[Asterisk-video] Asterisk and video contents for 3G network
Sergio García Murillo
Sergio.Garcia at ydilo.com
Fri Aug 25 00:02:56 MST 2006
3G H324M has H263 (profile level 0 I think) and gsm amr as mandatory codecs.
There are also terminals that offer g723 and MPEG4 support.
-----Original Message-----
From: asterisk-video-bounces at lists.digium.com [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of tech at i6net.com
Sent: jueves, 24 de agosto de 2006 15:29
To: Development discussion of video media support in Asterisk; Ramtin Amin
Cc: PHILIPPE ROUDEL
Subject: RE: [Asterisk-video] Asterisk and video contents for 3G network
Can you confirm that 3G (H324M) handle the video with H263/H263+ codec ?
If Asterisk could play video contents, this should be in H263/H263+/H263 format/codec.
Selon Ramtin Amin <keytwho at hotmail.com>:
> I've pretty much implemented my 3G gateway using Asterisk.
> I can currently handle H223 annexe A and B with Golay, AL1 and AL2
> with 16bit CRC, H245 , AMR-NB in if2 format, + H263 qcif.
> I need to do some fixing to make it clear.
> I could eventually transcode the AMR-NB using ffmpeg but that wouldn't
> let it be LGPL anymore and wouldnt be able to implement it insize
> chan_zap.c but if I don't decode the AMR, then the SIP phone behind
> has to be capable of handling AMR-NB...
> If someone wants some info, you are welcome!
>
>
>
>
> > Subject: RE: [Asterisk-video] Asterisk and video contents for 3G
> > network>
> Date: Thu, 24 Aug 2006 12:03:56 +0200> From: proudel at nortel.com> To:
> proudel at nortel.com; asterisk-video at lists.digium.com> CC: > > The video
> codecs optimized for 3G are 3GP or 3GP2> > -----Original Message----->
> From: ROUDEL, PHILIPPE (CTF:8R50) > Sent: jeudi 24 août 2006 12:02>
> To: 'Development discussion of video media support in Asterisk'>
> Subject: RE: [Asterisk-video] Asterisk and video contents for 3G
> network> > 3G video do not use H... (H263 or H245) protocols only AMR
> video conversion (transcoding) is required.> > -----Original
> Message-----> From: asterisk-video-bounces at lists.digium.com
> [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Sergio
> García
> Murillo> Sent: lundi 24 juillet 2006 12:23> To: Development discussion
> Murillo> of
> video media support in Asterisk> Subject: RE: [Asterisk-video]
> Asterisk and video contents for 3G network> > tech at i6net.com wrote:> >
> Have any one test an Asterisk throw a 3G gateway (constuctor,> >
> reference) ? > I have made some test calls against some 3G video
> gateways, they are much nicer in the
> h245 negotiations and don't complaint with slight differences in the
> order of the messages. > > > How to you generate the video contents to
> pass throw the 3G GW (tool> > to manage the video files .h263)? > >
> The encoding, bitrate and timing seems to be very important to have a>
> > good quality on the 3G phone... how control this parameters ? > >
> Currently we don't have transcoding capabilities in asterisk for video
> (and I don't think we will have it in the near future) the h263 should
> be optimized in the source for 3G. GSM Amr need also to be supported,
> at least be able to pass trough (I have seen many phones supporting
> g723 but I think you can't grant that all terminals support it).> >
> Greetings> Sergio> > > > > > > i6net> > > > > > Selon Sergio García
> Murillo <Sergio.Garcia at ydilo.com>:> > > >> > >> H223 Annex B without
> double headres (H324M level 2).> >> If you are looking at the
> UCLA/Samsung h223 simulator i understand> >> that you think it's not
> easy, but i have still not found any device> >> (phone or gateway),
> that implements annex C.> >> I use zaptel and a libpri, it would need
> some modification in
> order> >> to > >> be configurable, but hardcoding the q931 setup info
> order> >> is
> quite easy.> >> > >> ________________________________> >> > >> From:
> asterisk-video-bounces at lists.digium.com> >>
> [mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Ramtin>
> >>
> Amin> >> Sent: lunes, 24 de julio de 2006 8:26> >> To: Development
> Amin> >> discussion
> of video media support in Asterisk> >> Subject: RE: [Asterisk-video]
> H324M 3G
> ISDN> >> > >> > >> Well I'm working on ir currently> >> So if we want
> ISDN> >> > >> > >> to do
> it, since it doesn't look that easy, we better> >> share our knowledge
> about it.> >> Sergio: In H223, which annexe is used ?> >> I've found
> some interesting stuff capable of handling the H223+245> >> but > >> I
> wanted to understand it more and when you look at the ITU, and it> >>
> gets into the
> Golay(24,12) and BCH code, it starts to become more> >> complicated :)
> Tell us more about your expiriance: you modified the> >> libpri for
> answering correctly the q.931 ? You use /don't use zaptel> >> ? How
> do you capture raw data ? cat /dev/zap/12 ? or with an> >> app_zapgrab
> ? > >> DO you use BRI or PRI ?> >> > >> > >> > >> > >> > >> > >> > >>
> > >> > >> ________________________________> >> > >> Subject: RE:
> [Asterisk-video] H324M 3G ISDN> >> Date: Mon, 24 Jul 2006 08:15:06 +0200> >> From:
> Sergio.Garcia at ydilo.com> >> To: asterisk-video at lists.digium.com> >> >
> >> >
> >> Hi everyone,> >> > >> It's good to see that i'm not the only one
> developping int this> >> subject. I have been working on an h234M
> library, i have finished> >> AL1 and AL2 > >> of h223 (level 2
> profile), and almost finished the h245 negotiators.> >> I > >> have
> been able to establish a videocall between an asterisk box and a> >>
> motorola phone, but i'm having problems with the negotiations on> >> other phones. Are any one of you going
> to start an open source> >> proyect? > >> > >> Greetings> >> Sergio> >>
> > >> > >> > >> ________________________________> >> > >> Be one of the
> > >> > >> > >> first
> to try Windows Live Mail.> >> > >
>
<http://ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e-4911fb2b2e6d>>
> >> > >> > >
>
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