Re: [AVT] FW: I-D ACTION:draft-smundra-avt-rtp-red-non-audio-00.txt

[Magnus Westerlund <magnus.westerlund at ericsson.com>]

Mundra, Satish wrote:

> All,
>
> Please review and comment on draft-smundra-avt-rtp-red-non-audio-00.txt 
> which has been made available as Internet Draft.

Hi Satish,

I have a few comments about this draft.

1. The motivation for this payload format. As I understand you like to 
have a redundancy payload format customized for applications that has 
small packets and is only dependent on the RTP sequence number. In other 
words T140 or RFC 2833. As both are already specified and I would assume 
certain amount of deployment with the current version of RED, such a 
change seems unlikely do be desired. It only results in having two 
mechanisms to implement.

There are also other alternatives to provide redundancy. Both RFC 2733, 
and the RTP retransmission format can also be used to provide 
redundancy. However they are not capable of multiplexing multiple 
payloads together, thus maybe not the most suitable for small payloads.

However it is questionable if the motivation is sufficient for the work.

2. Updating the MIME type: I don't think updating the existing MIME type 
with a parameter, for this use case is any good. I think simply 
providing a new MIME type for a variant is a better choice with less 
backwards compatibility issues. Also please use the MIME template when 
writing registrations.

So I would recommend that before any more work is performed at the 
solution, the actual needs and requirements are discussed much more. I 
would like to see significant support and a clear motivation for this 
solution before accepting it as an WG item.

Cheers

Magnus Westerlund

Multimedia Technologies, Ericsson Research EAB/TVA/A
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