[paranoia] remove leading/trailing silence

[Bernhard Kuemel]

Hi Jason, Chris!

The docs of cdparanoia say that it will not (yet) strip silence
from wavs it ripped and while trying to find a tool that would
strip silence or else making it some people showed up who would
also appreciate such a tool, possibly with some extra
functionality. While researching the wav file format I found that
they are more complex than I initially thought and have some
peculiarities. E.g. there may be chunks with index positions
which I probably should recalculate when stripping leading
silence.

Since you have already implemented much of wav/riff file handling
it would IMO be a rather simple task to add an option for
stripping leading/trailing silence to your tools (normalize,
shntool). I probably would only make a tool that accepts or
handles rather basic wav/riff files properly so making a better
tool with less effort seems a better idea.

Please tell us, what you think about it. In the meantime I will
rather set up my server so it automatically rips, encodes, id3
tags and stores CDs when you only put it into the CD ROM drive.

Thank you, Bernhard

Torkell Tagseth wrote:
> On Mon, Apr 09, 2001 at 07:15:01PM +0200, Fredrik Mellstrom wrote:
> > On Mon, Apr 09, 2001 at 04:38:22PM +0200, Bernhard Kuemel wrote:

> > > I could not find a linux commandline tool that removes
> > > leading/trailing silence from wav/mp3 files so I started
> > > programming one for wav files. If there already is one, or an
> > > option in cdparanoia, please tell me via email.

> > Oh, neat!  Great idea!  :-)  I don't know of one either, and I've
> > wanted a batch tool for this a long time, so I'd definitely use
> > it.  Some thoughts / suggestions:
> >
> > - Please make it possible to optionally cut off data so that the
> >   resulting file is a multiple of whole CD audio frames, 2352
> >   bytes.
> >
> > - One possible future improvement could be an option to not simply
> >   strip silence, but to also *add* a small amount of silence and a
> >   fadein / fadeout, to *really* make sure there are no clicks or
> >   glitches.
> >
> > - Just a thought, but perhaps you should submit this functionality
> >   as a patch to the 'normalize' program?  I mean, having several
> >   different operations, that all require separate programs with
> >   their own scanning and modification passes, would be very
> >   inefficient performance-wise and also kill my hard drive ;-).
> >   This rather useful volume normalizer can be found at:
> >   http://www.cs.columbia.edu/~cvaill/normalize/
> >
> >   It's still not perfect, but it often works well, and it's the
> >   first unix program I know of that does some sort of batch volume
> >   compression, without clipping.

> Check out http://shnutils.freeshell.org/shntool/
> It lets you shift track boundaries forwards or backwards so that the
> data of each file is a multiple of 2352 bytes. It has quite a few other
> features as well, like joining and splitting waves.
> 
> hth,
> 
> Torkell
> 
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