C:\Users\TD\Documents\Visual Studio 2010\Projects\FFsplit-0.1.7\FFsplit\bin\Debu
g>ffmpeg -f lavfi -i "amovie=Mic.flv [a0]; amovie=Mic.mp3 [a1]; [a0][a1] amerge"
 -acodec pcm_s16le -ac 2 -f wav pipe:1 | ffmpeg -y -i pipe:0 -i Mic.flv -vcodec
copy -acodec copy -f flv output.flv
ffmpeg version N-39995-g9750254 Copyright (c) 2000-2012 the FFmpeg developersffm
peg version N-39995-g9750254
 Copyright (c) 2000-2012 the FFmpeg developers  built on Apr 19 2012 22:11:27 wi
th gcc 4.6.2

  configuration: --pkg-config=pkg-config --prefix=/home/td/software/packages/win
32 --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64
-mingw32- --enable-libx264 --enable-libmp3lame --enable-gpl --enable-nonfree --d
isable-w32threads
  built on Apr 19 2012 22:11:27 with gcc 4.6.2
  configuration: --pkg-config=pkg-config --prefix=/home/td/software/packages/win
32 --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64
-mingw32- --enable-libx264 --enable-libmp3lame --enable-gpl --enable-nonfree --d
isable-w32threads
  libavutil      51. 46.100 / 51. 46.100
  libavcodec     54. 14.101 / 54. 14.101
  libavutil      51. 46.100 / 51. 46.100
  libavformat    54.  3.100 / 54.  3.100
  libavcodec     54. 14.101 / 54. 14.101
  libavdevice    53.  4.100 / 53.  4.100
  libavformat    54.  3.100 / 54.  3.100
  libavfilter     2. 71.101 /  2. 71.101
  libavdevice    53.  4.100 / 53.  4.100
  libswscale      2.  1.100 /  2.  1.100
  libavfilter     2. 71.101 /  2. 71.101
  libswresample   0. 11.100 /  0. 11.100
  libswscale      2.  1.100 /  2.  1.100
  libpostproc    52.  0.100 / 52.  0.100
  libswresample   0. 11.100 /  0. 11.100
  libpostproc    52.  0.100 / 52.  0.100
[amovie @ 0169cca0] seek_point:0 format_name:(null) file_name:Mic.flv stream_ind
ex:1
[mp3 @ 039497c0] max_analyze_duration 5000000 reached at 5015510
[amovie @ 03c29020] seek_point:0 format_name:(null) file_name:Mic.mp3 stream_ind
ex:0
[amerge @ 0169cc40] Inputs overlap: output layout will be meaningless
[amerge @ 0169cc40] in1:stereo + in2:stereo -> out:4.0
[lavfi @ 0169c160] Could not find PCM codec for sample format (null).
pipe:0: Invalid data found when processing input