[gst-devel] Support of audio/mpa-robust [was: Fwd: Re: [Helix-server-dev] MIME type for MP3 file]

[Fabrice Triboix]

FYI

--- Jamie Gordon <jgordon at real.com> wrote:

> Date: Fri, 10 Nov 2006 11:13:29 -0800
> From: Jamie Gordon <jgordon at real.com>
> To: Fabrice Triboix <gstdbg at yahoo.com>
> CC: helix-server-dev at helixcommunity.org
> Subject: Re: [Helix-server-dev] MIME type for MP3
> file
> 
> audio/mpa (RFC 2250) is not used for MP3 because it
> is not sufficient
> for UDP streaming of layer 3 audio (MP3), only
> layers 1 and 2.
> 
> The packetization used, audio/x-mp3-draft-00 is an
> old proprietary
> (sort of) packetization that was created just prior
> to RFC 3119,
> audio/mpa-robust. It is similar to audio/mpa-robust
> in some ways, but
> without interleaving.
> 
> The packet format is just exactly one ADU frame per
> packet. It's
> supported by helix/Real players and any players
> using the reference
> RFC 3119 implementation at live555.com.
> http://live555.com/liveMedia/
> 
> RFC 3119 support was added to the helix client long
> ago, but there
> has never been much demand to update the server to
> use it. If gstreamer
> supports audio/mpa-robust, then it should be trivial
> to add support for
> audio/x-mp3-draft-00. If not, then you won't be able
> to do much
> streaming of MP3 over RTSP with it!
> 
> Jamie
> 
> Fabrice Triboix wrote:
> > Hi all,
> > 
> > I am currently working on the gstreamer project,
> on the RTSP/RTP side
> > of things. I am using Helix DNA server as a
> backend to stream MP3
> > files.
> > 
> > Currently, gstreamer is not able to play an MP3
> file through helix,
> > and I suspect this is because of the way the helix
> server advertise
> > it. Helix replies to a DESCRIBE request with an
> SDP, and the media is
> > described as audio/X-MP3-draft-00. This MIME type
> does not look
> > standard at all; after some googling, it seems
> that it is defined and
> > used only by helix/real server/player.
> >  
> > So I have two questions: - why don't you use
> audio/mpa? - does your
> > special MIME type indicates that you use a special
> RTP payload as
> > well?
> > 
> > Thank you for your help!
> > 
> > Fabrice
> > 




 
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