[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [MMUSIC] WGLC on draft-ietf-mmusic-rfc4756bis-03

Hi  Ali,

Ali C. Begen (abegen) wrote: 
Now, this sounds different than the first scenario you described above, IMO. And, this leads to the original SDP you gave:

a=group:FEC-XR SB RB
a=group:FEC-XR SB SE RB RB+E

You are right, RB and RB+E are meant to be additive with respect to SB+SE.


  

    
section 4.1:

"Repair flows that are in different FEC groups are non-
   additive.".
    

  

  

Why would it be contrary? Here, RB and RB+E are in the same line and that is enough to state their additivity. But, in this scenario, their joint decoding helps the group of SB+SE. The above SDP says if the source consists of SB only, then just use RB only since RB+E would not help with decoding.
 
  

  

    
If the signaling in the example above is in line with the intention of
the draft, I would make the following modifications:

- You may add an "...exclusively in different FEC groups..." to the
sentence of section 4.1 above.
    

  

  

We can add this to make it stronger. But, I believe if two repair flows are additive in a group, it does not mean that they will also be additive in any other group where one of the source flows they protect is listed.
  





I think this makes the text clearer, at least to me.





  
Agree?

  

  

    
- Further, I would add the following text to section 4.1 to make it clearer:

"In order to express multiple relations between source and repair flows,
source and repair flows may appear in more than one FEC group."
    

  

  

I believe this was clear, but it is a good suggestion.
  





Good





  
 
  

  

    
I think the same should be valid for the FEC-SSRC grouping.
    

  

  

Sure.

Thanks for the review. Let me know if you agree with the above.
  





Thanks for the clarifications. I am ok with the changes and the
resulting draft.



Thomas





  
Cheers, acbegen.

 
  

  

    
Best regards,
Thomas


--
Thomas Schierl
--------------
Fraunhofer HHI



Jean-Francois Mule wrote:
    

    

      
This is to start a 2-week working group last call on draft
draft-ietf-mmusic-rfc4756bis-03,
http://tools.ietf.org/html/draft-ietf-mmusic-rfc4756bis-03.  The comment
period will end on Wednesday October 28.

Please send your comments to the mmusic list and the authors.

Thank you,
Jean-Francois.


_______________________________________________
mmusic mailing list
mmusic at ietf.org
https://www.ietf.org/mailman/listinfo/mmusic



      

    

    

    

  

  


  






-- 
Thomas Schierl
--------------
Fraunhofer HHI