[FFmpeg-user] How to delete digital silence?

[Барт Гопник]

I've created test file in sound editor (https://goo.gl/IJY9t6): 1
second (44 100 samples) of silence + 1 second (44 100 samples) of
simple sine 1kHz waveform + 1 second (44 100 samples) of silence =
total 3 seconds (132 300 samples), and save it as input.wav

After it, I use FFMPEG to remove silence using the following command line:

ffmpeg -i input.wav -af silenceremove=1:0.1:0:1:0.1:0 output.wav

The resulting file, output.wav, contains total 44 981 samples: 44 099
samples of simple sine 1kHz waveform (the first sample of simple sine
1kHz waveform is truncated) + 882 samples of silence. Instead of
expected total 1 second (44 100 samples) of simple sine 1kHz waveform.

WAIDW?