[FFmpeg-user] Concatenate several audio files with FFmpeg, how ?

[Rodney Baker]

On Fri, 19 Oct 2012 04:17:56 PyProg PyProg wrote:
> Hello all,
> 
> Is it possible to concatenate several audio files with FFmpeg ?, an how ?
> 
> In this example I tried to do it but on arrival there was only the
> first audio file (second audio file is not present):
> 
> [...snip...]

Try  using -filter_complex with the concat filter, but note - you cannot do 
stream copying with this; you must re-encode.

This is a working example that I used recently to concatenate 2x mp4 files and 
re-encode to flv. You should be able to adjust the parameters accordingly but 
I don't know if it will work with audio only. If it does, you'll need the -vn 
switch to tell it that there is no video stream. The following is on one 
single line:

ffmpeg -i <file_1> -i <file_2> -filter_complex concat=n=2:v=1:a=1 -vcodec flv1 
-b:v 256k -acodec libmp3lame -b:a 128k <out_file>

Someone more familiar with the concat filter and filter_complex can probably 
explain what each section does here. I'm not really sure - I just copied what 
someone else had done. 

HTH. YMMV.
Rodney.

-- 
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Rodney Baker VK5ZTV
rodney.baker at iinet.net.au
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