[Libav-user] Mixes multiple audio inputs into a single output.

[Alan]

Dear all,

I'd like to mix two audio into a single output.

But I always got this error

#ffmpeg -i 1.wav -i 2.wav -filter_complex 
amix=inputs=2:duration=first:dropout_transition=2 out.wav


ffmpeg version 0.11.2 Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov  5 2012 10:44:13 with gcc 4.7.1 20120723 [gcc-4_7-branch 
revision 189773]                                                    
  configuration: --disable-yasm                                                                                                             
  WARNING: library configuration mismatch                                                                                                   
  avutil      configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  avcodec     configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  avformat    configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  avdevice    configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  avfilter    configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  swscale     configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  swresample  configuration: --prefix=/usr --disable-yasm --enable-shared                                                                   
  libavutil      51. 54.100 / 51. 54.100                                                                                                    
  libavcodec     54. 23.100 / 54. 23.100                                                                                                    
  libavformat    54.  6.100 / 54.  6.100                                                                                                    
  libavdevice    54.  0.100 / 54.  0.100                                                                                                    
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from '1.wav':
  Duration: 00:00:03.76, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, 
s16, 1411 kb/s
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, wav, from '2.wav':
  Duration: 00:00:03.76, bitrate: 1411 kb/s
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, 
s16, 1411 kb/s
[abuffersink @ 0x10dd900] No opaque field provided, an AVABufferSinkParams struct 
is required
Error configuring filter.


If this is not the right place to post this question, please correct me.

Thanks
BRs

Alan