I use ffmpeg in a very simple command to concatenate WAV audio files:

ffmpeg -f concat -i ffmpeg_wav_file_order.txt -c copy outputFile.wav

where ffmpeg_wav_file_order.txt contains for example:

file file1.wav
file file2.wav
file file3.wav

All good.

Now, I would like to be able to specify periods of silence between the files, for example:
* no period of silence before file1 start-of-content
* 1 sec period of silence between file1 end-of-content and file2 start-of-content * 2.2 sec period of silence between file2 end-of-content and file3 start-of-content

Can somebody offer a simple solution ?

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