Re: Adjusting sound file volume (SOLVED)

[Marc Shapiro <marcnshap@gmail.com>]

On 02/25/12 06:30, Rob Owens wrote:
> On Fri, Feb 24, 2012 at 11:54:08PM -0800, Marc Shapiro wrote:
> > 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.
> You can look at 'aacgain' and a frontend for it 'easymp3gain-gtk'

Thanks to everyone who has commented on this.  Using aacgain I was able 
to adjust the volume of the mp3s that I have as well as the m4a file. 
The mp3s, in this case, were unusually low in volume and the problem was 
that either we could not hear the mp3s, or the m4a blasted our ears.  I 
decided to adjust the volume up on the mp3s but had to be careful not to 
run into clipping problems.  It is good to have something that will 
handle the m4a, although I may eventually just convert it to mp3.  (It 
is the only m4a file that I have.)  As Bob said, I could output to .wav 
with the volume adjusted and then convert to mp3 with lame.  For now, 
though, everything is good.  Thanks again, everybody.

Marc