Re: [rtcweb] RTP Usage: Is RTP Retransmission REQUIRED or RECOMMENDED

["Roni Even" <[e-mail]>]

Hi,

You are right about the decoder, but this requires the encoder to keep the
information since it may be required later. In the case of non real-time
data this is not a problem since the data is in prerecorded but here the
data is not usually kept after transmission.

The whole discussion here is about required or recommended. My point is that
it is recommended since it does not work without any assumption on the RTT
and the receiver behavior when using jitter buffer.

Roni

 

From: [e-mail] [mailto:[e-mail]] On Behalf Of
Stefan Holmer
Sent: 29 June, 2012 9:31 AM
To: Magnus Westerlund
Cc: [e-mail]
Subject: Re: [rtcweb] RTP Usage: Is RTP Retransmission REQUIRED or
RECOMMENDED

 

Doesn't this in the end boil down to what tools we have for baseline
resilience? Retransmissions are fairly easy to implement and will in most
cases give a much better experience than for example relying on periodic key
frames or doing key frame requests. Also it isn't necessary for the decoder
to support decoding streams with lost packets. 

 

/Stefan

 

On Fri, Jun 29, 2012 at 8:43 AM, Magnus Westerlund
<[e-mail]> wrote:

On 2012-06-28 16:36, Cullen Jennings wrote:
>
> I think you need to separate this for audio and video and be far more
> specific about what type of retransmit ion you are talking about. In
> many cases the retransmit ion schemes for audio make the end suer
> experience worse.

I am not disagreeing unless the RTT is really low.

What I am asking the WG is if RTP retransmission is a RECOMMENDED or
REQUIRED feature in the toolbox that an WebRTC end-point supports. This
says nothing on when you select to use it and on which media. If we want
to include such recommendations we can do it. In fact the RTP usage
draft has a bit on text discussing the issue with RTT.

Cheers

Magnus
(As WG chair)


>
> On Jun 27, 2012, at 24:36 , Magnus Westerlund wrote:
>
>> WG,
>>
>> We had a discussion at the interim if RTP Retransmission is to be
>> considered REQUIRED or RECOMMENDED to implement. I would like to
>> see if we can first have some discussion on this topic before
>> moving on to see if we can get a consensus here on the mailing
>> list.
>>
>> Please provide your views on this topic.
>>
>> Cheers
>>
>> Magnus Westerlund (As Chair and document editor)
>>
>>
>> ----------------------------------------------------------------------
>>
>>
Multimedia Technologies, Ericsson Research EAB/TVM
>> ----------------------------------------------------------------------
>>
>>
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>>
>>
>>
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>
>



--

Magnus Westerlund


----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB                | Phone  [phone]
<tel:%2B46%2010%207148287> 
Färögatan 6                | Mobile [phone]
<tel:%2B46%2073%200949079> 
SE-164 80 Stockholm, Sweden| mailto: [e-mail]
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