[FFmpeg-user] FFmpeg apply same audio mixing to multiple output

Jeromy jhwang81 at nate.com
Mon Mar 30 15:45:40 CEST 2015

Please excuse me for bad english.
I need to create three mixed audio file (pcm, amr, mp3), starting from
original pcm or amr audio file.

In order to do this I use following command:

./ffmpeg -i 1.amr -i 2.amr -filter_complex
amix=inputs=2:duration=longest:dropout_transition=2 -c:a amr_nb -ac 1 -ar
8000 -b:a 12.2k -y output1.amr -c:a pcm_alaw -ac 1 -ar 16000 -y output2.wav
-c:a pcm_mulaw -ac 1 -ar 16000 -y output2.wav

The problem is that audio mixing is applyed only to first amr file. How can
I apply the audio mixing to all output file.

Stream mapping:
  Stream #0:0 (amrnb) -> amix:input0 (graph 0)
  Stream #1:0 (amrnb) -> amix:input1 (graph 0)
  amix (graph 0) -> Stream #0:0 (libopencore_amrnb)
  Stream #0:0 -> #1:0 (amr_nb (amrnb) -> amr_nb (libopencore_amrnb))

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