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Re: Summary of replace track status

From: Stefan Håkansson LK <stefan.lk.hakansson@ericsson.com>
Date: Fri, 29 May 2015 12:53:35 +0000
To: Shijun Sun <shijuns@microsoft.com>, Bernard Aboba <Bernard.Aboba@microsoft.com>, Peter Thatcher <pthatcher@google.com>, "Adam Roach" <adam@nostrum.com>
CC: "public-webrtc@w3.org" <public-webrtc@w3.org>
Message-ID: <1447FA0C20ED5147A1AA0EF02890A64B1D2425DC@ESESSMB209.ericsson.se>
On 27/05/15 22:37, Shijun Sun wrote:
> On Wednesday, May 27, 2015 3:29 AM Stefan Håkansson LK
> [mailto:stefan.lk.hakansson@ericsson.com] wrote:
>>> On 26/05/15 22:50, Bernard Aboba wrote: [BA] Looking through the
>>> Media Capture specification, I do not see mention of a track
>>> having an encoding constraint or codec attribute. Can you point
>>> out to me where this is described?
>> It is not described. I tried to clarify the use case described by
>> Adam in
>> https://lists.w3.org/Archives/Public/public-webrtc/2015May/0130.html
>>I think it is valid, don't you agree?
> Based on my knowledge of the media capture design, the captured data
> format is a device/platform internal decision, for example, whether
> the video data are uncompressed (e.g. RGB, YUV 420, etc.) or
> compressed (MJPEG is typical).  It is up to the browser/platform
> implementation to make sure to be able to internally consume the
> streams by the consumer objects.  In case of the RtpSender object, it
> can be an internal logic/implementation as to how to consume the data
> accordingly based on the encoding params.  In practice, it is very
> likely we have to re-encode (or transcode) anyway to meet the
> networking bandwidth condition, error recovery, etc. - all based on
> the encoding params and the RTP runtime decision.
> Please let me know if I'm missing anything.  Thanks!

I don't think you have missed anything. But the question is if we should 
exclude the use of camera codecs that are not supported by the platform, 
to me that seems like a limitation we should not do.

Received on Friday, 29 May 2015 12:54:03 UTC

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