I know that sox can adjust the volume of a sound file and I have used it before, but... sox will not read this file. It is an .m4a file that someone else recorded and sent to us. Sox and play will not read it, the error when try to adjust the volume is:

:~$ sox -v 0.1 Kedushah.m4a Kedushah.mp3
sox FAIL formats: can't open output file `Kedushah.mp3': SoX was compiled without MP3 encoding support

Xine, also, will not read it.  Only mplayer will play the file.

Is there any way to adjust the volume? Can mplayer be told to adjust the volume of a file that it is playing? I have looked through the man file and used -list-options, but if it is there then missed it.

Marc


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