Strip_silence

strip_silence and strip_wav

 strip_silence 0.1 removes silence at the end of .wav files, and prints a
command 
to re-add the silence (with the included add_silence). It's intended for use
with
44100 Hz 16-bit stereo PCM files, such as CD Audio. A nice feature is that it 
leaves a little silence at the end (1 second by default). 
This can be used to strip trailing silence from odd files, but retain the
ability
to re-add it and get the original file back.

 strip_wav 0.1 is useful in some situations where strip_silence isn't, such as 
when the silence at the end of the file isn't entirely zeroes. It strips a
number 
of bytes from the end of a .wav, by default 10 seconds worth of 44100 Hz 16-bit 
stereo PCM, regardless of whether they are perfectly silent. It also prints a 
command to restore the file; if the stripped bytes were all zero the command is 
add_silence (included), otherwise it backs up the original file and prints a
copy 
command.