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Re: [MMUSIC] T140: Usage of "-"fmt value in dcsa encapsulated fmtp attribute

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 16 December 2019 19:23 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>, Roni Even <ron.even.tlv@gmail.com>
Thread-Topic: [MMUSIC] T140: Usage of "-"fmt value in dcsa encapsulated fmtp attribute
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Date: Mon, 16 Dec 2019 19:23:30 +0000
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Subject: Re: [MMUSIC] T140: Usage of "-"fmt value in dcsa encapsulated fmtp attribute
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Roni, note that this impacts you.

Regards,

Christer

On 16/12/2019, 18.10, "mmusic on behalf of Paul Kyzivat" <mmusic-bounces@ietf.org on behalf of pkyzivat@alum.mit.edu> wrote:

    On 12/16/19 11:05 AM, Christer Holmberg wrote:
    > Hi,
    > 
    > I'd be ok with the subchannel identifier.
    > 
    > I do think it would be good to add some generic text to sdpneg, though, saying that whenever the media description format or PT number would normally be used in an attribute (e.g., the fmtp attribute), when encapsulated in a dcsa attribute the subchannel identifier is used instead.
    
    +1
    
    > Regards,
    > 
    > Christer
    > 
    > 
    > On 16/12/2019, 17.58, "mmusic on behalf of Paul Kyzivat" <mmusic-bounces@ietf.org on behalf of pkyzivat@alum.mit.edu> wrote:
    > 
    >      On 12/16/19 10:34 AM, Flemming Andreasen wrote:
    >      
    >      >> Also, I think we should aim at being aligned with the RTP usage when it comes to SDP attributes.
    >      > Agreed again. I think the "fmtp" attribute is the right one to use here
    >      > - the question is simply what format value we use. I'm leaning towards
    >      > "t140", but we should get some general text in sdpneg to account for
    >      > additional media formats in the future.
    >      
    >      IIUC you are proposing that the format value in fmtp attributes for data
    >      subchannels should be the subchannel identifier. Is that right?
    >      
    >      While that is redundant I won't oppose that.
    >      
    >      	Thanks,
    >      	Paul
    >      
    >      	
    >      
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