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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Sep 2018 14:00:31 -0000 --_000_AM4PR07MB33960B900E6E2886ABEB9FDDC2010AM4PR07MB3396eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Gentlepeople! The SCReAM implementation found at https://github.com/EricssonResearch/scre= am now implements https://tools.ietf.org/html/draft-ietf-avtcore-cc-feedbac= k-message-02 Really hope that I got everything right General impressions: 1 The overhead increases a bit as compared to the previous proprietary form= at, it should not cause too much headache at high media rates but can be a = concern over low bitrate links , see https://github.com/EricssonResearch/sc= ream#feedback-format for a few ballpark numbers. I will later see if one ca= n lower the feedback rate or the ACK range. 2 The ACK range is 64 RTP packets, in the absence of packet loss in the fee= dback path this is a bit overkill, for SCReAM it should suffice with a 16 b= it ACK range, there is a certain risk of false loss detection with a reduce= d ACK range however. 3 I changed the internal time base in the code to 32 bit unsigned Q16 varia= ble, If I understand things this should reflex the middle 32 bits in the 64= bit NTP time stamp. The time base was earlier a 64 bit time in microseconds= , this change remove a lot of messy conversions and hopefully a few potenti= al bugs. /Ingemar =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D Ingemar Johansson M.Sc. Master Researcher Ericsson Research Network Protocols & E2E Performance Labratoriegr=E4nd 11 971 28, Lule=E5, Sweden Phone +46-1071 43042 SMS/MMS +46-73 078 3289 ingemar.s.johansson@ericsson.com www.ericsson.com Between the wish and the thing the world lies waiting. Cormac McCarthy =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D --_000_AM4PR07MB33960B900E6E2886ABEB9FDDC2010AM4PR07MB3396eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Gentlepeople!

 

The SCReAM implementation found at https://github.com/EricssonResearch/scream now implements https://tools.ietf.org/html/draft-ietf-avtcore-cc-feedback-message-02 <= o:p>

Really hope that I got everything right <= /p>

 

General impressions:

1 The overhead increases a bit as compared to the pr= evious proprietary format, it should not cause too much headache at high me= dia rates but can be a concern over low bitrate links , see http= s://github.com/EricssonResearch/scream#feedback-format for a few ballpa= rk numbers. I will later see if one can lower the feedback rate or the ACK = range.

 

2 The ACK range is 64 RTP packets, in the absence of= packet loss in the feedback path this is a bit overkill, for SCReAM it sho= uld suffice with a 16 bit ACK range, there is a certain risk of false loss = detection with a reduced ACK range however.

 

3 I changed the internal time base in the code to 32= bit unsigned Q16 variable, If I understand things this should reflex the m= iddle 32 bits in the 64bit NTP time stamp. The time base was earlier a 64 b= it time in microseconds, this change remove a lot of messy conversions and hopefully a few potential bugs. &nbs= p;

 

/Ingemar

=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D

Ingemar Joh= ansson  M.Sc.

Master Researcher<= /o:p>

 

Ericsson Research<= /o:p>

Network Protocols &= E2E Performance

Labratoriegr=E4nd 11

971 28, Lule=E5, Sweden=

Phone +46-1071 4304= 2

SMS/MMS +46-73 078 = 3289

ingemar.s.joh= ansson@ericsson.com

www.ericsson.com

 

 =         Between the wish and the thing

 =             &nb= sp; the world lies waiting.
            &nb= sp;    Cormac McCarthy
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D

 

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