RE: Format and mechanism to stream

Hello Stefan,

 

Our group will be reviewing proposals over the next few weeks.  But as of yet, no, we have no suggestions about how codec, bitrate, etc will be specified.

 

I just joined the RTC-Web mailing list, so looking forward to future discussion.

 

Thank you

 

________________________________

From: Stefan Håkansson LK [mailto:stefan.lk.hakansson@ericsson.com] 
Sent: Monday, February 07, 2011 3:46 AM
To: Young, Milan; public-xg-htmlspeech@w3.org
Subject: RE: Format and mechanism to stream

 

Hi Milan, thanks for your response.

 

I understand your point about codec, but I was not after _what_ codec you are using in a certain demo/test, but rather _how_ the application selects media format. Somehow the application should be able to select format (and this is not only codec, but also e.g. sample rate, bitrate etc.). Have you been thinking anything about an API for that purpose in the group?

 

WebSockets could be an alternative for transport, in fact we have used it in a demo (but for communication, the media goes via a relay): https://labs.ericsson.com/developer-community/blog/beyond-html5-conversational-voice-and-video-implemented-webkit-gtk

 

RTC-Web is not a formal group yet. I think the best way to follow is to subscribe to the maillist: http://www.alvestrand.no/mailman/listinfo/rtc-web, and look at http://rtc-web.alvestrand.com/overview.

 

Br, Stefan

 

>Hello Stefan,
>
>I think most of us in this group are interested in the progress of RTC-Web, so I was glad to read your post.
>
>Regarding codec, our group has the preference that it is not encumbered with IP issues, high quality relative to bandwith, etc.  I do not speak for everyone here, but Nuance has personally experimented with "Speex" with positive results.
>
>No group discussions on framing.  My hope is that we could model this somewhat around RTP which allows user-specified rates.  I know SpeeX has developed an IETF specification of what this might look like: http://tools.ietf.org/html/draft-ietf-avt-rtp-speex-07
>
>There has been a little discussion around protocol, but no decisions.  My personal preference is centered on WebSockets as it would probably offer the highest quality service.
>
>Do you have any opinions on these matters?
>
>Perhaps I could volunteer to begin participating in your group, and thus act as a liaison.  What would be the best way to proceed?
>
>
>Thanks
>>
>>
>>
>>-----Original Message-----
>>From: public-xg-htmlspeech-request@w3.org <mailto:public-xg-htmlspeech-request@w3.org?Subject=RE%3A%20Format%20and%20mechanism%20to%20stream&In-Reply-To=%253C1AA381D92997964F898DF2A3AA4FF9AD0A1F3B8B%40SUN-EXCH01.nuance.com%253E&References=%253C1AA381D92997964F898DF2A3AA4FF9AD0A1F3B8B%40SUN-EXCH01.nuance.com%253E>  [mailto:public-xg-htmlspeech-request@w3.org <mailto:HYPERLINK> ] On Behalf Of Stefan Håkansson LK
>>Sent: Thursday, February 03, 2011 2:55 AM
>>To: public-xg-htmlspeech@w3.org <mailto:public-xg-htmlspeech@w3.org?Subject=RE%3A%20Format%20and%20mechanism%20to%20stream&In-Reply-To=%253C1AA381D92997964F898DF2A3AA4FF9AD0A1F3B8B%40SUN-EXCH01.nuance.com%253E&References=%253C1AA381D92997964F898DF2A3AA4FF9AD0A1F3B8B%40SUN-EXCH01.nuance.com%253E> 
>>Subject: Format and mechanism to stream
>>
>>Hi.
>>
>>I've not followed this list before. I am working a bit on RTC-Web stuff. In our internal work we're using the <device> element to connect mic/cam and generate a stream (Stream API as outlined in the WhatWG html draft).
>>
>>That stream we use as input to addStream to ConnectionPeer (still according to the WhatWG html draft).
>>
>>I understand that there is some experimenting in this community using <device> to connect a mic, and then streaming voice to a server.
>>
>>It would be interesting to know your thinking around:
>>- how do you define the media format of the stream to the server? (codec, framing, ...)
>>- what kind of transport for the stream are you considering (http, WS, ...)?
>>
>>I think the first question is very relevant to RTC-Web as well, and we also put out a question on the WhatWG list on how to select the format for StreamRecorder (http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2010-November/029069.html).
>>
>>Br,
>>Stefan