[Freeswitch-users] MP2
Thomas Auge
auge at virtues.net
Sat Jan 3 01:54:58 MSK 2015
> G722 can be a native bearer capability on an ISDN b-channel but thats not widely used. MP2 in your case is just
> establishing a data channel be it via ISDN or IP.
Yup. I'm fairly certain that's what FreeTDM does for G722, else it wouldn't make much sense to have a codec
configuration option. :)
> Before proceeding I would seek out a license compatible encoder/decoder library that can be used, MP2 can mean so many
> things their are multiple levels, options and details required to properly implement it. I highly suspect its not an
> afternoon event, I could be wrong if the right library is found thats license compatible.
There are a couple, T(w/o)oLame comes to mind. (http://www.twolame.org/ LGPL licensed) Any pointers as to which
capabilities are needed in such a library? It seems the libraries are as outdated as the codec. :)
> On Fri, Jan 2, 2015 at 4:20 PM, Thomas Auge <auge at virtues.net <mailto:auge at virtues.net>> wrote:
>
> There are ISDN devices which establish a digital (data) ISDN connection and then use all kinds of codecs on top of that.
> Think FreeTDM with G722 - same thing. As far as I know FreeTDM doesn't care which codec you choose for a digital
> connection. G722 is just the most common use case.
>
> MP2 is still a widely used standard in broadcast, i.e. for remote contributions.
>
> On 02.01.2015 19:08, Brian West wrote:
> > I'm still puzzled as to why mp2, since ISDN is native PCM (ulaw/alaw), Do you have some legacy files or systems you're
> > working with that require this? Trying to fully understand your thought process and needs.
> >
> > On Fri, Jan 2, 2015 at 4:04 PM, Thomas Auge <auge at virtues.net <mailto:auge at virtues.net> <mailto:auge at virtues.net <mailto:auge at virtues.net>>> wrote:
> >
> > Digital ISDN calls, so I think as far as freeswitch is concerned, voice calls, yes.
> >
> >
> > On 02.01.2015 18:52, Brian West wrote:
> > > In what context? playing sound files, voice calls what?
> > >
> > > On Fri, Jan 2, 2015 at 3:49 PM, Thomas Auge <auge at virtues.net <mailto:auge at virtues.net> <mailto:auge at virtues.net <mailto:auge at virtues.net>>
> <mailto:auge at virtues.net <mailto:auge at virtues.net> <mailto:auge at virtues.net <mailto:auge at virtues.net>>>> wrote:
> > >
> > > Hello list,
> > >
> > > would it be a big task to add mp2 (transcoding) to freeswitch? What would be a realistic bounty for it?
> > >
> > > Cheers!
> > >
> > > Thomas
> > >
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> > */Brian West/*
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> */Brian West/*
> brian at freeswitch.org <mailto:brian at freeswitch.org>
>
>
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