MKV audio + AVI vide -> NEW AVI Options

[kwanbis]

I have two files: old.avi, and old.mkv.

I want to take the video stream from old.avi (XVID) and an audio stream from old.mk (aac) and create a new AVI file.

Since I have to do it repatedly I want to use ffmpg, and I have been trying to understand the parameters, and this is the one I understand it should work:

ffmpeg -i old.avi -vcodec copy -i old.mkv -acodec libmp3lame new.avi

ffmpeg -i old.avi -c:v copy -i old.mkv -c:a libmp3lame new.avi

But I get Unknown decoder 'copy':

CODE

c:\ffmpeg>ffmpeg -i old.avi -vcodec copy -i old.mkv -acodec libmp3lame  new.avi
ffmpeg version N-39664-g6bfb304 Copyright (c) 2000-2012 the FFmpeg developers
  built on Apr  9 2012 20:32:46 with gcc 4.6.3
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass
--enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable
-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libope
njpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libth
eora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --e
nable-zlib
  libavutil      51. 46.100 / 51. 46.100
  libavcodec     54. 14.101 / 54. 14.101
  libavformat    54.  3.100 / 54.  3.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 67.101 /  2. 67.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 10.100 /  0. 10.100
  libpostproc    52.  0.100 / 52.  0.100
[mpeg4 @ 0000000001edf8e0] Invalid and inefficient vfw-avi packed B frames detec
ted
Input #0, avi, from 'old.avi':
  Metadata:
    encoder         : VirtualDubMod 1.5.10.1 (build 2439/release)
  Duration: 00:47:08.56, start: 0.000000, bitrate: 1027 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv
420p, 512x288 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16, 32 kb/s
Unknown decoder 'copy'

CODE

c:\ffmpeg>ffmpeg -i old.avi -vcodec copy -i old.mkv -acodec libmp3lame new.avi
ffmpeg version N-39664-g6bfb304 Copyright (c) 2000-2012 the FFmpeg developers
  built on Apr  9 2012 20:32:46 with gcc 4.6.3
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass
--enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable
-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libope
njpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libth
eora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --e
nable-zlib
  libavutil      51. 46.100 / 51. 46.100
  libavcodec     54. 14.101 / 54. 14.101
  libavformat    54.  3.100 / 54.  3.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 67.101 /  2. 67.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 10.100 /  0. 10.100
  libpostproc    52.  0.100 / 52.  0.100
[mpeg4 @ 000000000037f8e0] Invalid and inefficient vfw-avi packed B frames detec
ted
Input #0, avi, from 'old.avi':
  Metadata:
    encoder         : VirtualDubMod 1.5.10.1 (build 2439/release)
  Duration: 00:47:08.56, start: 0.000000, bitrate: 1027 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv
420p, 512x288 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16, 32 kb/

s
Unknown decoder 'copy'

Any ideas on what I'm doing wrong?

This post has been edited by kwanbis: Apr 15 2012, 06:04