb/s
Codec type mismatch for mapping #0.2 -> #0.2
=================================================================

It seems it expects a subtitle track for the #0.2 output stream. I 
didn't see how to change that. I tried to use the "-newaudio" parameter 
but without any success.

My problem is also that my version of ffmpeg seems a bit outdated 
compared to the online doc.

Thanks for any help.