Hi Waldo,
Doesn't * record to .gsm file initially and then convert these to .wav
later? I may be totally off the mark here, and if I am, I welcome the
correction.
In that case, why not leave the files in .gsm format instead of
translating them into another lossy format? Obviously if * records
conversations as .wav files then I'd be leaning toward Speex (Vorbis) as
it is a "suited to speech" compression format.
Both Speex and ogg are Open Source, therefore patent issues are likely
non-existent. MP3, otoh, is fine if you use one of their approved apps,
and not if you use anything else. I'm steering clear of .mp3 (and have
been for quite a few years now).
--
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> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com
> [mailto:asterisk-users-bounces@lists.digium.com]
> On Behalf Of Waldo Rubinstein
> Sent: Tuesday, 8 November 2005 11:32
>
> Wasn't aware of it, but if quality is good, it makes sense
> since all I'm archiving is speech.
>
> Will evaluate further.
>
> Thanks,
> Waldo
>
> On Nov 7, 2005, at 7:14 PM, Mark Edwards wrote:
>
> > I would recommend vorbis speex for this.
> > You can get windows drivers to read speex files directly.
> >
> > Vorbis are the same bunch that develops ogg.
> >
> > Ogg and mp3 are more suited to music rather than speech.
> > Speex is a much better fit for speech archiving.
> >
> > Mark
> >
> >
> > -----Original Message-----
> > From: BJ Weschke [mailto:bweschke@gmail.com]
> > Sent: Tuesday, 8 November 2005 5:52 AM
> >
> > You're probably not going to be violating any patent
> > protections by using OGG instead of MP3. As far as
> > compression goes, I've found the difference between
> > the two of them to be negligible. I've always used
> > OGG when possible to stay "IP safe".
> >
> > On 11/7/05, Waldo Rubinstein <waldo@trianet.net> wrote:
> >> I'm trying to archive out call recordings and would
> >> appreciate some feedback as to which audio compression is
> >> more recommended MP3 or OGG. In the past, I've use lame
> >> to convert to MP3, but I noticed the audio volume drops
> >> significantly. Is it just a setting on the command line
> >> of lame or is OGG better? Which achieves higher
> >> compression rates while maintaining call quality?
> >>
> >> Thanks,
> >> Waldo