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RE: [MEDIA_PIPELINE_TF] Adaptive Bit Rate Architectur

From: Jan Lindquist <jan.lindquist@ericsson.com>
Date: Mon, 12 Dec 2011 09:33:02 +0100
To: Clarke Stevens <C.Stevens@cablelabs.com>, "public-web-and-tv@w3.org" <public-web-and-tv@w3.org>
Message-ID: <82276AE38FD87A4C9CF6C820AC5276EA358FB8C15F@ESESSCMS0362.eemea.ericsson.se>
Hello,

I have a couple of questions on the proposal.

1. segment definition
Can a definition of segment be added to the proposal? It will help go over the below comments.

2. maxLevel (input)
What is the format of the input. Is it a segement identifier or bandwidth? If it is agreeable I would recommend to adopt concept of bandwidth that is mapped to the manifest bandwidth. Even though the bandwidth is a subjective level based on what is reported in the manifest rather than actual it is the best form to indicate a max limit. An extra argument could also be included indicating what position that this max level should be applied. An issue for implementers is that simply indicating max level may have different effects depending on how the buffer is handled. If this can be done at a future position it will make for a smoother transition.

3. callback change in representation
I am missing a callback reporting when the representation has changed. It might be what is called segment in the proposal but I am not sure. This callback is only reported when the "bandwidth" has changed. The "position" at which this change occurs should also be included since it may occur in a future point.

Regards,
JanL 

-----Original Message-----
From: Clarke Stevens [mailto:C.Stevens@cablelabs.com] 
Sent: den 9 december 2011 20:01
To: public-web-and-tv@w3.org
Subject: [MEDIA_PIPELINE_TF] Adaptive Bit Rate Architectur

Please take a look at the Wiki page for Adaptive Bit Rate.

http://www.w3.org/2011/webtv/wiki/MPTF/ADR_Error_Codes

I'd like to have a good list of parameters, and errors (for model 1 in
particular) that we can provide for MPTF folks to review over the next view days. You can make suggested edits directly, or post your ideas to the reflector.

Also, please make sure we are in agreement on the definitions of the architectural models.

Thanks,
-Clarke
Received on Monday, 12 December 2011 08:33:39 UTC

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